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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 36, Iss. 10 — Oct. 1, 1946
  • pp: 597–599

Rapid Response Thermopiles

LOUIS HARRIS  »View Author Affiliations


JOSA, Vol. 36, Issue 10, pp. 597-599 (1946)
http://dx.doi.org/10.1364/JOSA.36.000597


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Abstract

A technique has been developed for the evaporation of bismuth and of antimony upon thin cellulose nitrate so that the metals have comparatively low electrical resistivities and comparatively high thermal e.m.f.’s. A procedure has been developed for making bismuth-antimony radiation thermopiles in which units of 50 thermal junctions have a receiving area of ~0.11 cm2 and a resistance of ~70 ohms. These units are called "folded thermopiles.” The response of several folded thermopiles of different design operated at atmospheric pressure has been studied over a range of frequencies. The "folded” thermopiles are faster than any thermopiles reported heretofore, yet the response is greater for all frequencies above 5 cycles per second than for evaporated thermocouples operated in a vacuum. The thermopiles are rugged, relatively free of microphonics, and show very little noise in addition to "Johnson noise.”

Citation
LOUIS HARRIS, "Rapid Response Thermopiles," J. Opt. Soc. Am. 36, 597-599 (1946)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-36-10-597

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