Dalian University of Technology

State Grid Anhui Electric Power Research Institute

Min Guo

Yu Tian

Fengxiang Ma

Yue Zhao

Ke Chen

Chen Hang

Feng Zhu

Yabin Ma

Xiaofang Yuan

The present disclosure relates to the technical field of fiber-optic gas sensing and laser photoacoustic spectroscopy, and reliability of a gas detection system is improved by actively selecting a working frequency of low noise interference combined with an optical fiber photoacoustic sensing probe capable of isolating high-frequency noise. A gas enters a photoacoustic microcavity through gaps on a sound-sensitive diaphragm after diffusing into a miniature air chamber through a plurality of micropores. Photoacoustic excitation light is incident into the photoacoustic microcavity through a fiber-optic collimator and then excited to generate a photoacoustic pressure wave to cause the sound-sensitive diaphragm to vibrate periodically. An end face of a single-mode optical fiber and the sound-sensitive diaphragm constitutes a fiber-optic Fabry-Perot interferometer. The interferometer measures a deflection of the diaphragm and inverts a concentration of the to-be-measured gas.

Fiber-optic photoacoustic sensing probe capable of resisting interference from ambient noise, and sensing system

Growing community of inventors

Liaoning, China

Min Guo