在激光引信中，云雾后向散射会产生引发虚警的回波信号。基于蒙特卡罗法对云雾回波信号进行了模拟仿真，并在云雾室内开展了测量实验，利用测量结果对理论模型进行了验证。研究结果表明: 当发射脉冲宽度小于10 ns时，云雾散射回波展宽效应显著，且展宽效应主要是由多次散射产生的; 激光回波的实验测量结果与理论计算结果吻合得较好，都近似为高斯波形，且其回波宽度的差别小于6%，回波功率差别小于30%。

The cloud-and-fog scattering effect will produce laser signals resulting in false alarm for laser fuse. Based on the Monte-Carlo technology, backscattering signals of clouds and fogs are simulated and compared with results of the experiment carried out in the cloud-and-fog chamber. Results show that the pulse broadening effect mainly introduced by multiple scattering is drastical when the transmitting pulse width is less than 10 ns. And the theoretically calculated data are in good agreement with the experimental data. The temporal shapes are both close to Gaussian shape, and theoretically calculated results differ from experimental results by less than 6% for the width of the backscattering signal and 30% for the intensity of the backscattering signal.