In space environment, molecular contamination condensed on sensitive surface is an important influence to the e-quipment characteristic. Based on dynamics theory of materials outgassing, this paper studied the processes of outgassing, transferring and adsorption experienced by outgassing molecules. Establish a model of multilayered system by analyzing the process of molecular contamination films. And make prediction to the influencing factor of transmittance of optical surface which has been contaminated. By measuring the transmittance of molecular contamination films produced from two nonmetal materials in different temperature and different sequence, the results indicate that the transmittance attenuation will increase along with the heating temperature. And the deposition sequence is an important influence to the optical performance. These conclusions verify the correctness of the model of multilayered system model.%空间分子污染凝结在航天器敏感表面会造成相关设备性能下降甚至失效.通过材料真空出气动力学理论,分析了分子污染在空间环境下出气、输运以及吸附过程,推导了分子污染层的形成过程并以此建立分子污染多层沉积膜物理模型.利用多层污染模型预测被污染光学表面透过率的影响因素预估,并测量两种常见的星用非金属材料不同温度下、不同沉积顺序的出气污染膜的透过率.研究结果表明样品受热温度越高,沉积的污染膜对光学表面的透过率衰减越大,且多层污染膜沉积的顺序对光学性能的影响很大,验证了模型预测结果的正确性.
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