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Significance of Correction for Detector Temperature in Infrared Emission Spectroscopy

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In the May 1991 issue of this journal, DeBlase and Compton published a comprehensive review bringing together most of the basic knowledge on IR emission spectroscopy available in the literature up to 1988. Discussing the role of the temperature of the sample and detector, the authors show a series of blackbody curves, both computer-generated and measured ones, for different, temperatures and draw the following conclusion:

"The computer-generated blackbody curves... can be used to carry out an internal check of sample temperature spectroscopically. By searching for the best fitted theoretical curve which matches the experimental single-beam spectrum, one can determine the sample temperature during the emission measurement."

The idea is clear but it has not been developed properly, and some important details of the procedure seem to be ignored or overlooked by the authors. In our opinion the above statement is valid with good approximation only if the temperature of the detector is much lower than that of the blackbody. If not, correction for the detector temperature must be made as outlined below.

Keywords: Blackbody radiation; IR emission spectroscopy; Temperature estimation

Document Type: Short Communication


Affiliations: 1: Central Research Institute for Chemistry, Hungarian Academy of Sciences, P.O. Box 17, H-1525 Budapest, Hungary 2: Institute of Isotopes, Hungarian Academy of Sciences, P.O. Box 77, H-1525 Budapest, Hungary

Publication date: November 1, 1992

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