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Updated: Feb 7, 2026

Author Spotlight: Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
Published on: February 3, 2023
Fast demodulated white-light interferometry-based fiber-optic Fabry-Perot cantilever microphone
This study presents a novel fiber-optic microphone using white-light interferometry for highly sensitive acoustic detection. The new microphone offers superior signal-to-noise ratio compared to traditional condenser microphones.
Area of Science:
- Optics and Photonics
- Acoustics and Sound Engineering
- Sensor Technology
Background:
- Traditional microphones face limitations in sensitivity and dynamic range.
- Fiber-optic sensors offer potential for enhanced performance in acoustic detection.
- Fabry-Perot interferometry is a promising technique for high-resolution measurements.
Purpose of the Study:
- To develop a highly sensitive and stable fiber-optic microphone.
- To utilize fast demodulated white-light interferometry for acoustic sensing.
- To evaluate the performance of the developed microphone in acoustic tests.
Main Methods:
- Fabrication of a fiber-optic Fabry-Perot cantilever microphone.
- Implementation of a fast demodulation method using full spectrum white-light interferometry.
- Absolute measurement of Fabry-Perot cavity length with high resolution and large dynamic range.
- Acoustic testing to determine pressure responsivity and minimum detectable acoustic pressure.
Main Results:
- Demonstrated high sensitivities and linear responsivities below 2 kHz.
- Achieved a pressure responsivity of 211.2 nm/Pa at 1 kHz.
- Measured a noise-limited minimum detectable acoustic pressure level of 5 μPa/√Hz at 1 kHz.
- Exhibited a signal-to-noise ratio over 10 times higher than a reference condenser microphone.
Conclusions:
- The developed fiber-optic Fabry-Perot cantilever microphone offers superior performance.
- Fast demodulated white-light interferometry enables high-resolution and large dynamic range measurements.
- This technology represents a significant advancement in acoustic sensing capabilities.
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