基于光纤激光器的机动车尾气CO排放浓度检测方法  

Detection method of CO emission from vehicle exhaust based on fiber laser

作　　者：王祺[1] WANG Qi(Zhoukou Normal University,Zhoukou Henan 450001,China)

机构地区：[1]周口师范学院,河南周口466001

出　　处：《激光杂志》2022年第6期196-200,共5页Laser Journal

基　　金：河南省科技厅科技计划项目(No.182102210600)。

摘　　要：传统方法检测CO浓度时,对CO分子激发态限值的判断不够精确,导致浓度检测存在一定误差。为此,提出基于光纤激光器的机动车尾气CO排放浓度检测方法。入射具有一定波长的光束,使CO分子对光子进行选择性吸收,得到CO红外吸收光谱,选取一条具有CO光谱特征的谱线,利用光纤激光器进行光谱检测,计算CO谱线特征参数,划分红外光谱,计算红外光谱产生热能,并将热能转换为声波,检测声波信号,通过声传播波动方程计算CO浓度。此次提出方法与三种传统方法进行对比实验,利用可调谐光纤激光器,获取CO吸收峰位置,分别对该位置的CO浓度进行检测,结果表明,当配制浓度和实验温度不同时,此次方法检测误差都要小于传统方法,提高了CO排放浓度检测灵敏度。When the concentration of CO is detected by traditional methods, the limit of excited state of CO molecule is not accurate enough, which leads to some errors in concentration detection. Therefore, a method based on fiber laser is proposed to detect the concentration of CO emission from vehicle exhaust. The incident beam with a certain wavelength makes the CO molecule selectively absorb photons, The infrared absorption spectrum of CO is obtained. A spectrum line with the characteristics of CO spectrum is selected and detected by using fiber laser. The characteristic parameters of CO spectral line are calculated, the infrared spectrum is divided, and the thermal energy is converted into sound wave, and the acoustic signal is detected. The CO concentration is calculated by the acoustic wave equation. The proposed method is compared with three traditional methods. The position of CO absorption peak is obtained by tunable fiber laser, and the CO concentration at this position is detected respectively. The results show that when the configuration concentration and experimental temperature are different, the detection error of this method is smaller than the traditional method, and the detection sensitivity of CO emission concentration is improved.

关 键 词：光纤激光器 机动车尾气 CO排放 浓度检测 光谱检测 

分 类 号：TN741[电子电信—电路与系统]