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The 1990 NIST Scales of Thermal Radiometry.

Klaus D Mielenz1, Robert D Saunders1, Albert C Parr1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899.

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Summary

NIST updated its temperature calibration scales using thermal radiometry, aligning with the International Temperature Scale of 1990 (ITS-90). These changes improve accuracy and consistency in radiometric measurements without altering reported values beyond uncertainty.

Keywords:
blackbody physicscalibrationsgold pointmeasurement scalesphotometrypyrometryradiation temperatureradiometrytemperature scales

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Area of Science:

  • Metrology
  • Thermodynamics
  • Optical Physics

Background:

  • The International Temperature Scale of 1990 (ITS-90) is a standard for temperature calibration.
  • NIST previously used gold point measurements for temperature calibration.
  • Advancements in thermal radiometry enable new measurement scales.

Purpose of the Study:

  • To define and compare new NIST thermal radiometry-based measurement scales with ITS-90.
  • To quantitatively assess the impact of these new scales on NIST calibration services.
  • To evaluate changes in accuracy and consistency of radiometric measurements.

Main Methods:

  • Defining new measurement scales based on thermal radiometry.
  • Comparing new scales against the International Temperature Scale of 1990 (ITS-90).
  • Quantitatively analyzing calibration data for optical pyrometry, radiometry, and photometry.

Main Results:

  • New NIST measurement scales are defined and compared to ITS-90.
  • Changes in calibration values are within stated uncertainties.
  • Small improvements in accuracy and consistency with other radiometric scales were observed.

Conclusions:

  • NIST's adoption of new thermal radiometry scales is consistent with ITS-90.
  • The updated scales enhance the accuracy and consistency of NIST's radiometric calibration services.
  • The transition to new scales ensures continued high-quality metrology services.