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The sizing of fibres using optical scattering

D J Somerford, S R Powers

    IARC Scientific Publications
    |January 1, 1980
    PubMed
    Summary

    Fraunhofer diffraction accurately models light scattering from absorbing cylinders down to 4 micrometers. A Fourier transform inversion method determines fibre width size distribution without initial calibration.

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    Area of Science:

    • Optics
    • Materials Science
    • Nanotechnology

    Background:

    • Light scattering is crucial for characterizing materials.
    • Fraunhofer diffraction is a well-established optical phenomenon.
    • Accurate measurement of fibre size distribution is important in various industries.

    Purpose of the Study:

    • To investigate the applicability of Fraunhofer diffraction for absorbing cylinders.
    • To develop a simple inversion procedure for determining fibre size distribution.
    • To assess the method's effectiveness for sub-micrometer fibres.

    Main Methods:

    • Analyzing light scattering patterns from absorbing cylinders using Fraunhofer diffraction.
    • Applying a Fourier transform-based inversion technique to scattering data.
    • Utilizing electron micrographs as scattering objects for sub-micrometer fibres.

    Main Results:

    • Fraunhofer diffraction adequately describes scattering for cylinders ≥ 4 micrometers at 632.8 nm wavelength.
    • The inversion procedure successfully retrieves fibre width size distribution.
    • The method is applicable to both aligned and unaligned fibres.
    • No initial calibration is necessary for the size distribution analysis.

    Conclusions:

    • Fraunhofer diffraction and Fourier transform inversion offer a robust method for fibre size distribution analysis.
    • This technique is effective for a range of fibre sizes, including sub-micrometer scales.
    • The direct, calibration-free nature of the method enhances its practical utility.

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