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Combining the spectral information of dual-band images to enhance contrast and reveal details

: Quirin, Steven; Herrmann, Hans-Georg

Maierhofer, Christiane (Hrsg.) ; Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin:
14th Quantitative InfraRed Thermography Conference, QIRT 2018 : Berlin, 25-29 June 2018
Berlin: DGZfP, 2018 (DGZfP-Berichtsbände 167)
ISBN: 978-3-940283-94-8
Paper Tu.5.B.1
Quantitative InfraRed Thermography Conference (QIRT) <14, 2018, Berlin>
Conference Paper
Fraunhofer IZFP ()

A method to calculate an emissivity image out of two thermographic images taken at different wavelengths has been developed. Main part is a thermal pixel to pixel calibration to make measurements physically comparable. The new image shows enhanced contrast in several nondestructive testing situations and reveals details that could not be accessed in the input images. Examples for passive and active thermography are presented using an infrared dual-band camera working simultaneously in the MWIR and LWIR band. Reflection characteristics of CFRP and its components apparent in thermography have been compared with reflectance spectroscopy measurements.