基于TDLAS的全量程激光CH_4检测气室设计与研究  

Study and Design of Full-range Laser CH_4 Detection Gas Chamber Based on TDLAS Technology

作　　者：王尧 Wang Yao(Chongqing Research Institute,China Coal Technology and Engineering Group,Chongqing 400039,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling.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：《煤矿机械》2018年第10期22-24,共3页Coal Mine Machinery

基　　金：国家重点研发计划项目(2016YFC0801405);国家科技重大专项课题(2016ZX05045006);2017年重庆市社会事业与民生保障专项一般项目(cstc2017shmsA0603);2017年中煤科工集团科技创新基金项目(2017ZD005);2018年重庆市技术创新与应用示范(社会民生类)一般项目(cstc2018jscx-msybX0114)

摘　　要：为实现在线实时快速激光检测CH_4气体浓度,并保证传感器对分辨率的性能要求,通过分析不同气室长度对不同浓度CH_4气体对应的分辨率影响曲线,按照相同光程长度对应的分辨率值对应相乘,获得分辨率乘积效应值,得出气室光程长度设定在4～6 cm范围内能最大限度满足对分辨率的性能要求,开发了基于TDLAS技术的全量程激光CH_4传感器透射型测量气室,有效光程为5 cm,并综合考虑了气室结构的响应速度、防水防尘、温度压力补偿等因素,并详细阐述了测量气室的装调工艺。试验表明,该传感器在0～10%浓度范围内的测量误差小于±0.05%CH_4,在10%～100%浓度范围内的测量误差小于真值的±5%。In order to quickly detect CH_4 gas in real time and ensure the sensor＇s performance requirements for resolution, a transmission type air chamber of full-range laser CH_4 sensor, based on TDLAS technology,has been developed. By analyzing the resolution influence curve between different gas chamber lengths and different concentrations of CH_4 gas,and multiplying the resolution value of the same optical path length,the gas chamber with length in the range of 4 ～6 cm can meet the performance requirements as much as possible. The effective path length of the air chamber is 5 cm.The air chamber structure takes into account for response speed, waterproof and dustproof, temperature and pressure compensation and other factors, and the assembly and adjustment process has been expounded in detail. Test has shown that the measurement error in the range of 0%～10% is less than±0.05%CH_4,and the measurement error is less than ±5% of the true value in the range of 10%～100%.

关 键 词：激光 谐波检测 气室 煤矿 CH4 

分 类 号：TD712.55[矿业工程—矿井通风与安全]