为了设计一种NO2气体检测系统，以实现对大气中NO2等污染气体进行有效监测、提高空气质量，采用激光光谱分析技术，根据NO2气体在可见光范围内的吸收光谱与强吸收峰位置，选取中心波长为443.2nm蓝光激光光源，搭建了的NO2气体检测实验平台。实验测定不同体积分数NO2气体的透射谱线，通过对不同体积分数NO2气体透射光谱分析，运用最小二乘法线性拟合计算得出系统吸光度与气体体积分数的线性关系。结果表明，实验系统能够实现对NO2气体的检测，检测灵敏度为10-4量级，具有较好应用价值。

In order to design a NO2 detection system to monitor air pollutants effectively, and improve the air quality, the laser spectrum analysis technique was applied, in which the blue laser light source at centre wavelength of 443.2nm was selected according to the absorption spectrum and the strong absorption peaks of NO2 in the visible range, and an experimental platform for NO2 was built. The transmission spectrum of NO2 with different volume fractions were tested and analyzed, and the linear relationship between absorbance and the volume fractions of NO2 was obtained by means of the least-square linear fit. The results show that the experimental system can detect the NO2 with sensitivity on the order of approximately 10-4, and it has the good application value.