The apparent effusivity method for normalized thermal contrast evaluation in infrared thermographic testing
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F23%3A43970754" target="_blank" >RIV/49777513:23640/23:43970754 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.infrared.2023.104931" target="_blank" >https://doi.org/10.1016/j.infrared.2023.104931</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.infrared.2023.104931" target="_blank" >10.1016/j.infrared.2023.104931</a>
Alternative languages
Result language
angličtina
Original language name
The apparent effusivity method for normalized thermal contrast evaluation in infrared thermographic testing
Original language description
Thermographic nondestructive testing is used for the detection of near-surface discontinuities in materials, where indications of potential defects or discontinuities are detected and evaluated by their thermal contrast. The key requirements for successful thermographic data processing include managing non-uniform heating and identifying nominal areas. Advanced methods often rely on numerical simulation, which can be challenging and time-consuming. This study suggests a new simple method of thermal contrast calculation for flash-pulse thermography. It is based on the analysis of the inverse apparent effusivity. It includes an automated indication of the sound (defect-free) area and the creation of an artificial reference sequence, which is based on a temperature profile of the sound area and the non-uniform heating map. Derivative analysis of the smoothed contrast data is applied to improve detectability and Contrast/Noise Ratio (CNR). An experimental comparison of the proposed method with other known methods is presented. In the presented example, it allowed detection of 23 defects with an average CNR of 6.13 dB, against the traditional differential absolute contrast method, which detected only 13 defects with an average CNR of 0.53 dB. Thus, high detectability and high CNR values provided by the proposed method are demonstrated.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/EF18_069%2F0010018" target="_blank" >EF18_069/0010018: LABIR-PAV / Pre-application research of infrared technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
INFRARED PHYSICS & TECHNOLOGY
ISSN
1350-4495
e-ISSN
1879-0275
Volume of the periodical
134
Issue of the periodical within the volume
NOV 2023
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
12
Pages from-to
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UT code for WoS article
001088651100001
EID of the result in the Scopus database
2-s2.0-85173432189