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Reflectance measurements on cavity radiators.

O C Jones, C Forno

    Applied Optics
    |January 30, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Accurate emissivity measurements for cavity radiators are challenging. Using a helium-neon laser and an integrating sphere method simplifies these measurements for photometric and spectroradiometric standards.

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    Area of Science:

    • Radiometry
    • Optical Engineering
    • Materials Science

    Background:

    • Cavity radiators are crucial for radiometric standards.
    • Determining cavity emissivity from reflectance is complex, especially for small apertures and low reflectance surfaces.
    • Existing measurement techniques can be difficult to implement.

    Purpose of the Study:

    • To investigate a simplified method for measuring the emissivity of cavity radiators.
    • To assess the effectiveness of using a helium-neon laser source for reflectance measurements.
    • To compare different measurement approaches for their suitability in establishing radiometric standards.

    Main Methods:

    • Reflectance measurements were performed on one ceramic and three metallic cavity radiators.
    • A helium-neon (He-Ne) laser was employed as the light source to facilitate measurements.
    • An integrating sphere method was utilized and compared against a goniophotometric approach.

    Main Results:

    • The use of a He-Ne laser significantly facilitated reflectance measurements of cavity radiators.
    • The integrating sphere method proved to be more satisfactory than the goniophotometric approach for these measurements.
    • Emissivity values were successfully deduced for the tested ceramic and metallic cavities.

    Conclusions:

    • A helium-neon laser-based reflectance measurement technique, coupled with an integrating sphere, provides a more satisfactory method for determining cavity radiator emissivity.
    • This approach is suitable for cavities with small apertures and low reflectance, aiding in the development of photometric and spectroradiometric standards.