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Comparison of Two Cryogenic Radiometers at NIST.

J M Houston1, D J Livigni2

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-8442.

Journal of Research of the National Institute of Standards and Technology
|August 9, 2016
PubMed
Summary
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Two National Institute of Standards and Technology (NIST) cryogenic radiometers were compared using visible lasers. The instruments showed agreement in calibrating photodiode trap detectors, confirming measurement consistency.

Area of Science:

  • Metrology
  • Optical Physics
  • Radiometry

Background:

  • Accurate spectral responsivity calibration is crucial for photodetector applications.
  • National Institute of Standards and Technology (NIST) maintains primary standards for optical radiation measurements.

Purpose of the Study:

  • To compare the performance of two NIST cryogenic radiometers.
  • To validate the spectral responsivity calibration capabilities of NIST's Optical Technology and Optoelectronics Divisions.

Main Methods:

  • Comparison of two NIST cryogenic radiometers at three visible laser wavelengths.
  • Calibration of photodiode trap detectors for spectral responsivity using each radiometer.
  • Analysis of calibration results within expanded uncertainties (k = 2).
Keywords:
cryogenic radiometerelectrical substitution radiometrysilicon photodiodetrap detector

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Main Results:

  • The two NIST cryogenic radiometers yielded consistent calibration values for spectral responsivity.
  • The agreement between the trap detectors' calibration values was within the expanded uncertainty.

Conclusions:

  • The comparison demonstrates the reliability and agreement of NIST's cryogenic radiometers for spectral responsivity calibrations.
  • This validates the measurement capabilities of both the Optical Technology and Optoelectronics Divisions.