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The degradation of the optical transmittance of transparent and translucent materials subjected to repeated impingements of liquid droplets was investigated. An analytical model of the problem was developed, based on the postulate that changes in transmittance are due to cracks growing in the material. A simple expression was derived for predicting transmission losses in the material. The result obtained was compared to available experimental data, and reasonable agreement was found between the present result and the data.

Optical transmission losses in materials due to repeated impacts of liquid droplets