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A Simple Infra-red Absorption Meter for Gauging Precipitable Water Vapor

Wallace E. HowellW. E. Howell Associates

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A simple absorption meter has been built, by using an interference filter, which compares the intensity of incident light in a water-vapor absorption band and in a nearby “window” band. Experiments with the instrument show that it is sensitive to small differences in absorption not only from a direct sunbeam but also from diffuse light scattered by the sky or reflected from clouds. Further observations on clouds are suggested as perhaps being capable of useful interpretation.

A simple absorption meter has been built, by using an interference filter, which compares the intensity of incident light in a water-vapor absorption band and in a nearby “window” band. Experiments with the instrument show that it is sensitive to small differences in absorption not only from a direct sunbeam but also from diffuse light scattered by the sky or reflected from clouds. Further observations on clouds are suggested as perhaps being capable of useful interpretation.

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