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A spatially resolved in-situ calibration applied to infrared thermography

Elfner, Maximilian 1; Glasenapp, Tobias 1; Schulz, Achmed 1; Bauer, Hans-Jörg 1
1 Institut für Thermische Strömungsmaschinen (ITS), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

When using thermography at elevated ambient temperature levels to determine the surface
temperature of test specimen, radiation reflected on the test surfaces can lead to a large
measurement error. Calibration methods accounting for this amount of radiation are available
in the open literature. Those methods, however, only account for a scalar calibration
parameter. With new, complex test rigs and inhomogeneous reflected radiation distribution, the
need for a spatially resolved calibration arises. Therefore, this paper presents a new correction
method accounting for a spatially varying reflected radiation. By computing a geometrical raytracing, a spatially resolved correction factor is determined. An extended calibration technique
based on an in situ approach is proposed, allowing a local correction of reflected radiation.
This method is applied to a test case with defined boundary conditions. The results are
compared to a well-known in situ calibration method. A major improvement in measurement
accuracy is achieved: the error in calibrated temperature can be reduced from over 10% to
well below 2.5%. This reduction in error is especially prominent when the test surfaces are
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Verlagsausgabe §
DOI: 10.5445/IR/1000096119
Originalveröffentlichung
DOI: 10.1088/1361-6501/ab1db5
Scopus
Zitationen: 10
Web of Science
Zitationen: 8
Dimensions
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 0957-0233, 1361-6501
KITopen-ID: 1000096119
Erschienen in Measurement science and technology
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 30
Heft 8
Seiten Article No. 085201
Vorab online veröffentlicht am 29.04.2019
Schlagwörter thermography, calibration, ray tracing, offset radiation
Nachgewiesen in Web of Science
Scopus
Dimensions
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