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Ultraviolet Spectral Irradiance Scale Comparison: 210 nm to 300 nm.

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|December 24, 2016
PubMed
Summary

Ultraviolet spectral irradiance standards based on different physical principles showed agreement within NIST-assigned uncertainties. This comparison validates diverse methods for accurate UV spectral irradiance measurements between 210 nm and 300 nm.

Keywords:
irradiancespectral irradiancesynchrotron radiationultraviolet radiometryultraviolet standards

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Area of Science:

  • Photometry and Radiometry
  • Spectroscopy
  • Metrology

Background:

  • Accurate spectral irradiance measurements are crucial for various scientific and industrial applications.
  • Establishing reliable ultraviolet (UV) spectral irradiance standards is essential for intercomparability of measurements.
  • Different physical principles underpin various UV spectral irradiance standards.

Purpose of the Study:

  • To compare the performance of different UV spectral irradiance standards.
  • To assess the agreement between standards based on distinct physical principles.
  • To validate the uncertainty assignments provided by NIST for these standards.

Main Methods:

  • Comparison of spectral irradiance measurements from multiple standard sources.
  • Wavelength region investigated: 210 nm to 300 nm.
  • Sources included: electron storage ring, quartz-halogen lamps, deuterium arc lamps, and a windowless argon miniarc.

Main Results:

  • Spectral irradiance measurements from the compared standards showed agreement within their combined standard uncertainties.
  • The agreement was consistent across the investigated UV wavelength range (210 nm–300 nm).
  • NIST-assigned standard uncertainties were found to be appropriate for the compared standards.

Conclusions:

  • Diverse physical principles used in UV spectral irradiance standards can yield consistent and comparable results.
  • The study validates the reliability of the compared standards and their uncertainty evaluations.
  • This intercomparison supports confidence in UV spectral irradiance metrology.