Induction Thermography for Surface Crack Detection and Depth Determination
In the last few years, induction thermography has been established as a non-destructive testing method for localizing surface cracks in metals. The sample to be inspected is heated with a short induced electrical current pulse, and the infrared camera records—during and after the heating pulse—the t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-02-01
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| Series: | Applied Sciences |
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| Online Access: | http://www.mdpi.com/2076-3417/8/2/257 |
| _version_ | 1819262327735713792 |
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| author | Beate Oswald-Tranta |
| author_facet | Beate Oswald-Tranta |
| author_sort | Beate Oswald-Tranta |
| collection | DOAJ |
| description | In the last few years, induction thermography has been established as a non-destructive testing method for localizing surface cracks in metals. The sample to be inspected is heated with a short induced electrical current pulse, and the infrared camera records—during and after the heating pulse—the temperature distribution at the surface. Transforming the temporal temperature development for each pixel to phase information makes not only highly reliable detection of the cracks possible but also allows an estimation of its depth. Finite element simulations were carried out to investigate how the phase contrast depends on parameters such as excitation frequency, pulse duration, material parameters, crack depth, and inclination angle of the crack. From these results, generalized functions for the dependency of the phase difference on all these parameters were derived. These functions can be used as an excellent guideline as to how measurement parameters should be optimized for a given material to be able to detect cracks and estimate their depth. Several experiments on different samples were also carried out, and the results compared with the simulations showed very good agreement. |
| first_indexed | 2024-12-23T19:55:56Z |
| format | Article |
| id | doaj.art-16806b36cf0b40828fc5bbb8651acce4 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-23T19:55:56Z |
| publishDate | 2018-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-16806b36cf0b40828fc5bbb8651acce42022-12-21T17:33:14ZengMDPI AGApplied Sciences2076-34172018-02-018225710.3390/app8020257app8020257Induction Thermography for Surface Crack Detection and Depth DeterminationBeate Oswald-Tranta0Institute for Automation, University of Leoben, Leoben A-8700, AustriaIn the last few years, induction thermography has been established as a non-destructive testing method for localizing surface cracks in metals. The sample to be inspected is heated with a short induced electrical current pulse, and the infrared camera records—during and after the heating pulse—the temperature distribution at the surface. Transforming the temporal temperature development for each pixel to phase information makes not only highly reliable detection of the cracks possible but also allows an estimation of its depth. Finite element simulations were carried out to investigate how the phase contrast depends on parameters such as excitation frequency, pulse duration, material parameters, crack depth, and inclination angle of the crack. From these results, generalized functions for the dependency of the phase difference on all these parameters were derived. These functions can be used as an excellent guideline as to how measurement parameters should be optimized for a given material to be able to detect cracks and estimate their depth. Several experiments on different samples were also carried out, and the results compared with the simulations showed very good agreement.http://www.mdpi.com/2076-3417/8/2/257thermographyinduction heatingcrack detectioncrack depth |
| spellingShingle | Beate Oswald-Tranta Induction Thermography for Surface Crack Detection and Depth Determination Applied Sciences thermography induction heating crack detection crack depth |
| title | Induction Thermography for Surface Crack Detection and Depth Determination |
| title_full | Induction Thermography for Surface Crack Detection and Depth Determination |
| title_fullStr | Induction Thermography for Surface Crack Detection and Depth Determination |
| title_full_unstemmed | Induction Thermography for Surface Crack Detection and Depth Determination |
| title_short | Induction Thermography for Surface Crack Detection and Depth Determination |
| title_sort | induction thermography for surface crack detection and depth determination |
| topic | thermography induction heating crack detection crack depth |
| url | http://www.mdpi.com/2076-3417/8/2/257 |
| work_keys_str_mv | AT beateoswaldtranta inductionthermographyforsurfacecrackdetectionanddepthdetermination |