利用半导体激光器照射大气气溶胶试样后光强衰减得到大气气溶胶消光系数.光束经过气溶胶后检测透射方向的光强值,经光电转换、信号调理、AD采样后根据朗伯比尔定理计算气溶胶消光系数.采用双通道测量气溶胶消光系数的方法,减小了由于半导体激光器光强不稳定和大气分子对测量结果的影响.对设计的系统以不同浓度的气溶胶进行了检测,其线性度良好,相对误差小于4％.所设计的大气气溶胶检测装置体积小、操作简单、探测速度快,对监测大气污染和能见度等有一定的应用价值.%A method for measuring atmospheric aerosol extinction coefficient was introduced. The coefficient was obtained by detecting the attenuation of light intensity when semiconductor laser passed through the aerosol. The light intensity values were detected, and after photoelectric conversion, signal processing and AD sampling, the aerosol extinction coefficient was calculated according to Lambert-Beer theorem. The dual-channel measurement method was used in the design, in order to reduce the effect of atmospheric molecules and the instability of the semiconductor laser light. The aerosols of different concentrations were tested. The results showed that the relative error was less than 4%. The atmospheric aerosol measurement system has the advantages of small size, simple operation and fast detection. It could be used to monitor air pollution and visibility.
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