Journals >Piezoelectrics & Acoustooptics
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2020
Volume: 42 Issue 6
33 Article(s)
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Design of Phased Array Focused Ultrasound Control System
WANG Huan, ZHANG Qing, ZHOU Hongsheng, PAN Hailin, and LIU Xiaoyi
The low intensity focused ultrasound treatment technology is a research hotspot in the field of ultrasound treatment. Different application scenarios have different requirements for parameters and performance of the ultrasound system, while the introduction of phased array technology brings new ideas to solve the problThe low intensity focused ultrasound treatment technology is a research hotspot in the field of ultrasound treatment. Different application scenarios have different requirements for parameters and performance of the ultrasound system, while the introduction of phased array technology brings new ideas to solve the problem of accurate control of the focused sound field. The output parameters of the existing phased array focused ultrasound control system are relatively fixed, the adjustable range of frequency and power is narrow, and the scale of supporting the transducer array channel is small. This paper presents a 256 channels phased array ultrasound control system based on FPGA. The experimental results show that the frequency of the system can be adjusted from 1 MHz to 3 MHz, the peak to peak value of the voltage is continuously adjustable within ±100 V, and the control precision of phase controlled delay is 5 ns. It can drive phased array probes with different array elements, so as to provide diversified incentive schemes for the research of ultrasonic therapy technology..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 735 (2020)
Effect of Static Electric Field on SAW Propagation in Piezoelectric Films
LIU Zhirong, XIE Liqiang, ZHU Min, and BAO Wenqi
The effect mechanism of static electric field on the propagation of surface acoustic wave(SAW) in piezoelectric film is discussed. Firstly, the initial stress and the initial displacement of piezoelectric film in static electric field are deduced. Secondly, the phase velocity change and the dispersion curve of SAW are The effect mechanism of static electric field on the propagation of surface acoustic wave(SAW) in piezoelectric film is discussed. Firstly, the initial stress and the initial displacement of piezoelectric film in static electric field are deduced. Secondly, the phase velocity change and the dispersion curve of SAW are obtained by solving the coupling wave equation of piezoelectric medium. Finally, the propagation characteristics of SAW in ZnO and AlN piezoelectric films are simulated and analyzed. The results show that the phase velocity of SAW is proportional to the magnitude of static electric field and inversely proportional to the magnitude of wave number..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 739 (2020)
Design of Triple-band Bandpass Filter Based on Fan-shaped Substrate Integrated Waveguide
ZHANG Sheng, LIU Shuo, and XIE Zhenjiang
In this paper, a 60° fan-shaped substrate integrated waveguide resonator is proposed, and then a row of metal vias are loaded into the structure to perturb its TM110, TM210 and TM120 modes. Finally, a compact triple-band bandpass filter based on the 60° fan-shaped substrate integrated waveguide resonator is dIn this paper, a 60° fan-shaped substrate integrated waveguide resonator is proposed, and then a row of metal vias are loaded into the structure to perturb its TM110, TM210 and TM120 modes. Finally, a compact triple-band bandpass filter based on the 60° fan-shaped substrate integrated waveguide resonator is designed by using the disturbed field mode. The frequency selection characteristic of the filter is improved by introducing a complementary split-ring resonators and source-load coupling structure. The center frequencies of the three passbands are 5.61 GHz, 7.41 GHz, and 8.77 GHz respectively, and the 3 dB bandwidths are 148 MHz, 298 MHz, and 347 MHz respectively. The measured results of the filter are in good agreement with that of the simulation..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 743 (2020)
Design of Segmented Loop Antenna for Surface Acoustic Wave Torque Measurement System
XIONG Zhiqiang, CHEN Zhijun, SUN Cong, ZHU Weijun, and GUO Jiajia
The antenna design is an important part for realizing wireless and passive surface acoustic wave torque measurement. The segmented loop antenna of the reader is designed for the rotating shaft structure of the torque to be measured, and the three-dimensional electromagnetic simulation software HFSS is used to simulate The antenna design is an important part for realizing wireless and passive surface acoustic wave torque measurement. The segmented loop antenna of the reader is designed for the rotating shaft structure of the torque to be measured, and the three-dimensional electromagnetic simulation software HFSS is used to simulate the center frequency, bandwidth, input impedance, and directivity pattern. On the basis of simulation and optimization, the segmented loop antenna is fabricated and tested. The measurement results show that the center frequency of the antenna is 431.6 MHz, the bandwidth is 424~440 MHz, the input impedance is close to 50 Ω, and the plane where the antenna is located has good omni-directionality. The surface acoustic wave torque measurement system including the reader antenna can realize accurate torque measurement, and the full-scale error is 2.5% from -80 N·m to 80 N·m..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 747 (2020)
The Influence of Cladding Layer Thickness on Surface Wave Focusing Characteristics of Phased Array
ZHOU Yongli, ZHOU Gang, HU Hongwei, and LIU Zhiping
The ultrasonic surface wave is an important method to detect the quality of laser cladding layer. In order to improve the detection resolution, the phased array surface wave which can achieve the focusing effect of acoustic beam is used to detect laser cladding layer. Firstly the finite element model of surface wave prThe ultrasonic surface wave is an important method to detect the quality of laser cladding layer. In order to improve the detection resolution, the phased array surface wave which can achieve the focusing effect of acoustic beam is used to detect laser cladding layer. Firstly the finite element model of surface wave propagation between single probe and phased array is established. Subsequently, the ultrasonic wave propagation path is studied based on the Fermat principle and the delay characteristics of the array elements. The focusing and deflection of the phased array surface wave are realized, and the influence of the thickness of the cladding layer on the focusing characteristics of the phased array surface wave is studied. The results show that when the base material is aluminum and the cladding layer material is 45# steel, the thickness of the cladding layer is within 2.5 mm, and the energy of the focal point decreases with the increase of thickness. Especially, the energy of the focal point decreases by 58.8% with the thickness of 1 mm compared to 0.2 mm. When the thickness is greater than 2 mm, the energy changes little at the focus point, indicating that the ultrasonic phased array surface wave has a good detection effect on the thin cladding layer..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 752 (2020)
Study on Acoustic Field Simulation of Broadband Acousto-optical Devices
WU Zhongchao, TANG Shi, WU Wei, GAO Weisong, ZHU Ji, and WANG Zhilin
According to the Helmholtz-Kirchoff integration theorem, the acoustic field distribution models of two rectangular transducers in acousto-optic crystal are established in this paper. The acoustic field of rectangular transducers with center frequency of 100 MHz in the tellurium dioxide crystal is simulated numerically According to the Helmholtz-Kirchoff integration theorem, the acoustic field distribution models of two rectangular transducers in acousto-optic crystal are established in this paper. The acoustic field of rectangular transducers with center frequency of 100 MHz in the tellurium dioxide crystal is simulated numerically and visualized by means of MATLAB. The results show that compared with the acoustic field distribution of the single transducer, the Bragg bandwidth of the acousto-optic device is increased by 11 MHz using the structure of the two transducers. The simulation results can be a theoretical basis for understanding the acoustic field change produced in testing medium and judgment for testing performance..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 757 (2020)
Crystal Filter with High Fundamental Frequency and High Electromechanical Coupling Coefficient
PENG Shengchun, ZHAO Ruixing, YANG Hao, QIU Zelin, LI Yafei, WEN Zhiru, TANG Ping, and DONG Shu
The lithium tantalate crystal material was etched by the ion etching process, and an inverted-mesa structure wafer was obtained, the thickness of which was about 31.3 μm, which can be used to fabricate high fundamental frequency crystal resonators. A high frequency broadband crystal filter with a center frequency of 63The lithium tantalate crystal material was etched by the ion etching process, and an inverted-mesa structure wafer was obtained, the thickness of which was about 31.3 μm, which can be used to fabricate high fundamental frequency crystal resonators. A high frequency broadband crystal filter with a center frequency of 63 MHz, 3 dB bandwidth of 780 kHz, stopband attenuation of greater than 75 dB and the operating temperature of -55 to +95 ℃ is designed by using the fabricated resonator and the differential bridge circuit in the circuit. The experimental results show that the upper limit of the operating frequency of the crystal filter can be greatly increased by using the ion beam etching process..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 761 (2020)
Research on Damage Detection of Heat-insulating Structure Based on Distributed Optical Fiber Sensor
LIU Minjing, XIA Zixu, LI Jianle, WU Zhanjun, and GAO Dongyue
The anti-thermal insulation structures are widely used in engineering, and their health status is very important to structural safety. In order to monitor the health status of thermal insulation bonded structure, a method for damage identification and monitoring of thermal adhesive structures based on distributed opticThe anti-thermal insulation structures are widely used in engineering, and their health status is very important to structural safety. In order to monitor the health status of thermal insulation bonded structure, a method for damage identification and monitoring of thermal adhesive structures based on distributed optical fiber sensors is proposed in this paper. First of all, the process of the damaged specimens under bending load is numerical simulated by the finite element method. The strain trend of the de-bonding and cracked specimens is determined by the simulated strain results, which can be used as the classification foundation to determine the structure failure. The experiment on the specimens with de-bonding and crack defects is carried out to identify and locate the damage location. The search results show that the de-bonding and crack damage can be judged according to the strain trend of the structure under loading, so as to realize the structure health monitoring..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 765 (2020)
Single Polarization Fiber Acousto-Optic Modulator
WU Wei, TANG Shi, WANG Zhilin, LINGHU Mei’ao, ZHU Ji, and FU Lipeng
The design and application of an all-fiber coupled single polarization acousto-optic modulator is introduced in this paper. The working principle of the fiber acousto-optic modulatoris analyzed theoretically, and the design methods of the key indicators including insertion loss, extinction ratio, rise time of light pulThe design and application of an all-fiber coupled single polarization acousto-optic modulator is introduced in this paper. The working principle of the fiber acousto-optic modulatoris analyzed theoretically, and the design methods of the key indicators including insertion loss, extinction ratio, rise time of light pulse and the coupling process method of single polarization fiber collimatorsare presented. A single polarization fiber acousto-optic modulatorworking at a wavelength of 1.06 μm with high speed and low insertion loss is designed and manufactured. The polarization extinction ratio (PER) reaches 42 dB, which effectively isolates the polarization noise of the system..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 769 (2020)
Study on Band Gap Regulation of Phononic Crystal Rod with Piezoelectric Shunting
ZHANG Yaru, GUO Hui, YUAN Tao, SUN Pei, WANG Yansong, and CHENG Qian
Owing to the property of elastic wave band gap, the piezoelectric phononic crystals have been used for noise and vibration control. In this paper, a piezoelectric phononic crystal rod structure is constructed by periodically arranging a piezoelectric shunt unit with negative capacitance on the epoxy resin rod. In orderOwing to the property of elastic wave band gap, the piezoelectric phononic crystals have been used for noise and vibration control. In this paper, a piezoelectric phononic crystal rod structure is constructed by periodically arranging a piezoelectric shunt unit with negative capacitance on the epoxy resin rod. In order to expand the wide band gap, three cell configurations are designed for this structure, the transfer matrix method is used to calculate the band gap characteristics, and the genetic algorithm is used to optimize the shunt circuit parameters. The theoretical and simulation results show that by changing the number of piezoelectric shunt units with different resonance frequencies in the cell, multiple local resonance band gaps can be obtained, and the band gap tunability can be enhanced. By using the algorithm optimization, the best matching of the shunt circuit parameters can be obtained when the band gap is tuned, and the combination of multiple bandgaps can be realized and the wide band gap can be expanded without changing the original structure..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 772 (2020)
Model Modification for Cantilever Piezoelectric Energy Harvester
GUO Li, ZHOU Xingde, and YANG Jing
In this paper, the cantilever piezoelectric energy collector is taken as the research object, aiming at the problem that there existed a deviation of the velocity frequency response function(VFF) of the distributed parameter model derived by Erturk in the range of 0~20 Hz during the simulation, a VFF modification methoIn this paper, the cantilever piezoelectric energy collector is taken as the research object, aiming at the problem that there existed a deviation of the velocity frequency response function(VFF) of the distributed parameter model derived by Erturk in the range of 0~20 Hz during the simulation, a VFF modification method is proposed in this paper. First, the derivation of the velocity frequency response function with a tip mass of the distributed parameter model is introduced. Then through the simulation and analysis of VFF in the range of 0~20 Hz, it is found that the reason for the main error is the first term of VFF expression, thus the sine function with parameter α introduced to reduce the error. Considering that the introduction of the sine function led to the error of the second term of VFF, the tangent function with parameter β was introduced to reduce the error. Finally, the optimal range of α and β was determined by error analysis, and an example is analyzed. The results show that the velocity frequency response of the modified distributed parameter model is consistent with the experimental results..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 777 (2020)
Optical Fiber Quasi-distributed Hydrogen Leakage Monitoring Based on Φ-OTDR
LI Shudong, SU Yang, HE Guangceng, ZHU Yupei, PENG Wenying, GONG He, YANG Yongji, WU Taojiang, and WU Dechao
To effectively monitor the hydrogen leakage of hydrogen pipeline, a quasi-distributed real-time online hydrogen leakage monitoring system based on -OTDR is proposed in this paper. First, the cladding of the single-mode fiber was removed, and then the hydrogen-sensitive palladium film was coated on the surface of fiber To effectively monitor the hydrogen leakage of hydrogen pipeline, a quasi-distributed real-time online hydrogen leakage monitoring system based on -OTDR is proposed in this paper. First, the cladding of the single-mode fiber was removed, and then the hydrogen-sensitive palladium film was coated on the surface of fiber without cladding by using the chemical coating method to response the hydrogen, thereafter, the hydrophobic sol was coated on the palladium film. Second, the hydrophobic sol coated fiber was installed in the PTFE channel. Finally, the hydrogen leak of the hydrogen pipeline was monitored by using the Φ-OTDR distributed hydrogen sensing system. The results show that the optical fiber Φ-OTDR distributed hydrogen sensing system can accurately respond to small changes in hydrogen concentration around the hydrogen pipeline. The response time was 60 s, the position resolution was 50 mm, and the lower limit of detection for hydrogen concentration was 1 000×10-6. The research results show that the measurement system based on optical fiber Φ-OTDR can accurately detect hydrogen leaks in hydrogen pipelines over a long distance and large range..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 782 (2020)
Research on Low Temperature Sensing Characteristics of Fiber Bragg Grating
LI Bowen, LIU Yinggang, SONG Xiaoya, FU Haiwei, JIA Zhen’an, and GAO Hong
In order to solve the application problem of fiber grating in low temperature environment, based on the sensing theory of fiber Bragg grating(FBG), through in-depth analysis of the changes of the thermo-optical coefficient and thermal expansion coefficient of FBG at the range of -60~25 ℃, and two unsealed FBGs is used In order to solve the application problem of fiber grating in low temperature environment, based on the sensing theory of fiber Bragg grating(FBG), through in-depth analysis of the changes of the thermo-optical coefficient and thermal expansion coefficient of FBG at the range of -60~25 ℃, and two unsealed FBGs is used for experimental verification, the response of FBG in low temperature environment is obtained in this paper. The results show that FBG has good response and repeatability in low temperature environment, which has important guiding significance for the application of FBG in low temperature environment..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 787 (2020)
Study on Photoluminescence Heating and Spectral Beam Splitting Utilizing Optical Fiber
JIN Yue, WU Taojiang, LI Yujie, and WU Dechao
The LaB6-SiO2-Canadian resin sols with different doping content of LaB6 were prepared by using the lanthanum hexaboride(LaB6) nanomaterials, Canadian resin sol and nano-SiO2, and then coated on the surface of plastic optical fiber to form a photoluminescence heating and spectral beam splitting utilizing optical fiber. The LaB6-SiO2-Canadian resin sols with different doping content of LaB6 were prepared by using the lanthanum hexaboride(LaB6) nanomaterials, Canadian resin sol and nano-SiO2, and then coated on the surface of plastic optical fiber to form a photoluminescence heating and spectral beam splitting utilizing optical fiber. The absorption spectrum and heating rate of LaB6 particles were tested, and the effects of the doping content of LaB6 and the thickness of the coating layer on the luminous heating performance of the fiber surface were investigated. The results showed that the LaB6 exhibited weak absorption at the wavelength of 510~650 nm for light radiation, while exhibited strong absorption for light at other visible-near infrared bands for heat generation. When the mass fraction of LaB6 is 0.30% and the coating thickness is 200 μm, the uniformity of photoluminescence heating on the surface of optical fiber is the best, and the average luminous intensity and average heating rate of the observation points reach 26.59 μW/cm2 and 0.29 ℃/min, respectively, and realizes the utilizing of spectral beam splitting in the visible-near infrared spectrum..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 791 (2020)
Elevator Health Monitoring System Based on Fiber Bragg Grating Sensor Network
WU Taojiang, YU Xiaoyi, ZHANG Chunjuan, YIN Jingsong, and SHI Shenghui
A quasi-distributed fiber optic sensor network based on fiber Bragg grating(FBG) sensor is proposed in order to solve the problems of complicated sensor wiring and fast sensor degradation of the traditional health monitoring methods for large elevator steel frame structure. First, the basic principles of FBG stress andA quasi-distributed fiber optic sensor network based on fiber Bragg grating(FBG) sensor is proposed in order to solve the problems of complicated sensor wiring and fast sensor degradation of the traditional health monitoring methods for large elevator steel frame structure. First, the basic principles of FBG stress and temperature sensors are presented, and the overall scheme of FBG remote sensing and monitoring system with elevator steel frame structure by the method of “space division multiplexing + WDM” is constructed, the strain and displacement sensor array are designed, and the demodulation algorithm of FBG strain gauge and FBG displacement meter are investigated. Then, the actual model of the elevator steel frame structure was used to build the corresponding test system, the FBG strain gauge and FBG displacement meter are installed to test the distributed network, and the supporting health condition monitoring software of the elevator rigid structure is developed. The test results show that the proposed system can respond in real time with good stability. The system provides real-time monitoring data and safety warning functions for the safe operation of outdoor large vertical and diagonal elevators, and can provide big data support for “on-demand maintenance”..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 796 (2020)
Theoretical Analysis and Application Test of Piezoelectric Inertial Actuator
TIAN Xiaochao, WANG Haigang, WANG Hu, SUN Yuze, ZHU Jinzhi, WANG Zhicong, and YANG Zhigang
In order to explore the output performance of the piezoelectric actuator and improve the performance of the piezoelectric driving mechanism, this research has conducted theoretical analysis and application test of the cross shaped piezoelectric inertial actuator. Firstly, the driving mechanism and structure compositionIn order to explore the output performance of the piezoelectric actuator and improve the performance of the piezoelectric driving mechanism, this research has conducted theoretical analysis and application test of the cross shaped piezoelectric inertial actuator. Firstly, the driving mechanism and structure composition of the actuator were presented; then the expressions of the elastic vibration displacement were obtained according to the elastic mechanics analysis of the actuator and the factors that affect the performance of the actuator were determined. Finally, the experimental tests of the actuator were implemented, in which the actuator was used to drive the flexible braille dot display device. The results indicated that the actuator had good work capability, obvious protrude of the flexible film bumps. The results showed that the actuator can effectively drive the system and amplify the output displacement of the flexible film bumps, and the flexible film contact protrudes obviously and has good performance. Thus, the research indicated that it is feasible and effective to drive system by using the piezoelectric inertial actuator..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 800 (2020)
Study on the Performance of a Novel Ce∶GAGG Scintillation Detector
WANG Lu, WANG Qiang, QU Jingjing, DONG Honglin, FANG Chengli, and DING Yuchong
In this work, a new Ce∶GAGG scintillation crystal is coupled with the CR-173 photomultiplier tube, and then is packaged in an aluminum alloy shell together with voltage divider circuit, high voltage module and preamplifier circuit to fabricate a novel Ce∶GAGG scintillation detector. The effects of different sizes of CeIn this work, a new Ce∶GAGG scintillation crystal is coupled with the CR-173 photomultiplier tube, and then is packaged in an aluminum alloy shell together with voltage divider circuit, high voltage module and preamplifier circuit to fabricate a novel Ce∶GAGG scintillation detector. The effects of different sizes of Ce∶GAGG scintillation crystals, different coupling modes and different reflective layer packaging materials on the light yield and energy resolution of the Ce∶ GAGG scintillation detector are studied, at the same time, it is compared with the packaged 1 inch (1 inch=2.54 cm) thallium doped sodium iodide (NaI(Tl)) scintillation crystal, and the energy linearity of Ce∶GAGG and NaI(Tl) scintillation detectors is measured. The experimental results show that the small size of Ce∶GAGG scintillation detector has the best performance;the optical silicone coupling can significantly improve the performance of the scintillation detector; the enhanced specular reflector (ESR) material packaging scintillation detector has the best performance; the performance of Ce∶GAGG scintillation detector is better than NaI(Tl) scintillation detector..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 806 (2020)
Study on Preparation and Properties of SnO2 Varistor Ceramics Doped with MnO2
LIANG Wenxin, ZHAO Hongfeng, KANG Jiashuang, WANG Hao, ZHOU Yuanxiang, and XIE Qingyun
The SnO2-ZnO-Ta2O5 based varistor ceramics was prepared by partial replacement of ZnO with MnO2. The effects of Zn and Mn co-doping on the microstructure and electrical properties of SnO2 were investigated. The experimental results showed that the substitution of ZnO with a small amount of MnO2 could improve the nonlinThe SnO2-ZnO-Ta2O5 based varistor ceramics was prepared by partial replacement of ZnO with MnO2. The effects of Zn and Mn co-doping on the microstructure and electrical properties of SnO2 were investigated. The experimental results showed that the substitution of ZnO with a small amount of MnO2 could improve the nonlinear performance of the samples and significantly increase the voltage gradient. When the MnO2 doping amount was 0.25%, the nonlinearity of the sample reaches 21.37, the voltage gradient was 422 V/mm, and the leakage current was 72.12 μA/cm2. The main reason for the change was that Mn supplements the original insoluble portion of ZnO in the SnO2 lattice, and undergoes the solid solution reaction to generate the acceptor defect ion Mn″Sn, which promotes the formation of the potential barrier. At the same time, Mn has low solubility in SnO2 lattice, so it was easy to segregate and precipitate on grain boundary layer, which hinders grain growth and increases voltage gradient..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 810 (2020)
Effects of LiF/Li2CO3 on the Sintering Behavior and Piezoelectric Properties of PZT Ceramics
ZHAO Shiyan, and HU Wangfeng
The Pb(Zr0.52Ti0.48)O3+x%LiF/Li2CO3(PZT+x%LiF) and Pb(Zr0.52Ti0.48)O3+y%Li2CO3(PZT+y%Li2CO3) (x and y are the mass fractions) piezoelectric ceramics were prepared by solid state process in this paper. The effects of different x and y on the sintering behavior, crystal structure, microstructure and piezoelectric propertThe Pb(Zr0.52Ti0.48)O3+x%LiF/Li2CO3(PZT+x%LiF) and Pb(Zr0.52Ti0.48)O3+y%Li2CO3(PZT+y%Li2CO3) (x and y are the mass fractions) piezoelectric ceramics were prepared by solid state process in this paper. The effects of different x and y on the sintering behavior, crystal structure, microstructure and piezoelectric properties of PZT ceramics have been investigated. With the increase of x and y, the tetragonal phase cell ratio (c/a) of PZT piezoelectric ceramics decreases, but when x is equal to y, the c/a of PZT+x%LiF is smaller than that of PZT+y%Li2CO3, while the Curie temperature is basically unchanged, and the piezoelectric properties of PZT+x%LiF and PZT+y%Li2CO3 decrease after a small increase. The piezoelectric properties of LIF/Li2CO3 and PZT+y%Li2CO3 are the best when x=y=0.2. The results show that the addition of LiF/Li2CO3 can promote the low temperature sintering and increase density; at a sintering temperature of 1 100 ℃, the properties of Li2CO3 samples are better than that of LiF, and the low-temperature sintering effect is better, but at a more amount of doping amount, LiF has less effect on the property deterioration..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 814 (2020)
Influences of Nb5+ Doping on Structure and Electric Properties of (Ca0.97Ba0.03)Cu3Ti4O12 Ceramics
HU Jiandong, ZHONG Xin, MIN Liang, LIU Yong, GU Junjie, HU Taolin, CHANG Xiangle, and ZHANG Chen
The (Ca0.97Ba0.03)Cu3Ti4-xNbxO12(x=0, 0.01, 0.03, 0.05, 0.07, 0.10, 0.15, 0.20) ceramics have been prepared by the solid state reaction method. The influences of the mole fraction of Nb5+ on the phase structure and surface micromorphology of (Ca0.97Ba0.03)Cu3Ti4O12 ceramics have been investigated using the X-ray diffraThe (Ca0.97Ba0.03)Cu3Ti4-xNbxO12(x=0, 0.01, 0.03, 0.05, 0.07, 0.10, 0.15, 0.20) ceramics have been prepared by the solid state reaction method. The influences of the mole fraction of Nb5+ on the phase structure and surface micromorphology of (Ca0.97Ba0.03)Cu3Ti4O12 ceramics have been investigated using the X-ray diffractometer and scanning electron microscope. The variations of the electric properties of the (Ca0.97Ba0.03)Cu3Ti4-xNbxO12 ceramics are obtained by the high and low temperature dielectric performance test system and impedance tester. The results show that the (Ca0.97Ba0.03)Cu3Ti4-xNbxO12 ceramics of various components are single-phase cubic perovskite structure. With the increase of the mole fraction of Nb5+, the grain growth of (Ca0.97Ba0.03)Cu3Ti4-xNbxO12 ceramics can be inhibited effectively and the abnormal grain growth is eliminated. The grain boundary resistance of (Ca0.97Ba0.03)Cu3Ti4-xNbxO12 ceramics can be effectively increased by appropriately doping Nb5+, thus its dielectric loss can be reduced, and the temperature stability of the relative dielectric constant of (Ca0.97Ba0.03)Cu3Ti4-xNbxO12 ceramics can also be improved..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 820 (2020)
Design and Finite Element Analysis of Piezoelectric Torsional Actuator with Spiral Electrode
GUO Quanyuan, LIU Yonggang, ZENG Aoke, and YAN Pengfei
A new piezoelectric torsional actuator with the structure of spiral electrode based on the interdigital electrode (IDE) was designed, and the theoretical equation of strain for points in the effective electrode region of spiral electrode plane is derived and established. The theoretical equation was verified through thA new piezoelectric torsional actuator with the structure of spiral electrode based on the interdigital electrode (IDE) was designed, and the theoretical equation of strain for points in the effective electrode region of spiral electrode plane is derived and established. The theoretical equation was verified through the analysis software ABAQUS, and the influences of voltage, radial dimension and disk thickness on the strain of the piezoelectric actuator were studied. The results show that the piezoelectric torsional actuator with spiral electrode can produce large tangential strain and radial strain output, increasing the voltage and reducing the radial size and thickness of the piezoelectric disc are beneficial to improve the driving performance of the actuator. The tangential strain of the piezoelectric torsional actuator with spiral electrode can reach 17.5 times and the radial strain is 1.6 times that of the common electrode when the spiral angle, the radial size of the piezoelectric disc and the voltage are fixed..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 825 (2020)
Study on Planar Motor Driven by Basin-shaped Piezoelectric Vibrator in Homo-mode
WANG Zheyi, HE Honglin, FANG Zhimin, and WU Xingqiang
In order to meet the needs of high-precision plane motion, a basin-shaped plane ultrasonic motor is proposed in this paper. The anti-symmetric longitudinal stretching vibration, the first-order bending vibration in the plane of the left and right square bars, and the first-order bending vibration modes of the front andIn order to meet the needs of high-precision plane motion, a basin-shaped plane ultrasonic motor is proposed in this paper. The anti-symmetric longitudinal stretching vibration, the first-order bending vibration in the plane of the left and right square bars, and the first-order bending vibration modes of the front and rear square bars are selected as the operating modes, and the longitudinal vibration mode and bending vibration mode composite to form the elliptical motion of xOz and yOz surfaces.The driving principle of the motor is presented in this paper. Based on ANSYS analysis software, the finite element model of stator is established, the structure size is optimized, the interference mode separation is realized, the harmonic response and transient analysis are carried out, and the motion regulation characteristics are analyzed. Based on the optimization of frequency consistency, the overall size of the basin-shaped stator is 53.136 mm×4.550 mm×4.560 mm, and the x, y and z-directional amplitudes on the stator driving foot are 2.0 μm, 1.49 μm, and 3.36 μm respectively. The elliptical motion trajectory is simulated, and the good motion characteristics of the planar motor are verified. The stator fixing method is given and the motor assembly structure is designed..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 831 (2020)
Current Progress of Integrated Lithium Niobate Photonic Device Technology
ZHANG Tao, HE Jie, HU Shaoqin, XU Xin, and ZHANG Yulei
Lithium niobate(LiNbO3) on insulator(LNOI) is a promising material for integrated photonics, owing to its unique properties of wide optical transparency window, high refractive index, large second order nonlinearity and large piezoelectric response. The integrated LN material, featuring sub-wavelength scale light confiLithium niobate(LiNbO3) on insulator(LNOI) is a promising material for integrated photonics, owing to its unique properties of wide optical transparency window, high refractive index, large second order nonlinearity and large piezoelectric response. The integrated LN material, featuring sub-wavelength scale light confinement and high integration of optoelectronic components, has the potential to enable higher performance, lower cost and entirely new devices and applications, and revolutionize optical communication and microwave photonics. This review focusses on the current progress of LNOI electro-optic modulator, LNOI acousto-optic(AO) modulator and LNOI electro-optic frequency comb, and briefly discusses the challenges meeting from fabrication and system realization..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 837 (2020)
Modeling of Piezoelectric Hysteresis Based on Interval Type-2 T-S Fuzzy System
CHEN Shengxin, ZHAO Xinlong, SU Qiang, and SU Liangcai
In order to identify the inherent hysteresis characteristic of the piezoelectric actuator, a modeling scheme based on the interval type-2 Takagi-Sugeno(T-S) fuzzy system is proposed in this paper. First, the vertical distance formula is used to replace the traditional error calculation formula, so that the clustering aIn order to identify the inherent hysteresis characteristic of the piezoelectric actuator, a modeling scheme based on the interval type-2 Takagi-Sugeno(T-S) fuzzy system is proposed in this paper. First, the vertical distance formula is used to replace the traditional error calculation formula, so that the clustering algorithm is directly related to the identified regression plane results, and a modified interval type-2 fuzzy C-regression model(FCRM) clustering algorithm is proposed to divide the fuzzy space and improve the accuracy of interval division. Second, in view of the problem that the hyperspherical Gaussian membership function does not match the structure of the hyperplane clustering algorithm; the hyperplane membership function matching with the hyperplane is introduced to complete the identification of the fuzzy antecedent parameters, and the least square method is used to identify the fuzzy consequent parameters. Finally, the hysteresis characteristics of the piezoelectric actuator are modeled by using the above-mentioned scheme. The effectiveness of the proposed modeling method is verified by experiments..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 843 (2020)
Development of UAV Navigation System for Taking-off and Landing on Moving Platform Based on SINS/RTK
LI Xinghai, YAN Zhi’an, XU Liang, XU Changyan, LI Baolin, and GONG Qiao
In response to the requirements of high navigation accuracy, high calculation precision of the relative positioning between the UAV and the landing point on the moving platform, small size and light weight of the navigation system, a UAV navigation system for taking-off and landing on moving platform is developed basedIn response to the requirements of high navigation accuracy, high calculation precision of the relative positioning between the UAV and the landing point on the moving platform, small size and light weight of the navigation system, a UAV navigation system for taking-off and landing on moving platform is developed based on the strapdown inertial navigation(SINS), BEIDOU carrier phase differential technique (that is, the real-time kinematic technique, RTK) and the multi-source navigation information fusion technology based on Kalman filtering. The experimental results show that the accuracy of the navigation system of the geographical system is as follows, heading of less than or equal to 0.2°(σ is the square difference), attitude of less than or equal to 0.15°(1σ), horizontal positioning of less than or equal to 0.4 m (1σ), and altitude of less than or equal to 0.8 m (1σ); and the relative accuracy of the navigation system and the mobile reference station at dynamic conditions is as follows, horizontal positioning of less than or equal to 0.05 m(1σ), altitude of less than or equal to 0.1 m(1σ). The flight tests show that the proposed navigation system meets the navigation accuracy requirements of UAV’s taking off and landing on the moving platform..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 848 (2020)
Rapid Calibration Method of MIMU 24 Error Parameters Based on LABVIEW
LIU Zhiwei, CUI Min, ZHANG Peng, and XU Wenwu
Aiming at the problems of complicated calibration method, long calibration period and complicated calibration equipment of the conventional MIMU, a method quickly calibrating MIMU by controlling a small three-axis turntable by LABVIEW host computer is designed in this paper. First, the MIMU calibration model establisheAiming at the problems of complicated calibration method, long calibration period and complicated calibration equipment of the conventional MIMU, a method quickly calibrating MIMU by controlling a small three-axis turntable by LABVIEW host computer is designed in this paper. First, the MIMU calibration model established, the by constructing the Kalman filters of the gyroscope and accelerometer separately to reduce the amount of calculation and calibration time. By taking the attitude and speed of the small three-axis turntable as the reference to obtain the speed error and attitude error as the observation measurement and by controlling the three-axis turntable to rotate according to the designed calibration path through the LABVIEW host computer, collect the MIMU outputs are collected and the 24 error parameters of MIMU are estimated by using the Kalman filter sub-VI (sub-function of LABVIEW). The experimental results show that the method can realize the rapid calibration of the gyroscope and accelerometer in MIMU, and the accuracy of the installation error and constant drift is basically consistent with that of the conventional discrete calibration method, and the relative error of calibration factor is less than 0.006, and the calibration time is reduced from 3 h to 30 min..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 854 (2020)
Piezoelectric Energy Harvesting System Based on Imperfect Acoustic Black Hole
WANG Heng, TANG Rongjiang, ZHENG Weiguang, and WEN Yansheng
A piezoelectric array energy harvesting system based on imperfect acoustic black holes is proposed to solve the problem of low energy recovery efficiency of high frequency piezoelectric vibration. The thin plate structure model of the imperfect acoustic black hole is established, and the energy accumulation characterisA piezoelectric array energy harvesting system based on imperfect acoustic black holes is proposed to solve the problem of low energy recovery efficiency of high frequency piezoelectric vibration. The thin plate structure model of the imperfect acoustic black hole is established, and the energy accumulation characteristics in time domain and frequency domain are analyzed. The energy of the imperfect acoustic black hole structure is concentrated at several positions of the central platform. The experimental model of the piezoelectric array energy harvesting system is established. The output voltage of the energy gathering point on the central platform of the structure has a large phase difference, which is eliminated by introducing a rectifier circuit. The output voltage of the series and parallel circuits before and after rectification is compared and analyzed. The results show that the output voltage capability of the system has been greatly improved after rectification..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 859 (2020)
Development of SAW Devices on LN/LT- POI Multilayered Structure
HE Jie, MA Jinyi, HU Shaoqin, and XU Xin
The piezoelectric-on-insulator film structure material(POI) can provide a breakthrough solution approach and scheme for developing integrated SAW devices with high performance, which can meet the urgent needs of the integration, miniaturization, high frequency and wide bandwidth of the next generation of piezoelectric The piezoelectric-on-insulator film structure material(POI) can provide a breakthrough solution approach and scheme for developing integrated SAW devices with high performance, which can meet the urgent needs of the integration, miniaturization, high frequency and wide bandwidth of the next generation of piezoelectric acoustic devices under the development trend of RF front-end integration and miniaturization. In this paper, the fabricating technique of the POI. The latest research results of high performance SAW devices on LN/LT-POI structure are summarized, and its future development is prospected..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 864 (2020)
Influence of Gravity Field on Performance of Hemispherical Resonator Gyro
FANG Zhongqi, FANG Haibin, LEI Ting, TAN Pinheng, and HAN Shichuan
The hemispherical resonator gyro is the only vibratory gyro that can reach the accuracy of inertial navigation. The vibrational state of its resonator may change under the influence of external environmental conditions, making the output signal of gyro unstable. In order to study the sensitivity of the hemispherical reThe hemispherical resonator gyro is the only vibratory gyro that can reach the accuracy of inertial navigation. The vibrational state of its resonator may change under the influence of external environmental conditions, making the output signal of gyro unstable. In order to study the sensitivity of the hemispherical resonator gyro to the gravity fields in different directions, the mechanism of HRG’s signal output change caused by gravity field is analyzed. The dynamic simulation analysis of resonator in two dimensions of structure stiffness and anchor loss is carried out by using the finite element method(FEM), and corresponding tests are carried out to verify the analysis results. The results indicate that the gravity fields in different directions have no obvious effect on the performance of hemispherical resonator gyro..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 871 (2020)
Research Progress of Piezoelectric Ultrasonic Transducer with Wide Temperature Range
WANG Guoliang, LIU Xueliang, YU Fapeng, and ZHAO Xian
As an important nondestructive testing device, the piezoelectric ultrasonic transducers have been widely used in various fields of the national economy. With the development of modern industries, especially the aerospace, nuclear power plant and intelligent manufacture industries etc., various industrial and mining envAs an important nondestructive testing device, the piezoelectric ultrasonic transducers have been widely used in various fields of the national economy. With the development of modern industries, especially the aerospace, nuclear power plant and intelligent manufacture industries etc., various industrial and mining environments put forward higher requirements for the performance of piezoelectric transducers, so, it is urgently expected that the piezoelectric transducers can stably monitor the operation of equipment in a wide operational temperature range, giving early warning, and avoiding structural damage of important equipment. The piezoelectric ultrasonic transducer with wide operational temperature range is a frontier research content in the field of piezoelectric device technology. This paper focuses on the piezoelectric ultrasonic transducer and its structure than can operate in a wide temperature range, and describes the unique advantages of piezoelectric ultrasonic transducers in non-destructive detection..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 875 (2020)
Design of Low Noise Hemispherical Gyrofor Precise Orientation
FANG Haibin, HAN Shichuan, PENG Kai, LEI Ting, and ZHOU Chuang
The Hemispherical resonator gyro is a new kind of vibratory gyro with high precision and long life. In order to design a hemispherical resonator gyro with good angular rate measurement accuracy and low noise characteristics, and to meet the requirements of accurate orientation and attitude control of the spacecraft, thThe Hemispherical resonator gyro is a new kind of vibratory gyro with high precision and long life. In order to design a hemispherical resonator gyro with good angular rate measurement accuracy and low noise characteristics, and to meet the requirements of accurate orientation and attitude control of the spacecraft, the mechanism of noise generation of hemispherical resonator gyro is analyzed in this paper, and the effects of the harmonic oscillator parameters, control system parameters and electronic circuit parameters on the noise of the hemispherical gyro are discussed, the optimized design of the sensor and electronic circuit is carried out. The results show that the noise level and angular random walk after the optimized design are significantly reduced by about 50% of that before the optimized design, which is comparable to the noise level of the basic type HRG130P hemispherical resonator gyro from Northrop Grumman Corporation in U.S.A..
Piezoelectrics & Acoustooptics
- Publication Date: Apr. 21, 2022
- Vol. 42, Issue 6, 884 (2020)
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