Optical fiber multi-parameter detecting system and method for goaf traffic infrastructures

Abstract

The invention discloses an optical fiber multi-parameter detecting system for goaf traffic infrastructures. The optical fiber multi-parameter detecting system comprises a chaotic laser emitting device, a 2*2 optical fiber coupler, a first isolator, a first 3*3 optical fiber coupler, a third optical fiber polarization controller, an electro-optical modulator, a sinusoidal signal generator, a firstadjustable optical delay generator, a second erbium-doped optical fiber amplifier, a polarization scrambler, a second isolator, a third erbium-doped optical fiber amplifier, a fourth optical fiber polarization controller, an acousto-optic modulator, a pulse generator, a second 3*3 optical fiber coupler, a second adjustable optical delay generator, a third 1*2 optical fiber coupler, a second circulator, a fourth 1*2 optical fiber coupler, multi-core sensing optical fibers, a Bragg grating, a wavelength division multiplexer, a band-pass filter, an avalanche photoelectric amplifier, a first photoelectric detector, a second photoelectric detector, a third photoelectric detector, a high-speed collecting card, a computer controller, a spectrograph and a faraday rotator mirror. According to the optical fiber multi-parameter detecting system, the temperature, strain, vibration and displacement along the optical fibers are simultaneously measured in real time.

Description

technical field [0001] The invention relates to the field of distributed optical fiber sensing, in particular to an optical fiber multi-parameter detection system and method for goaf traffic infrastructure. Background technique [0002] High-speed transportation infrastructure is a public service system used to ensure the efficient and normal implementation of social and economic activities in a country or region. Realizing the safety monitoring of high-speed transportation infrastructure and ensuring the safe operation of traffic has become a major strategic demand of the country and localities. [0003] Taking Shanxi Province as an example, Shanxi Province is an important energy and raw material base in the country. The large-scale mining of underground coal has caused a large area of ​​goaf in Shanxi Province. The province has 157,000 square kilometers of land, and the goaf is nearly 30,000 square kilometers. . Many expressways in the “Three Vertical, Twelve Horizontal ...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the inability to realize multi-parameter simultaneous detection in the existing optical fiber sensing technology, and the contradiction between sensing distance and spatial resolution, the present invention proposes an optical fiber multi-parameter detection system and Detection method

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