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Related Experiment Videos

Multichannel radiometer calibration: a new approach.

Susana Diaz1, Charles R Booth, Roy Armstrong

  • 1Centro Austral de Investigaciones Científicas, Consejo Nacional de Investigaciones Científicas y Técnicas, B. Houssay 200, 9410 Ushuaia, Argentina. subediaz@speedy.com.ar

Applied Optics
|September 16, 2005
PubMed
Summary
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Errors in solar irradiance measurements increase with solar zenith angle (SZA). A new multiregressive method using ozone and SZA significantly improved calibration accuracy for multichannel radiometers, especially at higher latitudes.

Area of Science:

  • Atmospheric science
  • Radiometry
  • Solar energy research

Background:

  • Sun-calibrated multichannel radiometers can exhibit significant errors in irradiance measurements as the solar zenith angle (SZA) increases.
  • This issue is particularly pronounced at mid and high latitudes where large SZAs (>50 degrees) occur annually.
  • Accurate irradiance measurements are crucial for various applications, including climate monitoring and solar energy assessment.

Purpose of the Study:

  • To investigate and mitigate the errors in irradiance measurements from multichannel radiometers caused by increasing solar zenith angles.
  • To develop and validate an improved calibration methodology for these instruments.

Main Methods:

  • A multiregressive methodology was developed, incorporating the total ozone column and SZA into the calibration constant calculation.

Related Experiment Videos

  • Two distinct calibration equations were combined to enhance accuracy across a wider range of SZAs.
  • An independent validation was performed by comparing irradiance data from a multichannel instrument with a spectroradiometer in Ushuaia, Argentina.

    • Main Results:

    • The multiregressive methodology demonstrated a significant improvement in the accuracy of irradiance measurements.
    • Combining the two calibration equations yielded improvements across nearly all tested SZAs.
    • The independent test confirmed the enhanced accuracy of the improved calibration method.

    Conclusions:

    • The proposed multiregressive calibration method effectively reduces errors associated with increasing solar zenith angles in multichannel radiometers.
    • This improved calibration technique enhances the reliability of irradiance data, particularly for instruments deployed at higher latitudes.
    • The findings contribute to more accurate solar radiation monitoring and data analysis in atmospheric and solar energy research.