Measurement Of Extinction Coefficients Of Laser-Produced Aluminum Plumes

    Authors

    T. E. Mills; P. J. Bishop;A. Minardi

    Comments

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    Abbreviated Journal Title

    J. Thermophys. Heat Transf.

    Keywords

    Thermodynamics; Engineering, Mechanical

    Abstract

    Radial spectral intensities (0.632 mum) were measured using a He:Ne probe laser scanning an aluminum plume formed by Nd:glass laser irradiation of a target surface. Furthermore, techniques were developed to measure the radial distributions of the extinction coefficients in an axisymmetric, laser-produced aluminum plume. The techniques developed allow for measurements of these distributions as functions of time, wavelength, and elevation above the aluminum target. The extinction coefficients determine the ability of the plasma to attenuate incident laser radiation. The extinction coefficient distribution was determined by scanning a He:Ne probe laser through the plume and converting line-of-sight measurements to a radial distribution. Results indicate that the aluminum plume is optically thin in the first 80 mus after formation and that the radial extinction coefficient profile has a Gaussian distribution.

    Journal Title

    Journal of Thermophysics and Heat Transfer

    Volume

    8

    Issue/Number

    2

    Publication Date

    1-1-1994

    Document Type

    Article

    Language

    English

    First Page

    223

    Last Page

    228

    WOS Identifier

    WOS:A1994NG69600005

    ISSN

    0887-8722

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