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Evaluation of anomaly detection capabilities using a non-orthogonal camera angle in pulse-phase thermography

Bretz, Lucas ORCID iD icon 1; Hinze, Torben 1; Häfner, Benjamin 1; Lanza, Gisela 1
1 Institut für Produktionstechnik (WBK), Karlsruher Institut für Technologie (KIT)


Pulse-phase thermography (PPT) is widely used to nondestructively inspect internal defects in fiber reinforced polymers. However, the challenges using PPT for complex shapes is poorly documented in literature. Only small changes in the object distance have been considered. Complex parts can have significant variations in object distance and thus, in detected radiation. In this contribution, the effect of a non-orthogonal camera angle with respect to a flat sample, leading to varying object distances and an inhomogeneous sound background area in phasegrams, is investigated. Samples with artificial round and square defects of different sizes are positioned under varying angles with respect to the camera, representing geometric properties of complex parts. The construction of the thermographic system and the experimental setup to systematically vary the angle between camera and specimen is presented. We investigated the change of the signal-to-noise ratio (SNR) of artificial delaminations in PPT measurements under varying object distances. The SNR in a distance of 136 mm out of the focal plane is sufficiently high for image feature extraction. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000127412
Veröffentlicht am 09.12.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Produktionstechnik (WBK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2212-8271
KITopen-ID: 1000127412
Erschienen in Procedia CIRP
Verlag Elsevier
Band 85
Seiten 308–313
Bemerkung zur Veröffentlichung 2nd CIRP Conference on Composite Material Parts Manufacturing, CIRP-CCMPM 2019; Advanced Manufacturing Research CentreSheffield, United Kingdom; 10 - 11 October 2019
Vorab online veröffentlicht am 30.12.2019
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