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Absolute solar transmittance interferometer for ground-based measurements | JoVE Visualize

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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

View abstract on 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.

Area of Science:

Atmospheric Physics
Spectroscopy
Radiometry

Background:

Accurate measurement of solar radiance is crucial for climate modeling and atmospheric studies.
Existing methods may have limitations in absolute calibration and spectral range.

Purpose of the Study:

To develop and validate an absolute solar transmittance interferometer for precise solar radiance measurements.
To assess the instrument's performance and uncertainties.

Main Methods:

Utilized a Fourier-transform spectrometer with a liquid-nitrogen-cooled InSb detector.
Calibrated spectra using NIST-traceable lamps and a blackbody source.
Operated within a spectral range of 1950–10100 cm⁻¹ at 2 cm⁻¹ resolution.

Main Results:

The interferometer successfully measured absolute solar radiance.
Instrument uncertainties and calibration source impacts were analyzed.
Initial measurements showed good agreement with atmospheric model predictions.

Conclusions:

The developed interferometer provides accurate absolute solar radiance measurements.
The instrument is suitable for atmospheric research and validation studies.
Further intercomparisons and site measurements are warranted.

Astronomical Sciences

Absolute Solar Transmittance Interferometer For Ground-based Measurements