摘要
针对目前煤矿及管廊等甲烷传感器多采用热催化、红外原理进行检测,需人工定期校准问题,设计一种光纤光谱吸收方式进行甲烷检测系统。该系统基于Beer-Lambert定律,选择波1653.7nm的DFB激光器作为光源,利用光纤耦合器将光源引入测量气室和参比气室,采用参比气室的检测信号实时对系统进行精度校准,创新性研制成功一种自调校式甲烷浓度检测系统。试验表明该系统研制的传感器无需人工标定,在连续工作达180d,测量标准浓度76.5%vol,室温状态下测量误差为±5%。基于该技术进行测量气室阵列扩展,可实现多达64个测量气室阵列,测量气室部分无源,本征安全,特别适用于煤矿瓦斯抽放管道计量、城市管廊燃气仓等防爆区域扩展应用。
A self-adjusting methane concentration detection system is developed by using the real-time detection signal of reference gas chamber to calibrate the accuracy of the system. Experiments show that the sensor developed by this system does not need manual calibration. It can work continuously for 180 days, measure the standard concentration 76.5% vol, and the measurement error is(+) 5% at room temperature. Based on this technology, 64 measuring chamber arrays can be realized. The measuring chambers are partly passive and intrinsically safe. It is especially suitable for expanding the application of explosion-proof areas such as coal mine gas drainage pipeline metering and city gas bunker.
引文
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