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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 17, Iss. 19 — Oct. 1, 1978
  • pp: 3067–3075

Electrically calibrated radiometer using a thin film thermopile

L. P. Boivin and T. C. Smith  »View Author Affiliations


Applied Optics, Vol. 17, Issue 19, pp. 3067-3075 (1978)
http://dx.doi.org/10.1364/AO.17.003067


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Abstract

The fabrication and principal characteristics of an electrically calibrated absolute radiometer are described. The receiver substrate incorporates an evaporated chromium–nickel thermopile, an electrical shield, a copper thermal diffuser disk, an evaporated chromium electrical heating element, and a goldblack absorber. All insulating layers are evaporated silicon monoxide; the thermopile and heater are made by a photoetching process. The performances of several radiometers are discussed. For example, a 28-junction version has a responsivity and NEP of 93 mV/W and 50 nW, respectively, in air, with a time constant of 15 sec and a surface responsivity uniform to better than 1%. The radiometers require only a few corrections of small magnitude. An analysis of sources of error and residual uncertainties shows that the over-all precision of this type of radiometer is at least 0.5% for a power level of 50 μW. Comparative radiometric measurements are described that support this claim.

© 1978 Optical Society of America

History
Original Manuscript: March 21, 1978
Published: October 1, 1978

Citation
L. P. Boivin and T. C. Smith, "Electrically calibrated radiometer using a thin film thermopile," Appl. Opt. 17, 3067-3075 (1978)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-17-19-3067


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