Patent ID: 11940375
Assignee: DALIAN UNIVERSITY OF TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The fiber-optic photoacoustic sensing probe capable of resisting interference from ambient noise according to claim 1, wherein a working process is as follows: a gas enters the photoacoustic microcavity (11) through the gaps (141) on the sound-sensitive diaphragm (14) after diffusing into the miniature air chamber (12) through the plurality of diffusion micropores (13); photoacoustic excitation light is incident into the photoacoustic microcavity (11) through the fiber-optic collimator (9), and then excited to generate a photoacoustic pressure wave to cause the sound-sensitive diaphragm (14) to vibrate periodically; and a deflection of the diaphragm is measured by using the fiber-optic Fabry-Perot interferometer, and a concentration of the to-be-measured gas is inverted.