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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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Integrating sphere port error in diffuse reflectance measurements.

Luke J Sandilands, Thomas Cameron

    Applied Optics
    |October 19, 2023
    PubMed
    Summary

    Finite integrating sphere port thickness causes light loss, underestimating diffuse reflectance measurements. This study quantifies the error using Monte Carlo simulations and experiments, offering strategies to minimize this measurement inaccuracy.

    Area of Science:

    • Optical Metrology
    • Spectrophotometry
    • Radiometry

    Background:

    • Integrating spheres are crucial for diffuse reflectance measurements.
    • Finite port thickness can introduce systematic errors in optical measurements.
    • Accurate diffuse reflectance is vital in material science and colorimetry.

    Purpose of the Study:

    • To investigate the impact of finite integrating sphere port thickness on diffuse reflectance measurements.
    • To quantify the light loss and resulting measurement error.
    • To explore factors influencing this error and propose mitigation strategies.

    Main Methods:

    • Combined numerical (Monte Carlo ray tracing) and experimental approach.
    • Utilized integrating sphere reflectometers with varying port geometries.

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  • Analyzed effects of sample reflectance, port dimensions, and illumination size.

    • Main Results:

    • Finite port thickness leads to underestimation of diffuse reflectance due to scattering losses.
    • Monte Carlo simulations accurately predicted measurement errors.
    • Experimental data validated the numerical findings across different port geometries.

    Conclusions:

    • Finite integrating sphere port thickness is a significant, often overlooked, source of measurement error.
    • Understanding and quantifying these losses is essential for accurate diffuse reflectance determination.
    • Strategies exist to minimize this error in integrating sphere designs and usage.