Abstract

Thermal radiation calorimeters have been constructed with relatively thick receivers which permit the direct recording of integrated thermal energy dose as a function of time. However, it is shown that with proper receiver design the rate of change of recorded temperature can be made proportional to the rate of delivery of energy within a reasonably short time constant. Thus, differentiation of the recorded temperature data will give an accurate picture of the irradiance-time history of an impinging pulse. Several hundred calorimeters have been successfully used, both in the laboratory and in the field, to measure, with a time constant of 20 milliseconds or less, radiant energy pulses up to 100 cal/sq cm with peak irradiances up to 200 cal/sq cm/sec. The primary advantages of the instruments are that they are small, simple, rugged, and that they provide a signal which may be recorded without complex amplification equipment directly on a high speed oscillographic recorder.

© 1958 Optical Society of America

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