分布式激光甲烷检测系统振动干扰诊断与辨识  

Diagnosis and recognition of vibration interference in distributed laser methane detection system

作　　者：郭清华 GUO Qinghua(CCTEG Chongqing Research Institute,Chongqing 400039,China;State Key Laboratory for Gas Disaster Monitoring and Emergency Technology’ Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400039 [2]瓦斯灾害监控与应急技术国家重点实验室,重庆400037

出　　处：《工矿自动化》2018年第8期1-6,共6页Journal Of Mine Automation

基　　金：国家重点研发计划专项资助项目(2016YFC0801405);国家科技重大专项课题(2016ZX05045006)

摘　　要：为消除外界振动对分布式激光甲烷检测系统的影响,在分析振动对光纤物理特性及甲烷检测的影响、振动波形频率特征的基础上,提出一种基于实时采样信号和设定频率信号的振动波形辨识算法。该算法通过傅里叶变换、互相关运算、最大相似系数判定和甲烷浓度解算等步骤,有效识别出不同频率的外界振动波形,进而可准确删除振动波形,消除外界振动对甲烷浓度测量值的影响。实验室测试及工业性测试结果表明,该算法能有效识别出不同频率的振动干扰,避免振动信号引入的测量误差。In order to eliminate influences of external vibration on distributed laser methane detection system,based on analysis of frequency characteristics of vibration waveform and influences of vibration on physical properties of fiber and methane detection,a vibration waveform recognition algorithm based on real-time sampling signal and set frequency signal was proposed.The algorithm can effectively identify external vibration waveforms with different frequencies by steps including Fourier transform,crosscorrelation operation,maximum similarity coefficient judgment and methane concentration calculation,and then the vibration waveform can be accurately deleted and the influences of external vibration on methane concentration measurement can be eliminated.The laboratory test and industrial test results show that the algorithm can effectively identify the vibration interference with different frequencies and avoid measurement error introduced by vibration signal.

关 键 词：分布式激光甲烷检测 点式激光甲烷传感器 激光自稳频 甲烷浓度测量 振动干扰 振动波形辨识 

分 类 号：TD712[矿业工程—矿井通风与安全]