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A Grating Interferometric Acoustic Sensor Based on a Flexible Polymer Diaphragm.

Linsen Xiong1,2, Zhi-Mei Qi1,2

  • 1State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

Sensors (Basel, Switzerland)
|December 23, 2023
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Summary

This study introduces a novel grating interferometric acoustic sensor using a flexible polymer diaphragm. It achieves high sensitivity and a flat frequency response for applications in speech and oil analysis.

Keywords:
flexible diaphragmgrating interferometryoptical acoustic sensor

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Area of Science:

  • * Optics
  • * Acoustics
  • * Materials Science

Background:

  • * Traditional acoustic sensors face limitations in sensitivity and frequency response.
  • * Optical interferometric methods offer potential for enhanced acoustic sensing.
  • * Flexible polymer diaphragms are suitable for vibration-based sensing applications.

Purpose of the Study:

  • * To propose and demonstrate a flexible-diaphragm acoustic sensor based on grating interferometry (GI).
  • * To evaluate the sensor's performance, including frequency response and minimum detectable sound pressure.
  • * To explore potential applications in speech acquisition and oil water content measurement.

Main Methods:

  • * Design and fabrication of a grating interferometric acoustic sensor prototype.
  • * Utilization of a gold-coated polyethylene terephthalate diaphragm.
  • * Conversion of diaphragm vibration-induced cavity length changes into electrical signals via a photodetector.

Main Results:

  • * The sensor prototype exhibited a flat frequency response within the voice frequency band.
  • * Achieved a minimum detectable sound pressure of 164.8 µPa/√Hz.
  • * Demonstrated potential for applications in speech acquisition and oil water content measurement.

Conclusions:

  • * The developed grating interferometric acoustic sensor shows high performance.
  • * The flexible polymer diaphragm design is effective for acoustic sensing.
  • * This work provides a reference for designing advanced optical interferometric acoustic sensors.