Abstract

The paper describes an instrument for taking thermal photographs utilizing infrared radiation passively emitted by objects at ambient temperature. The instrument consists of an 8-in. radiometer utilizing thermistor infrared detectors and an imaging attachment. A glow modulator forms a thermal photograph on Polaroid or conventional film.

Quantitative analysis of thermal photographs is described, and several examples of thermal photographs are given.

© 1959 Optical Society of America

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