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Continuous and Laplace transformable approximation for the temporal pulse shape of Xe-flash lamps for flash thermography

  • Flash thermography is widely used in non-destructive testing and materials characterisation. The use of analytical modelling utilizing the Laplace transform allows one to calculate the temperature transients of flash-heated samples and therefore characterize them by fitting of the results of model calculations to experimental data. However, for samples with high thermal diffusivity or very thin samples, the temperature transient is strongly influenced by the temporal shape of the heating pulse, especially in reflection configuration. To incorporate this into the model, the temporal shape of the heating pulse and its Laplace transform have to be known. Here we present a close phenomenological approximation of the temporal shape of pulses of Xe-flash lamps. It is a non-stitched solution, has a simple Laplace transform and is suitable for different lamps and energy settings. As an example for a practical application of the pulse shape approximation, we use it to determine the thickness ofFlash thermography is widely used in non-destructive testing and materials characterisation. The use of analytical modelling utilizing the Laplace transform allows one to calculate the temperature transients of flash-heated samples and therefore characterize them by fitting of the results of model calculations to experimental data. However, for samples with high thermal diffusivity or very thin samples, the temperature transient is strongly influenced by the temporal shape of the heating pulse, especially in reflection configuration. To incorporate this into the model, the temporal shape of the heating pulse and its Laplace transform have to be known. Here we present a close phenomenological approximation of the temporal shape of pulses of Xe-flash lamps. It is a non-stitched solution, has a simple Laplace transform and is suitable for different lamps and energy settings. As an example for a practical application of the pulse shape approximation, we use it to determine the thickness of polymer samples with thicknesses down to 80 µm by means of flash thermography, both in transmission and reflection configuration. Using a rectangular pulse shape or a delayed Dirac pulse shape, the thickness results are very sensitive to the start time of the fit and an additional calibration is needed.zeige mehrzeige weniger

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Metadaten
Autor*innen:Simon AltenburgORCiD, Rainer KrankenhagenORCiD
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Quantitative InfraRed Thermography Journal
Jahr der Erstveröffentlichung:2017
Verlag:Taylor and Francis
Verlagsort:Abingdon, UK
Jahrgang/Band:15
Ausgabe/Heft:1
Erste Seite:121
Letzte Seite:131
DDC-Klassifikation:Naturwissenschaften und Mathematik / Chemie / Analytische Chemie
Freie Schlagwörter:Finite pulse length; Flash thermography; Laplace transform; NDT; Pulse shape; Thickness determination
DOI:10.1080/17686733.2017.1383765
ISSN:1768-6733
ISSN:2116-7176
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:09.10.2017
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:12.04.2018
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