论文部分内容阅读
报导了采用基于室温脉冲量子级联激光器的脉内光谱检测技术,利用中心波长为1904cm-1的量子级联激光器,在实验室对NO气体样品进行检测的研究结果.针对单线直接吸收光谱反演算法进行了研究,介绍了基线拟合的最小二乘算法以获取其吸光度,根据HITRAN数据库中相应吸收谱线的吸收线强,采用扫描积分实现了气体浓度的反演,避免了标气标定造成的误差及污染;通过拟合残差分析得到了系统的检测限,达到3.4×10-6m.
This paper reports the results of in-laboratory detection of NO gas using an in-line spectral detection technique based on room temperature pulse quantum cascade lasers and a quantum cascade laser with a center wavelength of 1904cm-1. The least square algorithm of baseline fitting was introduced to get the absorbance. According to the absorption line intensity of corresponding absorption line in HITRAN database, the integral of gas was used to realize the inversion of gas concentration, which avoided the calibration of standard gas The error and pollution of the system were analyzed. The detection limit of the system was obtained by fitting residual analysis, reaching 3.4 × 10-6m.