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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 19, Iss. 11 — Jun. 1, 1980
  • pp: 1798–1803

Performance of fused silica as a filter in a wide field-of-view earth radiation budget radiometer

John E. Cooper and Michael R. Luther  »View Author Affiliations


Applied Optics, Vol. 19, Issue 11, pp. 1798-1803 (1980)
http://dx.doi.org/10.1364/AO.19.001798


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Abstract

An analysis of the thermal response of a fused silica hemispherical dome filter in a wide field-of-view (WFOV) shortwave radiometer for obtaining earth radiation budget measurements is presented. The impact of the filter thermal response on the dc detector (a thermopile) and on the resulting measurement uncertainty is evaluated. It is shown that the hemispherical filter material maintains neither a uniform nor constant temperature distribution as it responds to changes in the radiation emitted from earth. Accurate determination of terrestrial shortwave irradiance requires knowledge of the dome filter thermal response because the thermopile responds to changes in the dome temperature as well as the shortwave scene. Data are presented that show that variations in the dome temperature distribution from calibration conditions can result in a measurement uncertainty of several W/m2 if not properly accounted for in the interpretation of the measurement. Design approaches, ground calibration, and data reduction techniques that can reduce this measurement uncertainty by an order of magnitude are presented.

© 1980 Optical Society of America

History
Original Manuscript: June 1, 1979
Published: June 1, 1980

Citation
John E. Cooper and Michael R. Luther, "Performance of fused silica as a filter in a wide field-of-view earth radiation budget radiometer," Appl. Opt. 19, 1798-1803 (1980)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-19-11-1798


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References

  1. J. E. Cooper, C. V. Woerner, “The Earth Radiation Budget Satellite System of the Early 1980s,” in Proceedings, Fourth Symposium on Meteorological Observations and Instrumentation, Denver, 10–14 Apr. 1978.
  2. J. E. Cooper, C. V. Woerner, “System Implementation for Earth Radiation Budget Satellite System,” at Third Conference on Atmospheric Radiation, Davis, Calif., 28–30 June 1978.
  3. J. R. Mahan, M. R. Luther, “Thermal Model of a Filtered Radiometer,” at Third Conference on Atmospheric Radiation, Davis, Calif., 28–30 June 1978.
  4. G. G. Campbell and T. H. Vonder Haar of Colorado State U. developed for NASA Langley Research Center under contract NAS1-12106, a computer program capable of simulating the earth's reflected and emitted radiation as a function of time and space based on Nimbus 3 measurements.
  5. T. H. Vonder Haar, W. H. Wallschlaeger, “Design Definition Study of the Earth Radiation Budget Satellite System,” NASA CR-158934 (Aug.1978).

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