Distributed optical fiber coal mine roof safety monitoring system and method

Abstract

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...

AI Technical Summary

Problems solved by technology

[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

Images