基于可调谐半导体激光吸收光谱的甲烷传感系统

发布时间：2018-03-11 01:12

  本文选题：光谱学　切入点：可调谐二极管激光吸收光谱　出处：《激光与光电子学进展》2015年12期 　论文类型：期刊论文

【摘要】：实验设计了一种基于可调谐二极管激光吸收光谱技术的甲烷传感系统,主要针对宽温度范围、全浓度、高精度的实时检测仪器进行研究。优选1653.7 nm窄线宽分布反馈式激光器作为光源,采用多次反射气室,结合波长调谐和全数字锁相放大器的二次谐波信号检测技术,通过最小二乘法拟合不同温度和不同浓度下的二次谐波测量数据,对检测系统进行背景扣除和温度补偿,高精度地反演出甲烷气体的浓度。实验结果表明,系统在浓度为0~1%时的检测误差小于±0.02%,1%~100%时检测误差小于真值的±2%,响应时间小于10 s。长时间的稳定性测试和高低温实验证实该系统可靠性高,能够稳定工作在宽温度范围内(0℃~40℃)。该系统满足煤矿检测标准的要求,为防治瓦斯突出灾害提供了保障。
[Abstract]:An experimental methane sensing system based on tunable diode laser absorption spectroscopy is designed. The high precision real-time detection instrument is studied. A 1653.7 nm narrow linewidth distributed feedback laser is chosen as the light source, and the second harmonic signal detection technology is adopted in combination with wavelength tuning and digital phase-locked amplifier. The second harmonic measurement data at different temperature and different concentration were fitted by least square method, and the background deduction and temperature compensation were carried out on the detection system, and the methane concentration was reversed with high precision. The experimental results show that, The detection error of the system at the concentration of 0 ~ 1 is less than 卤0.02 and less than 卤2 when the detection error is less than the true value, and the response time is less than 10 s. The reliability of the system is proved by long time stability test and high and low temperature experiments. The system can work stably in a wide temperature range from 0 鈩，

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