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Katarzyna Anna Baczynska1, Luke L A Price2, Marina Khazova2

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Measurements from charge-coupled device (CCD) array spectroradiometers can be affected by linearity. This study assessed linearity departures and calculated corrections for four CCD spectroradiometers under various conditions.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Spectroradiometry

Background:

  • Charge-coupled device (CCD) array spectroradiometers are crucial for accurate spectral measurements.
  • Factors such as stray light, dynamic response, and ambient temperature can impact measurement accuracy.
  • Understanding and correcting for non-linearity is essential for reliable spectroradiometric data.

Purpose of the Study:

  • To assess the departure from linearity in four CCD array spectroradiometers.
  • To calculate linearity corrections with standard uncertainty estimates.
  • To investigate the dependence of dynamic response on well depth and integration time.

Main Methods:

  • Utilized a fixed irradiance source with neutral density filters to simulate operational conditions.
  • Evaluated linearity departures across a range of light levels.
  • Analyzed the relationship between dynamic response, well depth, and integration time.

Main Results:

  • One spectroradiometer showed a significant departure from linearity (approximately 20%) near maximum well capacity.
  • Other spectroradiometers exhibited less pronounced departures from linearity.
  • The dynamic response was found to be dependent on well depth and integration time.

Conclusions:

  • Non-linearity is a significant factor affecting CCD array spectroradiometer measurements.
  • Accurate linearity correction is necessary for precise spectral data acquisition.
  • Further investigation into dynamic response parameters is warranted for optimizing spectroradiometer performance.