基于双波长稳定技术的光纤甲烷传感系统研究  

Fibre-optic sensor system for methane based on dual-wavelength stability technology

作　　者：付华[1] 胡冰[1] 

机构地区：[1]辽宁工程技术大学电气与控制工程学院,辽宁葫芦岛125105

出　　处：《传感器与微系统》2008年第12期33-35,共3页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(70572070);辽宁省优秀人才基金资助项目(2005219005);辽宁省科技攻关计划资助项目(2006220019)

摘　　要：鉴于煤矿开采过程中,背景噪声相当复杂且多变,如何能将有效的AE信号提取出来是一个关键问题。利用改进型AE传感双波长稳定技术和小波变换多尺度分析极强的时域频域特性与局部化特性好的特点,对小波系数进行分时分频相关分析处理,消除部分噪声,再利用小波重构和小波阈值技术,对重构信号前后进行消噪处理,提取有效AE信号。结果表明:采用此方法可以有效提高AE信号的信噪比,达到消噪目的。In view of complex and changeable background noise in coal mines exploitation, the key question is how to extract the effective AE signal. Improved AE sensor dual-wavelength stability technology and the wavelet multi-criterion analysis have great time-frequency-domain and localization characteristic, by carrying on time- frequency analysis procession to the wavelet coefficient, and partial noise is eliminated by wavelet restructing and the threshold technology, denoising procession is carried on to restructing signal, the effective AE signal is extracted. The result indicates that this method is used to enhance signal-to-noise ratio of the AE signal effectively and achieve the denoising aim.

关 键 词：双波长检测 AE信号 相关分析 小波阈值 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]