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Dependence on Atmospheric Pressure of the Response Characteristics of Thermopile Radiant Energy Detectors

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Abstract

An account is given of an investigation into the pressure dependence of the sensitivity (i.e., responsivity) of 10 different types of thermopile detector over the pressure range 760–10−5 mm. The study is confined to those forms of thermopile commonly used for the measurement of unmodulated solar and infrared radiation. The radiation intensity-thermopile emf relationship at reduced ambient pressures is discussed, as is also the change introduced into the response-time constant. It is demonstrated that the results for the different instruments are in agreement, generally, with what is derived from the fundamental laws governing energy transfer within radiometric devices.

© 1960 Optical Society of America

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