Journal
NDT & E INTERNATIONAL
Volume 100, Issue -, Pages 101-107Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2018.09.003
Keywords
Active thermography; Photothermal technique; Virtual wave concept; Parameter estimation; Inverse problem; Regularization
Funding
- Austrian Federal Ministry of Science, Research and Economy
- National Foundation for Research, Technology and Development
- federal government of Upper Austria
- European Regional Development Fund (EFRE)
- project multimodal and in-situ characterization of inhomogeneous materials (MiCi)
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The aim of this work is the estimation of the specimen thickness from pulsed thermography data using the virtual wave concept. A virtual wave signal is calculated by applying a local transformation to the measured temperature data. This virtual wave is a solution of the wave equation, whereby for the parameter estimation also ultrasonic evaluation methods can be used, e.g. pulse-echo method for time-of-flight measurements. The time-of-flight is directly related to the distance traveled by the wave and can be used to reconstruct the position of the interface. This method yields a very good estimation of the thickness of a steel step wedge, with the advantage that the same evaluation method can be used for reflection as well as transmission measurements.
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