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Method of Measuring Diffuse RMS Granularity.

H C Schmitt, J H Altman

    Applied Optics
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    This summary is machine-generated.

    Optical scanners measure semispecular density, but this study shows how to convert it to diffuse density using a factor q. This factor, measurable with existing equipment, is crucial for accurate diffuse granularity assessment.

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    Area of Science:

    • Image analysis
    • Optical metrology
    • Materials science

    Background:

    • Optical scanners typically report granularity in semispecular instrument density.
    • Converting this to diffuse density is essential for accurate material characterization.

    Purpose of the Study:

    • To demonstrate a method for converting semispecular density to diffuse density.
    • To introduce and validate a conversion factor, q, for this purpose.
    • To investigate the behavior of the q factor under various conditions.

    Main Methods:

    • Defined q as the ratio of instrument density to diffuse density.
    • Measured q using two distinct methods, one suitable for routine use.
    • Evaluated the influence of diffuse density and numerical aperture on q.

    Main Results:

    • Established a conversion method from semispecular to diffuse density using the q factor.
    • Identified a practical method for measuring q with existing optical equipment.
    • Observed that q is largely independent of diffuse density at higher levels.
    • Found that q increases significantly with decreasing numerical aperture.
    • Determined that maximum q values occur at moderate sample granularity.

    Conclusions:

    • The q factor provides a reliable means to convert semispecular to diffuse density.
    • The developed measurement method for q is practical for routine use.
    • Understanding the behavior of q is critical for accurate optical granularity measurements, especially concerning system optics and sample properties.