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Temperature-robust optical microphone with a compact grating interferometric module.

Xinyu Hu, Yan Yue, Chen Cai

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    Summary
    This summary is machine-generated.

    A new thermally stable optical microphone offers sensitive detection of low-frequency acoustic signals. This advanced acoustic sensor maintains stable operation across a wide temperature range, outperforming traditional microphones.

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    Area of Science:

    • Acoustic Engineering
    • Optical Sensing
    • Metrology

    Background:

    • The limitations of electroacoustic microphones drive research into advanced acoustic sensors.
    • Optical microphones are emerging as a key technology for sensitive sound detection.
    • Demand for high-performance acoustic sensors necessitates novel designs.

    Purpose of the Study:

    • To develop a thermally stable optical microphone for sensitive low-frequency acoustic signal detection.
    • To investigate the robustness of the optical microphone against ambient temperature fluctuations.
    • To compare the performance of the developed optical microphone with commercial electret condenser microphones.

    Main Methods:

    • Fabrication of an optical microphone using a prestressed nickel diaphragm and a compact grating interferometric module.
    • Formation of a short Fabry-Perot cavity between the diaphragm and grating surfaces.
    • Characterization of the microphone's performance, including stability, sensitivity, and signal distortion over a temperature range of 0°C to 60°C.
    • Measurement of the microphone's response to low-frequency drone noise.

    Main Results:

    • The developed optical microphone demonstrated stable operation at the quadrature point from 0°C to 60°C.
    • The microphone exhibited high sensitivity and low signal distortion.
    • The optical microphone showed robustness to ambient temperature fluctuations due to reduced thermal drift.
    • Experimental results validated the performance against a commercial electret condenser microphone.

    Conclusions:

    • The developed optical microphone is a thermally stable and sensitive device for low-frequency acoustic detection.
    • The design utilizing a Fabry-Perot cavity enhances robustness against temperature variations.
    • This technology represents a significant advancement over existing electroacoustic microphones for specific applications.