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  3. Measurement Of 0/45 Reflectance Factor Using Nonlinearity Corrected Array Spectroradiometer.
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  3. Measurement Of 0/45 Reflectance Factor Using Nonlinearity Corrected Array Spectroradiometer.

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Measurement of 0/45 reflectance factor using nonlinearity corrected array spectroradiometer.

Zhifeng Wu, Shize Wang, Xiaofeng Lu

    Optics Express
    |February 20, 2026

    View abstract on PubMed

    Summary
    This summary is machine-generated.

    Accurate reflectance factor measurement requires system linearity. This study presents an optical setup for precise reflectance and linearity calibration, minimizing uncertainty for array spectroradiometers.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Spectroradiometry

    Background:

    • Reflectance factor measurement spans wide dynamic ranges, necessitating highly linear systems for accuracy.
    • Existing methods face challenges with nonlinearity and spectral stray light, impacting measurement uncertainty.

    Purpose of the Study:

    • To describe an optical configuration for reflectance factor measurement.
    • To enable linearity measurement within the same setup.
    • To minimize measurement uncertainty in reflectance factor determination.

    Main Methods:

    • Developed a linearity calibration facility integrating a blackbody source, aperture, and white diffuser.
    • Ensured spectral radiance and distribution match reflectance factor measurements from an integrating sphere.
  • Modified an optical configuration for both reflectance factor and linearity assessment.

    • Main Results:

    • The calibration facility achieves spectral radiance ranges identical to integrating sphere light sources.
    • The setup significantly reduces nonlinearity and spectral stray light impacts.
    • Achieved 0/45 reflectance factor measurement uncertainty of 1.20%-0.54% (k=2) for white diffuse targets from 380-780 nm.

    Conclusions:

    • The described optical configuration provides a convenient and accurate method for reflectance factor measurement using array spectroradiometers.
    • The integrated linearity calibration minimizes uncertainty, enhancing the reliability of spectral measurements.
    • This approach offers improved accuracy for diffuse reflectance measurements across the visible spectrum.