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Optical Engineering

Scope and limitations of thermal imaging using multiwavelength infrared detection
Author(s): Shahram Hejazi; Darold C. Wobschall; Robert A. Spangler; Michael Anbar
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Paper Abstract

In determining temperature of surfaces by their blackbody emission, simultaneous acquisition of infrared emission at different wavelengths can provide a set of parameters needed to compute the absolute temperature of the object. A graybody model can be used to derive a set of equations that correlates the effects of emissivity variation and reflection of ambient radiation on the apparent and true temperatures of the object. Such a model is presented and its sensitivities to noise are evaluated. A four-wavelength digital thermal imager has been constructed to evaluate the practical implementation of the model. Finally, utilizing a phantom that simulates a graybody, and human skin data, the validity of the model has been demonstrated. It is shown that the system noise and the computational errors of series expansion are the factors that limit the precision of the computed temperature.

Paper Details

Date Published: 1 November 1992
PDF: 11 pages
Opt. Eng. 31(11) doi: 10.1117/12.59992
Published in: Optical Engineering Volume 31, Issue 11
Show Author Affiliations
Shahram Hejazi, State Univ. of New York/Buffalo (United States)
Darold C. Wobschall, State Univ. of New York/Buffalo (United States)
Robert A. Spangler, SUNY/Buffalo (United States)
Michael Anbar, SUNY/Buffalo (United States)

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