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An International Comparison of Absolute Radiant Power Measurement Capabilities.

Douglas B Thomas1

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

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PubMed
Summary

Eleven national laboratories compared their monochromatic radiant power measurement capabilities using silicon photodiode radiometers. Results showed excellent agreement, with a standard deviation of 0.36% at 633 nm and 488 nm.

Keywords:
absolute spectral responseintercomparisonlaser powerphotodetectorradiant powerradiometrysilicon photodiodes

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Area of Science:

  • Metrology
  • Optical Radiation Measurement
  • Photometry

Background:

  • Accurate measurement of monochromatic radiant power is crucial for various scientific and industrial applications.
  • Intercomparisons are essential for validating and harmonizing measurement capabilities among national laboratories.

Purpose of the Study:

  • To compare the monochromatic radiant power measurement capabilities of 11 national metrology institutes.
  • To assess the agreement and uncertainty of silicon photodiode-based radiometer measurements at specific wavelengths.

Main Methods:

  • An intercomparison was conducted using pairs of radiometers, each comprising a precision amplifier and silicon photodiodes (pn or np-type).
  • Eleven laboratories measured absolute responsivity at 633 nm, and nine at 488 nm.
  • Data analysis focused on the standard deviation of the differences between participants and agreement with reference values.

Main Results:

  • The standard deviation of the overall difference in responsivity measurements was 0.36% at both 633 nm and 488 nm.
  • Agreement between participating laboratories and the National Institute of Standards and Technology (NIST) was within stated measurement accuracies.
  • The study demonstrated high consistency in monochromatic radiant power measurements across different national laboratories.

Conclusions:

  • The intercomparison confirmed the high level of agreement and reliability of monochromatic radiant power measurements among participating national laboratories.
  • Silicon photodiode radiometers are effective tools for precise radiant power determination at key wavelengths.
  • The results support the traceability and comparability of optical radiation measurements globally.