非合作目标高精度激光甲烷遥测参数仿真分析与实验研究  

Simulation analysis and experimental study of high precision laser methane telemetry parameters for non-cooperative target

作　　者：周振 程跃 殷松峰 刘东[4] 李云飞 栾林 ZHOU Zhen;CHENG Yue;YIN Songfeng;LIU Dong;LI Yunfei;LUAN Lin(School of Electronic and Information Engineering,Anhui Jianzhu University,Hefei,Anhui 230601,China;Hefei Institute of Public Safety Research,Tsinghua University,Hefei,Anhui 230601,China;Anhui Zeone Safety Technology Co.,Ltd.,Hefei,Anhui 230601,China;School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei,Anhui 230601,China)

机构地区：[1]安徽建筑大学电子与信息工程学院,安徽合肥230601 [2]清华大学合肥公共安全研究院,安徽合肥230601 [3]安徽泽众安全科技有限公司,安徽合肥230601 [4]安徽建筑大学机械与电子工程学院,安徽合肥230601

出　　处：《光电子．激光》2023年第8期861-871,共11页Journal of Optoelectronics·Laser

基　　金：安徽省人工智能产业创新发展项目(基于非合作目标激光危化气体遥测系列化智能装备研发及应用)资助项目。

摘　　要：针对非合作目标激光甲烷遥测系统测量误差大、精度低和抗干扰能力差等问题,基于可调谐半导体激光吸收光谱(tunable diode laser absorption spectroscopy,TDLAS)技术和波长调制光谱(wavelength modulation spectroscopy,WMS)技术,利用simulink软件建立一套甲烷积分浓度遥测仿真系统。采用归一化二次谐波检测技术去除环境干扰。仿真分析了正弦波频率和调制系数m对归一化二次谐波信号的影响,结果表明,m=2.2为最佳调制系数,正弦波频率的大小对归一化二次谐波信号无影响,确定了甲烷积分浓度检测的有效范围为0—2000 ppm·m,在该范围内,系统仿真的误差为-3.57%—4.06%。根据仿真结果对遥测仪进行了相关参数优化和实验研究与分析,结果表明系统测量误差为-4.68%—2.45%,采用Allan方差分析方法对系统的稳定性和检测限进行评估,该系统5 s积分时间内的检测下限为37.85 ppm·m,最佳积分时间为345 s,对应的检测下限为6.27 ppm·m。该研究结果对高精度激光甲烷遥测系统研发具有重要的意义。Aiming at the problems of large measurement error,low accuracy,and poor anti-interference ability of non-cooperative target laser methane telemetry system,a set of methane integrated concentration telemetry simulation systems is established by using simulink software based on tunable diode laser absorption spectroscopy(TDLAS)and wavelength modulation spectroscopy(WMS)technology.The normalized second harmonic detection technology is used to remove environmental interference.The effects of sine wave frequency and modulation coefficient m on the normalized second harmonic signal are simulated and analyzed.The results show that m=2.2 is the best modulation coefficient,and the sine wave frequency has no effect on the normalized second harmonic signal.It is determined that the effective range of methane integral concentration detection is 0—2000 ppm·m,within this range,the error of system simulation is-3.57%—4.06%.According to the simulation results,the relevant parameters of the telemeter are optimized and experimental research and analysis are carried out.The results show that the measurement error of the system is-4.68%—2.45%.The Allan variance analysis method is used to evaluate the stability and detection limit of the system.The lower detection limit of the system under the 5 s integration time is 37.85 ppm·m,the optimal integration time is 345 s,and the corresponding lower detection limit is 6.27 ppm·m.The research results are of great significance to the research and development of a high-precision laser methane telemetry system.

关 键 词：甲烷遥测 可调谐半导体激光吸收光谱(TDLAS) 波长调制光谱 simulink 归一化二次谐波 ALLAN方差 

分 类 号：TH744[机械工程—光学工程]