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Absolute solar transmittance interferometer for ground-based measurements.

Toufic Hawat1, Thomas Stephen, Frank Murcray

  • 1Department of Physics and Astronomy, University of Denver, Colorado 80208, USA. thawat@du.edu

Applied Optics
|June 25, 2002
PubMed
Summary

This study introduces an absolute solar transmittance interferometer for measuring solar radiance. Initial measurements align with atmospheric model calculations, validating the instrument's performance.

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Area of Science:

  • Atmospheric Physics
  • Spectroscopy
  • Radiometry

Background:

  • Accurate measurement of solar radiance at Earth's surface is crucial for climate and atmospheric studies.
  • Existing methods may have limitations in absolute accuracy and spectral range.

Purpose of the Study:

  • To develop and validate an instrument for precise absolute solar radiance measurements.
  • To assess the instrument's performance through calibration and comparison with atmospheric models.

Main Methods:

  • Utilized a Fourier-transform spectrometer with a liquid-nitrogen-cooled InSb detector.
  • Employed National Institute of Standards and Technology (NIST) traceable lamps and a blackbody source for calibration.
  • Operated within a spectral range of 1950 to 10100 cm(-1) at 2 cm(-1) resolution.

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Main Results:

  • The absolute solar transmittance interferometer was successfully designed and implemented.
  • Calibration procedures established traceability to standards.
  • Initial measurements demonstrated good agreement with atmospheric model predictions.

Conclusions:

  • The developed interferometer is a reliable tool for absolute solar radiance measurements.
  • The instrument's performance is suitable for atmospheric research and validation studies.
  • Further intercomparisons and long-term monitoring are recommended.