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Related Experiment Video

Updated: Jun 14, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

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Published on: July 1, 2019

Diffusers in silicon-photodiode radiometers.

L P Boivin1

  • 1National Research Council of Canada, Division of Physics, Ottawa, Ontario KiA OR6.

Applied Optics
|April 8, 2010
PubMed
Summary
This summary is machine-generated.

Radiometric measurements using silicon photodiode radiometers are improved by a new diffuserless head design or by incorporating specific diffusers. Quartz diffusers offer the best performance for most applications, despite a narrower field of view.

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Area of Science:

  • Optical Engineering
  • Radiometry
  • Photometry

Background:

  • Silicon photodiode radiometers without diffusers face challenges in radiometric measurements, particularly with laser beams.
  • Existing methods often struggle with accuracy and consistency in diverse lighting conditions.

Purpose of the Study:

  • To address problems in radiometric measurements with diffuserless silicon photodiode radiometers.
  • To evaluate diffuser head designs for improved measurement accuracy and stability.
  • To compare the performance of different diffuser materials.

Main Methods:

  • Development of a novel diffuserless radiometer head design.
  • Characterization of radiometer heads incorporating flashed opal, translucent Plexiglas, and ground quartz diffusers.
  • Analysis of spatial uniformity, angular response, and spectral attenuation for each diffuser type.

Main Results:

  • The diffuserless design effectively mitigates common radiometric measurement issues.
  • Quartz diffusers demonstrate superior spatial uniformity and angular response compared to opal and Plexiglas.
  • All tested diffusers exhibit spectral attenuation, with quartz showing favorable characteristics for broad applications.

Conclusions:

  • A diffuserless design or the use of appropriate diffusers significantly enhances radiometric measurements.
  • Ground and etched quartz diffusers are recommended for most radiometric and photometric applications due to their performance.
  • The choice of diffuser impacts the field of view, with quartz offering a more limited but often acceptable range.