The intensity calculation of the gas absorption line by multi-line Voigt fitting

Adopted the distribution feedback type （DFB） laser to measure the coal mine gas methane, according to the methane located 1.6 μm nearby 2v3 with a R9 direct absorption spectrum, attraction wire intensity of each line was calculated through the multi-line Voigt fitting. The experimental result indicates that in the obtained four attraction recover of wire, the maximum deviation is 2.7%, and the minimum deviation is 0.02%, other results are all in experimental error scope. This research method may apply in the spectrum survey methane gas density, it has characteristics including high precision, strong selectivity, fast response and so on.

基于TDLAS的火力发电厂锅炉燃烧CO浓度检测系统设计与应用

为提升火力发电厂锅炉燃烧效率,基于可调谐半导体激光吸收光谱技术和长调制光谱检测技术,设计锅炉炉膛燃烧CO在线检测系统,同时对系统误差进行了计算分析。结果表明:通过锁相放大器对探测到的激光信号进行调解,可以减小噪声对检测精度的影响;造成检测系统误差的主要因素包括初始激光强度、吸收光程、温度、二次谐波峰值、压强和调制电流幅度等6项,且误差分配结果依次为0.1 mW、4 mm、1 K、2 mV、0.05 atm和0.02 mA;通过蒙特卡洛方法对误差分配结果进行验证,结果显示系统极限误差仅为0.023%,满足检测精度要求;基于误差分析和分配结果,搭建实验平台,对10组浓度为2.5%的CO气体进行了检测,结果表明:CO浓度检测绝对误差为-0.01%~0.01%,均远小于0.025%的误差要求,表明本系统具备较高的检测精度。