为了更精确定量遥测酒驾人员呼出气体中的酒精气体浓度, 采用同时测量酒精气体浓度和水汽浓度且同步获取车内酒精气体稀释系数的双谱段定波长激光遥感探测方法, 进行了酒精浓度、水汽浓度的反演算法以及稀释系数计算的理论分析和对吸收光谱的实验验证, 取得了酒精气体和水汽光谱吸收特性, 确定了所用激光波长为1392nm和1412nm。结果表明, 该方法可以排除水汽干扰且获得酒气稀释系数, 可更精确定量测量呼出气体中的酒气浓度。

In order to measure the concentration of alcohol gas in the drunk drivers’ breath more accurately and quantitatively, the bi-spectrum laser remote sensing detection method was used to detect the concentration of alcohol gas and water vapor at the same time, and the dilution coefficient of the alcohol gas in the vehicle was simultaneously obtained. The inversion algorithm of alcohol concentration and water vapor concentration was carried out. The dilution coefficient was calculated theoretically and the absorption spectrum was verified by experiments. The spectrum absorption characteristics of alcohol gas and water vapor were obtained. The results show that, the laser wavelength are determined to be 1392nm and 1412nm. The method can eliminate moisture interference and obtain the dilution coefficient of alcohol gas, which can more accurately and quantitatively measure the concentration of alcohol in exhaled gas.