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中文摘要：
当烟幕光学厚度较大时,依据Lambert-Beer定律计算烟幕透过率时会存在较大误差。为了实现高精度求解烟幕透过率,采用数值计算方法,应用随机游走粒子-烟团模式（RPPM）和Vander Hulst近似计算方法,对一级多次散射近似法求解烟幕透过率的算法进行了改进,并以此对一次烟幕测试结果进行了数值模拟。结果表明本文方法能以较高精度对烟幕透过率进行有效计算。
英文摘要：
In the optical measurement of infrared smoke screen,considerable confusion exists regarding the applicability limits of the Lambert-Beer law of optical transmission.By means of the approximate Vander Hulst numeration method and random-walk particle-puff model（RPPM）,the calculation of smoke transmission based on first-order multiple scattering approximation is improved on,and it is used to simulate an infrared smoke transmission test.Numerical simulation indicates that it is more accurate to receive the effective smoke transmission.
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