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Accurate Measurements of and Corrections for Nonlinearities in Radiometers.

C L Sanders1

  • 1Division of Physics, National Research Council of Canada, Ottawa, Canada K1A OS1.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|September 27, 2021
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Summary

Accurate photocell linearity measurement is crucial for reliable optical measurements. This study assesses existing methods and specifies conditions for precise nonlinearity assessment under working conditions.

Keywords:
Nonlinearityphotocell linearityphotometric accuracyradiation addition method

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Area of Science:

  • Photometry and Radiometry
  • Optical Measurement Science

Background:

  • Photocells are essential optical sensors, but their linearity can significantly impact measurement accuracy.
  • Existing literature presents various methods for assessing photocell linearity, but their applicability and accuracy under working conditions are not always clear.

Purpose of the Study:

  • To survey and critically assess existing methods for measuring photocell linearity.
  • To identify and specify the necessary conditions for accurate photocell linearity assessment under actual operating conditions.
  • To describe the application of a specific instrument for measuring and correcting photocell nonlinearity.

Main Methods:

  • Literature review and critical analysis of photocell linearity measurement techniques.
  • Consideration of the impact of measurement conditions on linearity assessment.
  • Description of the NRC "Photocell Linearity Tester" for practical application.

Main Results:

  • Not all literature methods are suitable for accurate photocell linearity assessment.
  • Specific environmental and operational conditions are critical for valid nonlinearity measurements.
  • The NRC "Photocell Linearity Tester" provides a practical means to measure and correct for photocell nonlinearity.

Conclusions:

  • Accurate photocell linearity assessment requires careful consideration of the operating environment.
  • Standardized conditions and appropriate instrumentation are necessary for reliable photocell performance evaluation.
  • The described methods and tools enable improved accuracy in optical measurements utilizing photocells.