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Applied Optics

Applied Optics


  • Vol. 12, Iss. 4 — Apr. 1, 1973
  • pp: 810–817

Active Cavity Radiometer

Richard C. Willson  »View Author Affiliations

Applied Optics, Vol. 12, Issue 4, pp. 810-817 (1973)

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The active cavity radiometer (ACR) is a pyrheliometer that accurately defines the absolute radiation scale. The physics of the pyrheliometric method and the ACR approach to this method are presented in detail. A mathematical abstraction of the method is generated through a quasi-equilibrium analysis of the power balance of the ACR’s cavity detector. An error analysis is carried out on the quasi-equilibrium equation to determine the uncertainties of ACR measurements relative to the absolute radiation scale. The uncertainty of ACR measurements as a function of irradiance level is presented in graphical form.

© 1973 Optical Society of America

Original Manuscript: September 15, 1972
Published: April 1, 1973

Richard C. Willson, "Active Cavity Radiometer," Appl. Opt. 12, 810-817 (1973)

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  1. F. Haley, “A Rapid Response Blackbody Cavity Radiometer,” JPL New Technology Rept. 30-521 (Jet Propulsion Laboratory, Pasadena, Calif., 1964).
  2. J. A. Plamondon, J. M. Kendall, “A Cavity-Type, Absolute Total Radiation Radiometer,” Space Programs Summary 37-35 (Jet Propulsion Laboratory, Pasadena, Calif., 1965), Vol. 4.
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  9. R. C. Willson, J. Geophys. Res. 76, 4325 (1971). [CrossRef]
  10. R. C. Willson, “New Radiometric Techniques,” presented at the International Solar Energy Society Meeting, Goddard Space Flight Center, Greenbelt, Md. (May, 1971).
  11. R. C. Willson, Nature, 239, 208 (1972). [CrossRef]
  12. R. C. Willson, Solar Energy, 14, 203 (1973). [CrossRef]

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