Journals >Electro-Optic Technology Application
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2024
Volume: 39 Issue 4
16 Article(s)
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Single-frequency Continuous-wave 1 064 nm Ring Laser Based on PDH Injection Locking (Invited)
QIN Zihan, FAN Wenqiang, GUO Wenbo, WANG Yulei, LYU Zhiwei, and BAI Zhenxu
Single-frequency continuous-wave lasers are widely used in the fields of optical fiber communication, laser radar and spectral analysis. In order to achieve ideal single-frequency continuous-wave output, a single-frequency continuous-wave 1 064 nm Nd:YVO4 ring laser based on PDH (Pound-Drever-Hall) injection frequency Single-frequency continuous-wave lasers are widely used in the fields of optical fiber communication, laser radar and spectral analysis. In order to achieve ideal single-frequency continuous-wave output, a single-frequency continuous-wave 1 064 nm Nd:YVO4 ring laser based on PDH (Pound-Drever-Hall) injection frequency locking technology is studied. In the experiment, a single-frequency fiber laser with a linewidth of 10 kHz is used as the seed source, and an ′8′ ring cavity is used from the power cavity to realize the injection locking of the seed light through the PDH technology. Experimental results show that under the condition of 1.04 W seed light injection, when the pump power is 38.12 W, a stable output of 13.46 W can be achieved, the corresponding linewidth is 37.26 kHz, and the power stability is ± 0.55%..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 1 (2024)
[in Chinese]
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 1 (2024)
Research on Coherent Anti-Stokes Raman Scattering Spectroscopy Excited by Tapered Fiber
HOU Mingze, CHEN Haitong, and ZHANG Yongning
The feasibility of using tapered fiber instead of focusing objective to generate coherent Raman scattering signal is verified by numerical simulation and experimental measurement. The transmission characteristics of ultra-short pulse in tapered fiber are analyzed by numerical calculation and experimental measurement. IThe feasibility of using tapered fiber instead of focusing objective to generate coherent Raman scattering signal is verified by numerical simulation and experimental measurement. The transmission characteristics of ultra-short pulse in tapered fiber are analyzed by numerical calculation and experimental measurement. It is proved that the tapered fiber with a length of 5 cm cone region can effectively ensure the time-domain and spectral characteristics of ultra-short pulse transmission in the tapered fiber, and the power attenuation is small, and the maximum insertion loss in the wavelength range of 850~1 100 nm does not exceed 1.05 dB, the average value is 0.84 dB.Then, the Raman formant of cyclohexane at 2 853 cm-1 is successfully detected by tapered fiber, which proves the feasibility of using tapered fiber to excite coherent Raman spectra. The use of tapered fiber excitation coherent Raman spectroscopy is flexible and convenient in signal excitation, which gets rid of the constraints of traditional space optics, and provides a new way for the development of coherent anti-Stokes Raman scattering (CARS) systems in the field of endoscopic imaging and minimally invasive detection..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 6 (2024)
Research on Development of Infrared Jamming Load and Equipment Abroad
YIN Qingguo, ZHANG Jingyuan, GAO Xu, and ZHU Wenjin
With the development of two-color infrared guiding technology, the existing decoy system represented by MTV has usage limit, which need to be developed to meet usage requirements. And the main issue is spectral distribution matching between that of the jamming load and airborne platform. In view of this situation, the With the development of two-color infrared guiding technology, the existing decoy system represented by MTV has usage limit, which need to be developed to meet usage requirements. And the main issue is spectral distribution matching between that of the jamming load and airborne platform. In view of this situation, the new jamming technologies abroad are studied. And new load system and jamming technologies are introduced and summarized.
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 23 (2024)
Analysis of Multidimensional New Optoelectronic Sensing System
YANG Lianlian, HAO Ke, XU Xinyang, ZHANG Jie, HE Xin, and HOU Ruipeng
The ability to obtain information is becoming increasingly important. With the rapid development of new generation information technologies such as artificial intelligence, countries around the world are competing to develop a new generation of intelligent optoelectronic sensing systems. Using multidimensional informatThe ability to obtain information is becoming increasingly important. With the rapid development of new generation information technologies such as artificial intelligence, countries around the world are competing to develop a new generation of intelligent optoelectronic sensing systems. Using multidimensional information and in? telligent algorithms to iterate and upgrade the optoelectronic sensing system, the full electromagnetic spectrum detection capability is further improved. The development needs and typical projects of intelligent optoelectronic sensing systems are mainly outlined, and the key technologies of RAIVEN intelligent sensing systems are analyzed..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 28 (2024)
Design of Cooled Infrared Zoom Optical System
CHENG Weining, and ZHAO Jiuliang
A continuous zoom mid-wave infrared optical system with an F-number of 4 and working wavelength range of 3.7~4.8 μm is designed. To achieve a large zoom ratio, a mechanical compensation method with switching roots has been employed. The narcissus phenomenon is analyzed through simulation, and the zoom curve is optimizeA continuous zoom mid-wave infrared optical system with an F-number of 4 and working wavelength range of 3.7~4.8 μm is designed. To achieve a large zoom ratio, a mechanical compensation method with switching roots has been employed. The narcissus phenomenon is analyzed through simulation, and the zoom curve is optimized. The overall structure of the optical system is compact, and the image remains clear with a smooth curve during the entire zoom process..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 37 (2024)
All-fiber pH Sensor Based on Hydrogel Swelling Characteristics in Optical Sagnac Loop
LU Qi, LIU Zhengyu, XUE Lifang, CHEN Zhihong, and ZHANG Haiwei
An optical fiber Sagnac loop pH sensor based on the swelling stress of hydrogel is developed, selecting polyacrylamide hydrogel with favorable swelling performance as the sensing medium, considering the differential swelling of hydrogel in solutions with varying pH values. The differential swelling of the hydrogel in vAn optical fiber Sagnac loop pH sensor based on the swelling stress of hydrogel is developed, selecting polyacrylamide hydrogel with favorable swelling performance as the sensing medium, considering the differential swelling of hydrogel in solutions with varying pH values. The differential swelling of the hydrogel in various pH solutions induces a change in the axial stress of the polarization-maintaining fiber to lead to spectral shifts in the Sagnac loop output. By characterizing the spectral shift, pH sensing is achieved. The sensor exhibits a linear response within the pH range of 2 to 12, with a sensitivity of 0.947 nm/pH. Experimental results show that it has good robustness, stability and repeatability..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 42 (2024)
Improved Lightweight Infrared Target Detection Algorithm Based on Deep Learning
LI Xiaoguang, HE Xin, ZHANG Yiwei, and WANG Jiawen
Infrared target detection and recognition based on deep learning algorithm is an important field in academic research. In the background of high precision in infrared target detection and recognition and lightweight algorithms, and based on YOLOv5n network model, at first, the C3 module in the network is replaced with Infrared target detection and recognition based on deep learning algorithm is an important field in academic research. In the background of high precision in infrared target detection and recognition and lightweight algorithms, and based on YOLOv5n network model, at first, the C3 module in the network is replaced with dilated residual convolution (DWR) to achieve lightweight of the network and enable the network to flexibly extract features of different scales. And then, in response to the low resolution and blurred details of infrared images, AF-FPN is used to replace the original FPN structure to improve the ability of multi-scale infrared image target recognition. At last, the iRMB attention mechanism is inserted into the detection layer, making the model lightweight while still maintaining detection accuracy similar to the original YOLOv5n. Experimental results show that the network value of the improved model has increased by 0.8% compared to the original YOLOv5n network, the model volume has reduced by 17%, and lightweight model without affecting the accuracy of model detection is achieved, which meets the requirements of small and lightweight size and is suitable for deployed on embedded devices..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 49 (2024)
Research on Noise Suppression Method for Optoelectronic Detection Based on Resonance Principle
YIN Lei, ZHANG Yao, ZHANG Haibin, HUANG Tao, and CHEN Jiawei
To study a new method of noise suppression, the LC resonance principle is adopted to amplify the effective signal. By adjusting the inductance and capacitance parameters of the LC circuit, the resonant frequency is consistent with the effective signal, which causes resonance between the effective signal and the LC circTo study a new method of noise suppression, the LC resonance principle is adopted to amplify the effective signal. By adjusting the inductance and capacitance parameters of the LC circuit, the resonant frequency is consistent with the effective signal, which causes resonance between the effective signal and the LC circuit, am? plification of weak signals and filtering out noise are achieved..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 55 (2024)
Design and Application of Backend Resource Management Framework Based on Koa and MongoDB
PU Jinlong, and REN Chuan
In recent years, a variety of small programs have emerged, with which the back-end resource management functions have become more and more common, and the design of a general-purpose, scalable and reliable back-end resource management framework has become important. To address this situation, a new Koa architecture basIn recent years, a variety of small programs have emerged, with which the back-end resource management functions have become more and more common, and the design of a general-purpose, scalable and reliable back-end resource management framework has become important. To address this situation, a new Koa architecture based on Node.js services is proposed, and the latest open source non-relational data mongodb is used to build a general resource management service, which can be used to quickly build a general resource management service,based on this, the secondary development is performed, and the back-end project can be efficiently completed..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 58 (2024)
Algorithm of High-precision Direction Pointing Compensation under Mobile Platform
LI Xuan, DU Ruijian, and JIN Dou
Under the mobile platform, the purpose is to achieve high-precision direction pointing compensation. By introducing the mobile platform′s habitual parameters, calculating the posture of the platform, establishing a direction pointing mapping model, relying on calculation rate of the algorithm in real time, the directioUnder the mobile platform, the purpose is to achieve high-precision direction pointing compensation. By introducing the mobile platform′s habitual parameters, calculating the posture of the platform, establishing a direction pointing mapping model, relying on calculation rate of the algorithm in real time, the direction pointing is compensated in real time. Through data simulation verification, the algorithm can stably and quickly calculate the direction, and make up for the direction error caused by posture changes, which is of great significance for the high-precision control of the mobile platform..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 63 (2024)
Design and Implementation of High-precision Acquisition Circuit for Fast Steering Mirror Displacement Sensor
WANG Kai, KONG Decong, CHE Hongpeng, and WANG Biheng
The high-precision and low-latency data acquisition of displacement sensors is crucial for achieving high-precision and high-bandwidth fast steering mirrors. A detailed analysis of the requirements for the displacement sensor acquisition circuit in a composite axis with a fast steering mirror is provided, based on thisThe high-precision and low-latency data acquisition of displacement sensors is crucial for achieving high-precision and high-bandwidth fast steering mirrors. A detailed analysis of the requirements for the displacement sensor acquisition circuit in a composite axis with a fast steering mirror is provided, based on this, hardware circuit and software design are carried out. Through testing, the effective resolution of the acquisition circuit can reach 17 bits, the data frequency is 5 kHz, and the signal acquisition delay is 200 μs. The high-speed and high-precision acquisition of signals from fast steering mirror displacement sensors is realized, which can effectively enhance the control bandwidth and control precision..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 67 (2024)
Simulation Research on Closed Infrared Radiation Characteristics Based on MT Pyrotechnics
WU Weiming, ZHAO Feiyu, CAO Jingeng, ZHANG Rilai, LI Chaozhen, and JIANG Chong
A closed infrared radiation characteristic generation technology based on magnesium/polyterafluoro? ethylene (MT) pyrotechnic compound is proposed. The combustion properties, the thermal property characteristics of the combustion products and infrared radiation generation principle of the MT pyrotechnic are analyzed. IA closed infrared radiation characteristic generation technology based on magnesium/polyterafluoro? ethylene (MT) pyrotechnic compound is proposed. The combustion properties, the thermal property characteristics of the combustion products and infrared radiation generation principle of the MT pyrotechnic are analyzed. In order to obtain the temperature field distribution characteristics of the surface of the infrared radiation structure, the combustion properties of the combustion products of the MT pyrotechnic compound system in a fully closed adiabatic system are analyzed through theoretical calculations. A two-dimensional axisymmetric model is established for the coupling of flow field, chemical reaction and thermal radiation. The influence of magnesium/polyterafluoroethylene agent ratio and grain diameter on the surface temperature distribution of infrared radiation structure is analyzed through numerical simulation. Simulation calculation results show that in the B pyrotechnic compound system, appropriately reducing the magnesium power content is beneficial for increasing combustion heat and improving the surface temperature of the radiation structure. In the combustion process of MT pyrotechnic compound, the higher is the temperature of the combustion products, the worse is the uniformity of the surface temperature distribution of the infrared radiation structure. By increasing the diameter of the pyrotechnic compound column and expanding the heat flow area, it is beneficial to shorten the infrared radiation intensity forming time and improve temperature distribution..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 72 (2024)
Strength Design and Check of Brittle Plastic Parts with Threaded Connections under Multiple Loads
LIN Jia, and SONG Guangyue
The failure mode of cracks in the mounting hole area under the input conditions of static and dynamic loads in the various conditions of working environment is analyzed, when brittle plastic parts are installed with threaded connections. By combining theoretical calculations and structural simulation analysis, a methodThe failure mode of cracks in the mounting hole area under the input conditions of static and dynamic loads in the various conditions of working environment is analyzed, when brittle plastic parts are installed with threaded connections. By combining theoretical calculations and structural simulation analysis, a method for strength calculation and check as well as a calculation method for limit value of mounting and fastening torque are proposed. The methods have been effectively verified through mechanical environment testing. And the improved design measures of installation and fastening are given..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 78 (2024)
Design and Analysis of Pneumatic Launching Device
SHAO Pengjie, LI Wanzhen, and SUN Zuofu
Faced with the actual needs of rapid deployment and launching of small unmanned aerial vehicle(UAV), comprehensively considering the various launching forms and working conditions at present, a pneumatic module with constant power source pressure is constructed with pressure regulator and actuating value as the core,whFaced with the actual needs of rapid deployment and launching of small unmanned aerial vehicle(UAV), comprehensively considering the various launching forms and working conditions at present, a pneumatic module with constant power source pressure is constructed with pressure regulator and actuating value as the core,which improves the launching stability. At the same time, according to the characteristics of the pneumatic launching, based on the R-K gas equation of state, the physical model simplifying and the mathematical equation modeling of the launch process are performed, and the accuracy of the theory model is improved. Based on this, the functional relationship between the launching speed and time with the gas pressure and acceleration distance and other related parameters is obtained, which provides the basis for multi-domain expansion and detailed parameter design of the entire system..
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 84 (2024)
Application Analysis of Designability of Carbon Fiber Sandwich Structure Based on Mechanical Response
YANG Fan, RU Xinghai, and WANG Shaokai
Carbon fiber sandwich structures are widely used in aviation and aerospace fields due to lightweight, high strength and corrosion-resistance properties. A design method for carbon fiber layup angle, aiming to optimize the mechanical response characteristics, and using FEM software for simulation verification is proposeCarbon fiber sandwich structures are widely used in aviation and aerospace fields due to lightweight, high strength and corrosion-resistance properties. A design method for carbon fiber layup angle, aiming to optimize the mechanical response characteristics, and using FEM software for simulation verification is proposed.Results indicate that the proposed method can fully utilize the designability of carbon fiber sandwich structures to provide references for the structural design of electronic products.
Electro-Optic Technology Application
- Publication Date: Sep. 18, 2024
- Vol. 39, Issue 4, 90 (2024)
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