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Proceedings Paper

Image Processing Software For Real Time Quantitative Infrared Thermography
Author(s): Paul Hughett; Elizabeth A. Fuchs
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Paper Abstract

True temperature can be determined from infrared thermography provided the material emissivity and ambient irradiance are known. The measurement equations found in the literature are valid only if the scanner response is linear in radiance. Other complications arise if the emissivity depends on temperature. Spectral (or band) rather than total emissivity values should be used but are less often found in the literature. A new method, specimen calibration, avoids these problems by determining a calibration curve specific to the specimen and experimental arrangement. The computer program VDAS (Video Data Analysis System) automates the collection of calibration data, reduction to a calibration curve, and temperature measurement using the curve. The new method was tested on nylon 6/6 between 20 and 160° C and on 304L stainless steel between 30 and 500° C and was found to be significantly more accurate.

Paper Details

Date Published: 11 May 1987
PDF: 8 pages
Proc. SPIE 0780, Thermosense IX: Thermal Infrared Sensing for Diagnostics and Control, (11 May 1987); doi: 10.1117/12.940512
Show Author Affiliations
Paul Hughett, Hughett Research (United States)
Elizabeth A. Fuchs, Sandia National Laboratories (United States)

Published in SPIE Proceedings Vol. 0780:
Thermosense IX: Thermal Infrared Sensing for Diagnostics and Control
Robert P. Madding, Editor(s)

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