Abstract

We demonstrate a highly sensitive and stable fiber-optic Fabry–Perot cantilever microphone based on fast demodulated white-light interferometry. The cavity length of the low-finesse Fabry–Perot interferometry is absolutely measured by realizing a high-speed demodulation method utilizing a full spectrum, with the advantages of both high resolution and large dynamic range. An acoustic test demonstrates high sensitivities and linear responsivities at frequencies below 2 kHz. The pressure responsivity and the noise-limited minimum detectable acoustic pressure level are measured to be 211.2 nm/Pa and $5\mathrm{\mu Pa}/{\mathrm{Hz}}^{1/2}$, respectively, at the frequency of 1 kHz. Comparative experimental results show that the signal-to-noise ratio is over 10 times higher than a reference condenser microphone.

© 2018 Optical Society of America

Lock-in white-light-interferometry-based all-optical photoacoustic spectrometer

Ke Chen, Zhihao Yu, Zhenfeng Gong, and Qingxu Yu
Opt. Lett. 43(20) 5038-5041 (2018)

Simultaneous measurement of acoustic pressure and temperature using a Fabry-Perot interferometric fiber-optic cantilever sensor

Ke Chen, Beilei Yang, Hong Deng, Min Guo, Bo Zhang, Yang Yang, Shuai Liu, Yaming Zhao, Wei Peng, and Qingxu Yu
Opt. Express 28(10) 15050-15061 (2020)

Sensitivity-enhanced Fabry-Perot interferometric fiber-optic microphone using hollow cantilever

Shen Tian, Yingying Qiao, Mu Liang, Mingyang Feng, Yang Gao, Lei Li, and Chongxin Shan
Opt. Express 31(13) 21796-21805 (2023)

High-sensitivity photoacoustic gas detector by employing multi-pass cell and fiber-optic microphone

Bo Zhang, Ke Chen, Yewei Chen, Beilei Yang, Min Guo, Hong Deng, Fengxiang Ma, Feng Zhu, Zhenfeng Gong, Wei Peng, and Qingxu Yu
Opt. Express 28(5) 6618-6630 (2020)

Wideband fiber-optic Fabry-Perot acoustic sensing scheme using high-speed absolute cavity length demodulation

Yang Yang, Ya Wang, and Ke Chen
Opt. Express 29(5) 6768-6779 (2021)