A normalization procedure for pulse thermographic nondestructive evaluation

Pulse thermographic nondestructive evaluation (TNDE) technique can be used to estimate defect dimensions, and in particular the depth at which the defect is located. Numerical models of this procedure can aid in the interpretation of experimental results. However, the thermophysical properties of th...

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Published inNDT & E international : independent nondestructive testing and evaluation Vol. 83; pp. 14 - 23
Main Authors Sripragash, Letchuman, Sundaresan, Mannur J.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2016
Subjects
Defects
Estimates
Finite Element Analysis
Flaw detection
Instrumentation
Mathematical models
Nondestructive evaluation
Nondestructive testing
Pulse thermographic technique
Signal reconstruction
Thermography
Thermophysical properties
TSR technique
Flaw detection
Finite Element Analysis
Nondestructive evaluation
TSR technique
Pulse thermographic technique
Thermography
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Summary:Pulse thermographic nondestructive evaluation (TNDE) technique can be used to estimate defect dimensions, and in particular the depth at which the defect is located. Numerical models of this procedure can aid in the interpretation of experimental results. However, the thermophysical properties of the test object as well as the amount of energy absorbed during this process are not readily available for such models. This paper presents an extension of the thermographic signal reconstruction (TSR) procedure in which the temperature and the time scales are respectively normalized with equilibrium temperature and the break time. In the normalized form these profiles are independent of material properties and instrumentation settings. Thus in the normalized format, experimental results can be readily compared with numerically generated thermographic results. The defect depth can also be easily obtained as a fraction of plate thickness from this plot. •A new normalization procedure for interpreting results of pulse TNDE is proposed.•TNDE results become simpler and material independent after normalization.•Scaling issues in correlating experimental and numerical results are eliminated.•Normalized results provide direct estimation of defect depth.
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content type line 23
ISSN:0963-8695
1879-1174
DOI:10.1016/j.ndteint.2016.03.005