Distributed optical fiber coal mine roof safety monitoring system and method
A distributed optical fiber and safety monitoring technology, which is applied in the direction of measuring devices, using optical devices to transmit sensing components, converting sensor outputs, etc., can solve the problems of temperature and strain cross-sensitivity, the inability to accurately measure temperature and strain, etc., to improve On-site safety, resolution of temperature and strain cross-sensitivity issues, effects of eliminating losses
Active Publication Date: 2021-11-16
TAIYUAN UNIV OF TECH
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[0003]
In the actual measurement of the distributed optical fiber multi-parameter fusion sensing system, when the two parameters of temperature and strain change, the Brillouin frequency shift and intensity will also change, and it changes linearly with the change of temperature and strain , followed by temperature and strain cross-sensitivity phenomenon, unable to accurately measure temperature and strain
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[0040] Such as figure 1 As shown, the distributed optical fiber coal mine roof safety monitoring system provided by the present invention includes: a narrow linewidth laser 1, a first optical coupler 2, an electro-optic intensity modulator 3, a pulse generator 4, an erbium-doped fiber amplifier 5, an optical filter device 6, optical circulator 7, acousto-optic modulator 8, second optical coupler 9, double-ended balanced detector 10, differential amplifier 11, dual-band bandpass filter 12, radio frequency power amplifier 13, mixer 14, microwave Source 15, first low-noise amplifier 16, first band-pass filter 17, second low-noise amplifier 18, second band-pass filter 19, data acquisition card 20, computer 21, GFPR optical cable 22, scientific research borehole 23, Unconsolidated layer 24, upper igneous rock 25, lower igneous rock 26, working face roof 27, coal seam 28.
[0041] Wherein, the output end of the narrow linewidth laser 1 is connected to the input end of the first opt...
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The invention discloses a distributed optical fiber coal mine roof safety monitoring system and method, and belongs to the technical field of coal mine roof safety monitoring. The invention aims to provide an improvement of a distributed optical fiber coal mine roof safety monitoring system hardware structure. According to the technical scheme adopted by the invention, the system comprises a narrow linewidth laser, a distributed optical fiber multi-parameter fusion sensing system, a signal acquisition and processing module and a GFPR optical cable; light waves generated by the narrow linewidth laser enter the distributed optical fiber multi-parameter fusion sensing system; a Brillouin scattering light signal and a Rayleigh scattering light signal generated by the GFPR optical cable enter the distributed optical fiber multi-parameter fusion sensing system; the distributed optical fiber multi-parameter fusion sensing system outputs the Brillouin scattering light signal and the Rayleigh scattering light signal to the signal acquisition and processing module; and the signal acquisition and processing module acquires Brillouin frequency shift and Rayleigh scattering light phase and intensity at the same time through demodulation to obtain strain, temperature and micro-seismic information along the GFPR optical cable. The system and method are applied to coal mines.
Description
technical field [0001] The invention discloses a distributed optical fiber coal mine roof safety monitoring system and method, belonging to the technical field of coal mine safety monitoring. Background technique [0002] In recent years, with the development of optical fiber and optical fiber communication, the development of optical fiber sensing technology has been greatly promoted. Due to the advantages of optical fiber sensing technology in long-distance measurement, anti-electromagnetic interference, and distributed, it has broad application prospects in the field of coal mine roadway monitoring . Among the major types of energy consumption in my country, coal is still at the forefront, so ensuring the safe mining of coal mines is a prerequisite for the stable operation of social production and life. The back mining of the coal mine working face will destroy the equilibrium state of the original stratum, resulting in the sudden change of stress in the internal rock st...
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IPC IPC(8): G01D5/353
CPCG01D5/35361G01D5/35364
Inventor 靳宝全李顺班白清高妍张红娟王宇刘昕
Owner TAIYUAN UNIV OF TECH
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