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Uncertainty Propagation for NIST Visible Spectral Standards.

James L Gardner1

  • 1CSIRO National Measurement Laboratory Lindfield, Australia 2070.

Journal of Research of the National Institute of Standards and Technology
|July 2, 2016
PubMed
Summary
This summary is machine-generated.

This study details how uncertainties in National Institute of Standards and Technology (NIST) spectral standards are calculated. It provides a framework for accurate radiometric measurements by accounting for correlations in spectral data.

Keywords:
irradianceradiometryresponsivityuncertainty

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Area of Science:

  • Metrology
  • Optical Engineering
  • Radiometry

Background:

  • Accurate spectral standards are crucial for reliable detector and source characterization.
  • Existing methods for uncertainty propagation in spectral measurements require refinement, especially considering wavelength correlations.

Purpose of the Study:

  • To propagate uncertainties in NIST spectral standards for detectors and sources in the visible range.
  • To detail uncertainty propagation through fitting and transfer spectral measurements.
  • To provide recommendations for interpolating spectral irradiance values.

Main Methods:

  • High accuracy cryogenic radiometer measurements were used as the basis for uncertainty propagation.
  • Partial correlations between spectral values at different wavelengths were estimated.
  • Uncertainty propagation was analyzed through fitting, transfer spectral measurements, and the spectral comparator facility.

Main Results:

  • A comprehensive method for propagating uncertainties in spectral standards, considering correlations, was developed.
  • Detector uncertainties were successfully propagated for external calibrations and internal photometric quantities.
  • Uncertainties in spectral irradiance were derived and propagated to calibrated artifacts.

Conclusions:

  • The developed method provides a robust framework for assessing uncertainties in spectral standards.
  • Accurate estimation of correlations is vital for precise radiometric calculations.
  • Interpolation is recommended over fitting for NIST-provided spectral irradiance values to minimize uncertainty.