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Updated: Jan 19, 2026

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International round-robin experiment for angle-resolved light scattering measurement.

A von Finck, T Herffurth, A Duparré

    Applied Optics
    |September 11, 2019
    PubMed
    Summary
    This summary is machine-generated.

    An international study evaluated angle-resolved light scattering measurements. While generally good agreement was found, characterizing volume diffusers proved challenging, and claimed low uncertainties were not consistently supported.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Materials Science

    Background:

    • Standardized measurement of angle-resolved light scattering is crucial for optical component characterization.
    • Existing standards like ASTM E2387-05 provide a framework, with ongoing development for new ISO standards (ISO/WD 19986:2016).

    Purpose of the Study:

    • To test and validate procedures for angle-resolved light scattering measurements through an international round-robin experiment.
    • To assess the agreement between different laboratories and contribute to the development of new international standards.

    Main Methods:

    • Seven international laboratories participated in a round-robin experiment.
    • Measurements were performed on various samples (coated substrates, transparent substrates, diffusers, standards, gratings) across UV, VIS, and NIR spectra.
    • Data analysis was coordinated by Fraunhofer IOF, following ASTM E2387-05 guidelines.

    Main Results:

    • Good to reasonable agreement was observed between laboratories, varying with sample type.
    • Largest deviations occurred at scattering angles near the specular beam.
    • Characterization of volume diffusers presented unexpected challenges.
    • Not all participants adhered to uncertainty reporting guidelines (Guide to the Expression of Uncertainty in Measurement).

    Conclusions:

    • The round-robin experiment highlighted the need for refined procedures in angle-resolved scattering measurements.
    • The study identified specific challenges, particularly with volume diffusers and uncertainty quantification.
    • Results indicate that claimed low measurement uncertainties for specular samples may not be consistently achievable.