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潮气吸附是薄膜光学滤光片的光学不稳定性的主要原因。本文介绍了利用吸附技术研究ZnS和MgF_2构成的截止滤光片、宽带滤光片等的潮气渗透过程及潮气吸附所引起的分光特性的漂移。对于短波通滤光片,这种漂移可达200A左右,而对于间隔层为MgF_2的多腔宽带滤光片.漂移量可达250A左右。这与基于薄膜的聚集密度概念在PC-1500袖珍计算机上模拟的结果相当一致。
Moisture absorption is the main reason for the optical instability of thin-film optical filters. This article describes the use of adsorption technology to study the cut-off filter composed of ZnS and MgF_2, broadband filters and other moisture infiltration process and moisture absorption caused by the spectral characteristics of the drift. For shortwave pass filters, this drift can reach about 200A, while for the spacer layer of MgF_2 multi-cavity broadband filter, the drift of up to 250A or so. This is in good agreement with the results of a simulation based on the concept of film-based packing density on a PC-1500 pocket computer.