Patent ID: 11940375
Assignee: STATE GRID ANHUI ELECTRIC POWER RESEARCH INSTITUTE
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. A sensing system using the fiber-optic photoacoustic sensing probe capable of resisting interference from ambient noise according to claim 2, comprising: a signal collection and processing circuit (1), a laser light source drive circuit (2), a photoacoustic excitation light source (3), a double-core optical fiber (4), a fiber-optic photoacoustic sensing probe (5), a detection light source (6), a fiber-optic circulator (7), and a photodetector (8), wherein an input terminal of the photodetector (8) is connected to port 3# of the fiber-optic circulator (7), and an output terminal of the photodetector (8), the signal collection and processing circuit (1), the laser light source drive circuit (2), and the photoacoustic excitation light source (3) are connected in series and then connected to the fiber-optic photoacoustic sensing probe (5) by using one optical fiber of the double-core optical fiber (4); the detection light source (6) is connected to port 1# of the fiber-optic circulator (7), and port 2# of the fiber-optic circulator (7) is connected to the fiber-optic photoacoustic sensing probe (5) by using the other optical fiber of the double-core optical fiber (4); and the signal collection and processing circuit (1) adopts a digital lock-in amplifier based on a field programmable gate array (FPGA).