Open AccessMicro-fiber-optic acoustic sensor based on high-Q resonance effect using Fabry-Pérot etalon
Author(s) -
Jiamin Chen,
Xue Chen,
Yongqiu Zheng,
Liyun Wu,
Chen Chen,
Han Yong
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.418736
Subject(s) - fabry–pérot interferometer , materials science , optics , refractive index , fiber optic sensor , optical fiber , flatness (cosmology) , sensitivity (control systems) , dynamic range , optoelectronics , wavelength , physics , electronic engineering , cosmology , quantum mechanics , engineering
A micro-fiber-optic acoustic sensor based on the high-quality-factor (high-Q) resonance effect that uses a Fabry-Pérot etalon (FPE) is presented in this study. The device has been demonstrated experimentally to be a high-sensitivity acoustic sensor with a large dynamic range over a wide frequency band. Optical contact technology was used to improve the robustness of the FPE, which consists of two parallel lenses with high reflectivity exceeding 99%. An acoustic signal detection system based on phase modulation spectrum technology was also constructed. A stable and high-Q value of 10 6 was measured for the FPE. As a result, high sensitivity of 177.6 mV/Pa was achieved. Because of the change in the refractive index of the air when it is modulated by the acoustic waves, a frequency response of 20 Hz-70 kHz with flatness of ±2 dB was obtained and a large dynamic range of 115.3 dB was measured simultaneously. The excellent performance of the device will be beneficial for optical acoustic sensing.