Acoustic emission signal sensing system based on matching-type fiber Bragg grating (FBG)
A technology of acoustic emission signal and fiber Bragg, which is applied in the use of acoustic emission technology for material analysis, the use of wave/particle radiation, and the measurement of ultrasonic/acoustic/infrasonic waves, etc. System and other problems, to achieve the effect of strong anti-electronic interference, high detection accuracy and low noise
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[0017] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so as to better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.
[0018] Such as figure 1 As shown, the matching fiber Bragg grating acoustic emission signal sensing system of the present invention includes: broadband light source 1, first and second fiber couplers 2, 8, fiber Bragg grating 3, tunable fiber Bragg grating filter 6 , the first and second photodetection circuits 7, 9, the analog-to-digital conversion circuit 10, and the FBGA 4; wherein, the A port and the C port of the first fiber coupler 2 are respectively connected to the broadband light source 1 and the fiber Bragg grating 3, and the B port is connected to The D port of the second fiber coupler 8; ...
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