Proposal of quantitative temperature measurements using two-color technique combined with several infrared radiometers having different detection wavelength bands

Terumi Inagaki; Toshimitsu Ishii

doi:10.1117/1.1349218

1 March 2001 Proposal of quantitative temperature measurements using two-color technique combined with several infrared radiometers having different detection wavelength bands

Terumi Inagaki, Toshimitsu Ishii

Author Affiliations +

Optical Engineering, Vol. 40, Issue 3, (March 2001). https://doi.org/10.1117/1.1349218

Infrared thermography has been widely used to visualize a two-dimensional temperature field for various engineering applications. However, in general, conventional infrared thermography cannot directly be applied to quantitative temperature measurement on glossy metal surfaces under near-ambient conditions, because of the severe influence of the reflected energy incident from the surroundings on the measurement. When it is necessary to measure the temperature quantitatively, an appropriate calibration involving complicated procedures must be performed. In this paper, therefore, a new technique of measuring temperature is proposed for near-ambient conditions, by combining simultaneously several infrared radiometers having different detection wavelength bands to enable a two-color technique, which does not require any temperature calibrations. The sensors concerned have a selective wavelength band of several micrometers in width in the range of 2 to 13 ?m. The applicability of the method, including a series of proposed equations, has been confirmed by an investigation; the numerical simulation presented merely allows a parametric study of how the result varies for different values of emissivity corresponding to a pair of infrared radiometers. An experimental investigation is also performed to estimate or correct the measurement error pertaining to the present technique. This technique has the feature that a two-dimensional temperature field can be evaluated quantitatively, nondestructively, and simultaneously at each picture element without presuming any emissivity and reflectivity, even though the object has a complicated shape; so that it may be useful in various medical or engineering applications.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Terumi Inagaki and Toshimitsu Ishii "Proposal of quantitative temperature measurements using two-color technique combined with several infrared radiometers having different detection wavelength bands," Optical Engineering 40(3), (1 March 2001). https://doi.org/10.1117/1.1349218

Published: 1 March 2001

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