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Stray light correction for solar measurements using array spectrometers.

Axel Kreuter1, Mario Blumthaler

  • 1Department of Physiology and Medical Physics, Division for Biomedical Physics, Innsbruck Medical University, Mullerstrasse 44, 6020 Innsbruck, Austria.

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Summary

This study introduces a new stray light correction method for array spectrometers measuring solar spectra. The validated technique achieves accurate solar spectral measurements down to 307 nm.

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Area of Science:

  • Spectroscopy
  • Atmospheric Science
  • Solar Physics

Background:

  • Stray light in array spectrometers significantly impacts the accuracy of solar spectral measurements.
  • Accurate solar spectral data is crucial for atmospheric studies and solar energy research.
  • Existing stray light correction methods can be complex and computationally intensive.

Purpose of the Study:

  • To develop and validate a simplified stray light matrix correction method for array spectrometers used in solar spectral measurements.
  • To improve the accuracy and reliability of solar spectral data obtained from array spectrometers.
  • To provide a robust method for correcting stray light effects, particularly in the UV and visible spectrum.

Main Methods:

  • A stray light distribution function was approximated using a three-parameter analytical function derived from a single laser line measurement.
  • A stray light correction matrix was generated based on this analytical function.
  • A cutoff filter was employed to adjust an offset parameter, ensuring spectrally flat and near-zero data below a specific wavelength, accounting for IR contribution.
  • The method was validated by intercomparing calibrated solar spectra with data from a double-monochromator spectroradiometer.

Main Results:

  • The developed method effectively corrects stray light in array spectrometers for solar spectral measurements.
  • Validation showed agreement within 5% for calibrated solar spectra down to 307 nm.
  • The method demonstrated accuracy for solar zenith angles smaller than 70 degrees.
  • The simplified approach using only three parameters for the stray light function proved effective.

Conclusions:

  • The presented stray light matrix correction method offers a simplified yet accurate approach for solar spectral measurements using array spectrometers.
  • The technique provides reliable and spectrally flat solar spectra, crucial for various scientific applications.
  • This method enhances the usability of array spectrometers for precise solar radiation monitoring and atmospheric research.