Spectrally transmissive IR windows: how they affect your thermography results

Robert P. Madding

doi:10.1117/12.605365

28 March 2005 Spectrally transmissive IR windows: how they affect your thermography results

Robert P. Madding

Proceedings Volume 5782, Thermosense XXVII; (2005) https://doi.org/10.1117/12.605365
Event: Defense and Security, 2005, Orlando, Florida, United States

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.

Citation Download Citation

Robert P. Madding "Spectrally transmissive IR windows: how they affect your thermography results", Proc. SPIE 5782, Thermosense XXVII, (28 March 2005); https://doi.org/10.1117/12.605365

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