CAJ | 학술논문

分析了近红外光谱吸收式气体检测的基本原理以及煤矿采空区自然发火特征气体的选择,通过使用近红外激光光谱吸收式光纤气体传感器对采空区火灾特征气体浓度检测,报道实现了一套基于多种气体参数的火灾预测预报系统.系统使用分布反馈式半导体激光器(DFB LD)作为光源,光源驱动为低频锯齿波信号叠加高频正弦波信号,通过锁相放大器实现信号提取.根据采空区三带静态分布理论,给出了判断采空区自然发火危险程度的判定方法.该系统全部使用光纤进行井下信号传输和气体检测,使得检测精度更高,不带电工作,实时性更强,系统更加稳定可靠.
분석료근홍외광보흡수식기체검측적기본원리이급매광채공구자연발화특정기체적선택,통과사용근홍외격광광보흡수식광섬기체전감기대채공구화재특정기체농도검측,보도실현료일투기우다충기체삼수적화재예측예보계통.계통사용분포반궤식반도체격광기(DFB LD)작위광원,광원구동위저빈거치파신호첩가고빈정현파신호,통과쇄상방대기실현신호제취.근거채공구삼대정태분포이론,급출료판단채공구자연발화위험정도적판정방법.해계통전부사용광섬진행정하신호전수화기체검측,사득검측정도경고,불대전공작,실시성경강,계통경가은정가고.
The principle of gas detection with spectrum absorption is explained and the typical gas in coal mine is given. A goaf spontaneous combustion prediction system with multiple parameters is introduced in detail. The system uses a distributed feedback diode laser as light source, which is driven by a low frequency sawtooth wave overlapped with a high-frequency sinusoidal signal. Signal extraction is achieved with a lock-in amplifier. The method to determine spontaneous combustion of coal mine goaf is explained according to the theory of static distribution of three zones. The system uses fiber to detect gas and transmit signal, which makes the real time detection accurate, stable and reliable due to absence of electricity.