Optical EngineeringInfluence of water ice absorption on transmission for a 10.5 to 12.5 μm filter window
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We present a study of the effects of a layer of water ice on the transmission of an infrared bandpass filter/window in the 10.5- to 12.5-μm spectral band. Computed spectral transmission is presented for a model consisting of water ice thicknesses of 20, 200, 2000, and 20,000 nm on the blocking stack side of a bandpass filter design. A ray angle of 20 deg is used to simulate the conditions at a filter situated in front of a cooled detector, where water ice might accumulate. The results show severe degradation in transmission for water ice thicknesses greater than 200 nm.