Automated Calibration of a Five-color High-speed Radiometer

Report No. ARL-TN-0507
Authors: Alejandro Perdomo and Willard Casey Uhlig
Date/Pages: October 2012; 24 pages
Abstract: Radiation pyrometry or radiometry correlates the radiation emitted by a body to its temperature using Planck's radiation law. Radiometers are ideal for high-speed events in which direct optical observation can be obtained. Multichannel radiometers eliminate the requirement of a measured emissivity and allow the attainment of measurement uncertainty as well as temperature. However, calibration of such systems is crucial, and because large amounts of data are required, calibration can be a time-consuming process. Here we present a LabTalk script that automatically calibrates the data and determines certain values such as the frequency and amplitudes. The calibration process includes finding the ratios of light emitted at different wavelengths and comparing the natural log of those ratios to the inverse of the temperatures. The script is for the program OriginLab, a data analysis and graphing software that created LabTalk specifically for OriginLab, and is similar to the programming language C.
Distribution: Approved for public release
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Last Update / Reviewed: October 1, 2012