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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)

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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.”

LOUIS HARRIS, "Rapid Response Thermopiles," J. Opt. Soc. Am. 36, 597-599 (1946)

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  1. L. Harris and A. C. Scholp, J. Opt. Soc. Am. 30, 519 (1940).
  2. A. Stockfleth, M.I.T. Ph.D. Thesis (November, 1942).
  3. L. C. Roess and E. N. Dacus, Rev. Sci. Inst. 16, 164 (1945).
  4. L. Hlarris, J. App. Phys. 17, 757 (1946).
  5. W. Bussem, F. Gross, and K. Hermann, Zeits. f. Physik 64, 537 (1930).
  6. H. C. Burger and P. H. Van Cittert, Zeits. f. Physik 66, 210 (1930).

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