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Proceedings Paper

Spectrally transmissive IR windows: how they affect your thermography results
Author(s): Robert P. Madding
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Paper Abstract

Fluoride-type IR windows have good transmittance in the mid-wave IR band (3 to 5 micrometers). But, their transmittance drops rapidly in the long wave IR band (8 to 12 micrometers). Many low-cost plastic IR windows are also spectral in nature. Thermographers who measure the bandpass transmittance of these windows with their IR cameras may be in for a surprise or erroneous results when the IR window or the target temperature changes. Previous work, Proc. InfraMation 2004, indicates this is not a serious problem for certain target temperature ranges. This paper expands on the model to include effects of IR window thickness, IR window temperature changes and wider target temperatures. If you use low-cost IR windows, you need to know the results of this study.

Paper Details

Date Published: 28 March 2005
PDF: 8 pages
Proc. SPIE 5782, Thermosense XXVII, (28 March 2005); doi: 10.1117/12.605365
Show Author Affiliations
Robert P. Madding, FLIR Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 5782:
Thermosense XXVII
G. Raymond Peacock; Douglas D. Burleigh; Jonathan J. Miles, Editor(s)

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