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Start Over Author "Liebmann F" Topic radiation pyrometers
2 results on '"Liebmann F"'

1. Radiation thermometer size-of-source effect testing using aperture.

Author

Liebmann, F. and Kolat, T.

Subjects
*RADIATION pyrometers, *MATHEMATICAL variables, *MATHEMATICS, *DATA acquisition systems, *INTERPOLATION
Abstract

Size-of-source effect is an important attribute of any radiation thermometer. The effects of this attribute may be quantified in a number of different ways to include field-of-view, distance ratio, or size-of-source effect. These parameters provide needed information for the user of a radiation thermometer, as they aid in determining whether the measured object is large enough for adequate radiation thermometry measurement. Just as important, these parameters provide needed information for calibration. This information helps to determine calibration geometry, and it is needed for calibration uncertainty determination. For determination of size-of-source effect, there are a limited number of test methods furnished by the standards available today. The test methods available may be cumbersome to perform due to the cost of the required equipment and the time needed to set-up and perform the test. Other methods have been proposed. This paper discusses one such method. This method uses a circular aperture such as that used in radiation thermometer calibration. It describes the method both theoretically and mechanically. It then discusses testing done to verify this method comparing the results to those obtained while performing steps in current standards. Finally, based on this testing, the basis for a new standard test method is presented. [ABSTRACT FROM AUTHOR]

Published
2013
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2. Radiometic Comparison Between a National Laboratory and an Industrial Laboratory.

Author

Liebmann, F., Kolat, T., Coleman, M., and Wiandt, T.

Subjects
*BRIGHTNESS temperature, *RADIATION measurements, *CALIBRATION, *RADIATION pyrometers, *PYROELECTRIC detectors, *TEMPERATURE measurements
Abstract

One of the disciplines that Fluke-Hart Scientific has is radiometric calibration. Part of this program involves use of a radiation thermometer with a pyroelectic detector. It is used as a radiometric transfer standard between a set of liquid-bath variable temperature blackbodies and a flat-plate infrared (IR) calibrator. The flat-plate calibrator is designed for use in the calibration of handheld IR thermometers. The traceability of the variable temperature blackbodies is realized by contact thermometry through the National Institute of Standards and Technology (NIST). A verification of these blackbodies is a comparison between a calibration done by the Radiance Temperature Laboratory at NIST and the blackbodies at Fluke-Hart Scientific. This comparison uses a transfer radiation thermometer (TRT) as a check standard. It would be more desirable to use radiometric traceability as an indication of the blackbodies' radiometric temperature. However, contact thermometry provides much better uncertainties. These uncertainties are needed for the radiometric transfer from the blackbodies to the flat-plate calibrators. Thus, the NIST radiometric calibration of the TRT is used for verification of normal equivalence. This article discusses Fluke-Hart Scientific's blackbody traceability. It covers the Fluke-Hart Scientific and the NIST radiometric calibration procedures. It discusses the radiometric uncertainty budgets at both Fluke-Hart Scientific and at NIST. It then discusses the results of this comparison and analyzes the results. The comparison is in the temperature range of −15 °C to 500 °C. It showed a normal equivalence of less than 1.00 at all points. The article concludes with a set of future actions to ensure quality in Fluke-Hart Scientific's radiometric calibration program. [ABSTRACT FROM AUTHOR]

Published
2011
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