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5 April 1983 Damage Of Infrared-Transparent Materials Exposed To Rain Environments At High Velocities
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Materials for infrared windows, selected on the basis of their transparency at selected wavelengths, are often subject to damage from exposure to rain at high velocities. This damage may result in a loss of transmittance, the magnitude of which depends on the velocity and the time spent in the rain, or it may result in a structural failure of the window. This latter may occur without significant prior loss of transmittance. It is necessary to know the effects of the anticipated rain environment on the performance of the various window materials, so operating limits can be defined. For this reason, a considerable amount of experimental and analytical work has been performed to determine the response of infrared-transparent materials to water drop impact. Additional objectives are to guide the development of materials with improved erosion resistance and to develop methods to protect the less erosion resistant materials. This paper describes some of this work which has been performed at Bell Aerospace Textron.
© (1983) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. V. Hackworth "Damage Of Infrared-Transparent Materials Exposed To Rain Environments At High Velocities", Proc. SPIE 0362, Scattering in Optical Materials II, (5 April 1983);

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