Parameter estimation from pulsed thermography data using the virtual wave concept

Günther Mayr; Gregor Thummerer; Holger Plasser; Günther Hendorfer; Peter Burgholzer

doi:10.1016/j.ndteint.2018.09.003

Parameter estimation from pulsed thermography data using the virtual wave concept

Günther Mayr, Gregor Thummerer, Holger Plasser, Günther Hendorfer, Peter Burgholzer

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

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 & E INTERNATIONAL
Volume	100
DOIs	https://doi.org/10.1016/j.ndteint.2018.09.003
Publication status	Published - Dec 2018

Keywords

Active thermography
Inverse problem
Parameter estimation
Photothermal technique
Regularization
Virtual wave concept

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10.1016/j.ndteint.2018.09.003

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title = "Parameter estimation from pulsed thermography data using the virtual wave concept",

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.",

keywords = "Active thermography, Inverse problem, Parameter estimation, Photothermal technique, Regularization, Virtual wave concept",

author = "G{\"u}nther Mayr and Gregor Thummerer and Holger Plasser and G{\"u}nther Hendorfer and Peter Burgholzer",

year = "2018",

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doi = "10.1016/j.ndteint.2018.09.003",

language = "English",

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journal = "NDT & E INTERNATIONAL",

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T1 - Parameter estimation from pulsed thermography data using the virtual wave concept

AU - Mayr, Günther

AU - Thummerer, Gregor

AU - Plasser, Holger

AU - Hendorfer, Günther

AU - Burgholzer, Peter

PY - 2018/12

Y1 - 2018/12

N2 - 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.

AB - 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.

KW - Active thermography

KW - Inverse problem

KW - Parameter estimation

KW - Photothermal technique

KW - Regularization

KW - Virtual wave concept

UR - https://doi.org/10.1016/j.ndteint.2018.09.003

U2 - 10.1016/j.ndteint.2018.09.003

DO - 10.1016/j.ndteint.2018.09.003

M3 - Article

SN - 0963-8695

VL - 100

SP - 101

EP - 107

JO - NDT & E INTERNATIONAL

JF - NDT & E INTERNATIONAL

ER -

Parameter estimation from pulsed thermography data using the virtual wave concept

Abstract

Keywords

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