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

Claim 0:
1. A fiber-optic photoacoustic sensing probe capable of resisting interference from ambient noise, comprising a fiber-optic collimator (9), a single-mode optical fiber (10), a photoacoustic microcavity (11), a miniature air chamber (12), a diffusion micropore (13), a sound-sensitive diaphragm (14), and a sound-insulated housing (15), wherein the miniature air chamber (12) is provided inside the sound-insulated housing (15), the miniature air chamber (12) is cylindrical, and a plurality of diffusion micropores (13) communicating with the outside are provided along a diameter direction of the miniature air chamber (12); the sound-sensitive diaphragm (14) is installed inside the miniature air chamber (12), and comprises a plurality of gaps (141) that constitute a cross-shaped beam structure at a central position of the sound-sensitive diaphragm (14); the photoacoustic microcavity (11) is deployed inside the sound-insulated housing (15) along a direction perpendicular to the miniature air chamber (12), one end of the photoacoustic microcavity (11) is connected to the outside, and the other end of the photoacoustic microcavity (11) is connected to the miniature air chamber (12); the fiber-optic collimator (9) is sealed and installed on the end, connected to the outside, of the photoacoustic microcavity (11); the single-mode optical fiber (10) is connected to the miniature air chamber (12) along a horizontal center line of the sound-insulated housing (15); and a center of the sound-sensitive diaphragm (14) and an end face of the single-mode optical fiber (10) constitute a fiber-optic Fabry-Perot interferometer.