Infrared Radiation of Thin Plastic Films

[+] Author and Article Information
C. L. Tien, C. K. Chan

Department of Mechanical Engineering, University of California, Berkeley, Calif.

G. R. Cunnington

Lockheed Palo Alto Research Laboratory, Palo Alto, Calif.

J. Heat Transfer 94(1), 41-45 (Feb 01, 1972) (5 pages) doi:10.1115/1.3449868 History: Received August 10, 1970; Revised June 24, 1971; Online August 11, 2010


A combined analytical and experimental study is presented for infrared radiation characteristics of thin plastic films with and without a metal substrate. On the basis of the thin-film analysis, a simple analytical technique is developed for determining band-averaged optical constants of thin plastic films from spectral normal transmittance data for two different film thicknesses. Specifically, the band-averaged optical constants of polyethylene terephthalate (Mylar, DuPont Co.) and polyimide (Kapton, DuPont Co.) were obtained from transmittance measurements of films with thicknesses in the range of 0.25 to 3 mil. The spectral normal reflectance and total normal emittance of the film side of singly aluminized films are calculated by use of optical constants; the results compare favorably with measured values.

Copyright © 1972 by ASME
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