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Interference type fiber bragg grating acoustic emission signal sensing system

A technology of optical fiber Bragg and sensing system, which is applied in the direction of transmitting sensing components with optical devices, using acoustic wave emission technology for material analysis, and converting sensor output, etc., to achieve high precision, good effect, and high detection sensitivity.

Pending Publication Date: 2020-04-07
BEIJING NORTH VEHICLE GROUP CORP +1
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Problems solved by technology

[0006] The present invention proposes an interferometric optical fiber Bragg grating acoustic emission signal sensing system to solve the technical problem of how to accurately obtain acoustic emission signals

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  • Interference type fiber bragg grating acoustic emission signal sensing system

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specific Embodiment approach

[0021] The specific implementation is as follows: the broadband light output by the ASE broadband light source 1 is amplified through the EDFA erbium-doped fiber amplifier 2, and then reaches the fiber Bragg grating 4 through the fiber circulator 3; After the circulator 3 is divided into two beams of light through the 1×2 fiber coupler 5, the two beams of light respectively enter two optical fiber delay lines 6 and 7 with different delays, and are respectively connected to the same side of the 3×3 fiber coupler 8 Two input ports; the three output ports of the 3×3 fiber optic coupler 8 are respectively connected to the multi-channel photoelectric detection circuit module 9 to convert the optical signal into an electrical signal; the electrical signal enters the multi-channel preamplifier circuit module 10 for amplification, After the final electrical signal is collected by the multi-channel digital acquisition card 11, it enters the FPGA field programmable gate array 12 for sign...

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Abstract

The invention provides an interference type fiber bragg grating acoustic emission signal sensing system. The system comprises a fiber bragg grating, a 1 * 2 fiber coupler, two fiber delay lines, a 3 *3 fiber coupler, a multichannel photoelectric detection circuit module, a multichannel pre-amplifier circuit module, a multichannel digital acquisition card and an FPGA field programmable gate array.According to the system, an unbalanced Mach-Zehnder interferometer consisting of a 1 * 2 optical fiber coupler, an optical fiber delay line and a 3 * 3 optical fiber coupler is utilized; the change of the central wavelength generated by the acoustic emission signal acting on the fiber bragg grating is converted into the change of the phase difference of the receiving end of the interferometer, and then converted into the change of the light intensity, and finally the detection of the acoustic emission signal is realized through photoelectric conversion and signal processing. According to theinvention, the influence of temperature change on acoustic emission signal detection can be effectively reduced, and the system stability and the detection precision are improved.

Description

technical field [0001] The invention belongs to the technical field of acoustic emission detection, and in particular relates to an interference type optical fiber Bragg grating acoustic emission signal sensing system. Background technique [0002] Ultrasound is a mechanical wave that vibrates at a higher frequency than sound waves. Ultrasonic detection of structural defects is a technology that uses high-sensitivity ultrasonic sensors to collect signals from ultrasonic probes, and understands the development of structural defects through parameters such as the amplitude, time, and waveform changes of these ultrasonic signals. Check the health status of the hardware. Due to the advantages of strong penetrating ability, high sensitivity and universal applicability, ultrasonic testing technology has been widely used in in-service safety inspection and life assessment in aerospace, railway transportation, boiler pressure vessel and other fields. [0003] The fiber Bragg grati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01D5/353G01N29/14
CPCG01H9/004G01D5/35329G01N29/14G01N2291/0289
Inventor 杜勤祁金秋李克雷王森温志强李宁宋静魏鹏毛永慧张国振武伟尤金霞苗冬生陈娟丽李利杰王钊毕京红
Owner BEIJING NORTH VEHICLE GROUP CORP
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