Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 101-107 |
| Number of pages | 7 |
| Journal | NDT and E International |
| Volume | 100 |
| DOIs | |
| Publication status | Published - Dec 2018 |
Keywords
- Active thermography
- Inverse problem
- Parameter estimation
- Photothermal technique
- Regularization
- Virtual wave concept
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