Improved Liquid-Crystal Thermometry Excluding Human Color Sensation

[+] Author and Article Information
N. Akino, T. Kunugi

Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaragi, 319-11 Japan

K. Ichimiya, K. Mitsushiro

Department of Mechanical Engineering, Yamanashi University, Takeda-4, Kofu, Yamanashi, 400 Japan

M. Ueda

Department of Nuclear Engineering, Kobe University of Mercantile Marine, Kobe-shi, 658 Japan

J. Heat Transfer 111(2), 558-565 (May 01, 1989) (8 pages) doi:10.1115/1.3250714 History: Received March 17, 1987; Online October 20, 2009


A new liquid-crystal thermometry method is described to determine an isothermal map on a heat transfer surface coated with a cholesteric liquid-crystal layer that changes color according to temperature. This method is based on the use of a set of sharp band-pass optical filters, one of which is attached to a black-and-white video camera to take a monochromatic image having a specified color. From the image, an isothermal line was drawn with the aid of a digital image processing technique that excludes human color sensation. We obtain as many isothermal lines as band-pass filters and can determine an isothermal map. An experiment is presented as an application of the present method to measure temperature distributions on a heated surface cooled by air flow and disturbed by a short attached cylinder.

Copyright © 1989 by ASME
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