Development of Measurement System for Bidirectional Reflectance/Transmittance Using a Paraboloidal Mirror

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  • Nakamura Kae
    Dept. of Mechanical Engineering, Fac. of Engineering, Shibaura Institute of Technology
  • Yamada Jun
    Dept. of Mechanical Engineering, Fac. of Engineering, Shibaura Institute of Technology

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Other Title
  • 回転放物面鏡を用いた２方向反射率・透過率測定システム
  • カイテン ホウブツメンキョウ オ モチイタ 2 ホウコウ ハンシャリツ ・ トウカリツ ソクテイ システム

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Abstract

A measurement system for bidirectional reflectance/transmittance using a paraboloidal mirror and a CCD camera has been proposed. In this system, diffusely reflected and/or transmitted light on a measurement sample are reflected by the paraboloidal mirror and are then projected to a screen. An intensity profile of the light on the screen is measured by CCD camera. Based on this intensity profile of the light on the screen, the directional intensity profile of the reflected and/or transmitted light from the sample is evaluated. The bidirectional reflectance/transmittance of the sample is estimated as a ratio of this light intensity from the sample to that from a perfectly diffuse reflector. The detail of the present system is shown first, and the validity of the system is evaluated by comparing the measurement results by the present system with those by a conventional system in bidirectional transmittance. Furthermore, we demonstrated that the present system is useful to measure the bidirectional reflectance/transmittance of a particle layer, which it is difficult to measure using conventional systems.

Journal

  • Netsu Bussei

    Netsu Bussei 30 (1), 18-26, 2016

    JAPAN SOCIETY OF THERMOPHYSICAL PROPERTIES

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