• Photonics Research
  • Vol. 12, Issue 9, 1962 (2024)
Mingwang Tian1, Xin Xu1, Sihong Chen2, Zhipeng Feng3, and Yidong Tan1,*
Author Affiliations
  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • 2Guangdong Bright Dream Robotics Co., Ltd., Foshan 310018, China
  • 3Guangzhou Modern Information Engineering College, Guangzhou 510000, China
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    DOI: 10.1364/PRJ.523382 Cite this Article Set citation alerts
    Mingwang Tian, Xin Xu, Sihong Chen, Zhipeng Feng, Yidong Tan, "Ultrasensitive detection of remote acoustic vibrations at 300 m distance by optical feedback enhancement," Photonics Res. 12, 1962 (2024) Copy Citation Text show less

    Abstract

    Sensitive detection of remote vibrations at nanometer scale owns promising potential applications such as geological exploration, architecture, and public security. Nevertheless, how to detect remote vibration information with high sensitivity and anti-disturbance has become a major challenge. Reported current non-contact measurement methods are difficult to simultaneously possess characteristics of high light intensity sensitivity, long working distance, high vibration response sensitivity, and anti-disturbance of ambient light. Here, we propose a polarization-modulated laser frequency-shifted feedback interferometry method with the above characteristics, to obtain remote vibration information. The method can directly measure non-cooperative targets without the need for any cooperative markers. In each interference cycle, the energy as low as 2.3 photons can be effectively responded to, and the vibration amplitude sensitivity at 300 m can reach 0.72nm/Hz1/2 at 1 kHz. This approach provides a strategy for the ultrasensitive detection of remote vibration that is immune to electromagnetic interference.
    T1=12[1111],T2=12[1111],T3=12[1ii1].

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    ΔIsignalI=FT1T2T3T3T2T1AκG(2Ω)  cos(4πΩtφ0+Δφ)=[i0]κG(2Ω)  cos(4πΩtφ0+Δφ)κG(2Ω)  cos(4πΩtφ0+Δφπ2).

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    G(2Ω)=2γc(η2γ2+4π2(2Ω)2)1/2(4η2γ2π2(2Ω)2+(4π2fRO24π2(2Ω)2)2)1/2,

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    Δφ=4πλnΔL,

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    ΔInoiseI=FT1T2T2T1AκG(2Ω)  cos(4πΩtφ0+Δφ)=[00]κG(2Ω)  cos(4πΩtφ0+Δφ)0.

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    Er=P0η2ΩrT/Ω0.

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    Mingwang Tian, Xin Xu, Sihong Chen, Zhipeng Feng, Yidong Tan, "Ultrasensitive detection of remote acoustic vibrations at 300 m distance by optical feedback enhancement," Photonics Res. 12, 1962 (2024)
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