Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography
This work investigates the application of lock-in thermography approach for solar loading thermography applications. In conventional lock-in thermography, a specimen is subjected to a periodically changing heat flux. This heat flux usually enters the specimen in one of three ways: by a point source,...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/7/3097 |
| _version_ | 1827696374410379264 |
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| author | Samuel Klein Henrique Fernandes Hans-Georg Herrmann |
| author_facet | Samuel Klein Henrique Fernandes Hans-Georg Herrmann |
| author_sort | Samuel Klein |
| collection | DOAJ |
| description | This work investigates the application of lock-in thermography approach for solar loading thermography applications. In conventional lock-in thermography, a specimen is subjected to a periodically changing heat flux. This heat flux usually enters the specimen in one of three ways: by a point source, a line source or an extended source (area source). Calculations based on area sources are particularly well suited to adapt to solar loading thermography, because most natural heat sources and heat sinks can be approximated to be homogenously extended over a certain region of interest. This is of particular interest because natural heat phenomena cover a large area, which makes this method suitable for measuring large-scale samples. This work investigates how the extended source approximation formulas for determining thermally thick and thermally thin material properties can be used in a naturally excited setup, shows possible error sources, and gives quantitative results for estimating thermal effusivity of a retaining wall structure. It shows that this method can be used on large-scale structures that are subject to natural outside heating phenomena. |
| first_indexed | 2024-03-10T12:45:47Z |
| format | Article |
| id | doaj.art-aff6591176e249928a2fc80bccd022ce |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T12:45:47Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-aff6591176e249928a2fc80bccd022ce2023-11-21T13:32:47ZengMDPI AGApplied Sciences2076-34172021-03-01117309710.3390/app11073097Estimating Thermal Material Properties Using Solar Loading Lock-in ThermographySamuel Klein0Henrique Fernandes1Hans-Georg Herrmann2Chair for Lightweight Systems, Saarland University, Campus E3 1, 66123 Saarbrücken, GermanyFaculty of Computing, Federal University of Uberlandia, Uberlandia 38408-100, BrazilChair for Lightweight Systems, Saarland University, Campus E3 1, 66123 Saarbrücken, GermanyThis work investigates the application of lock-in thermography approach for solar loading thermography applications. In conventional lock-in thermography, a specimen is subjected to a periodically changing heat flux. This heat flux usually enters the specimen in one of three ways: by a point source, a line source or an extended source (area source). Calculations based on area sources are particularly well suited to adapt to solar loading thermography, because most natural heat sources and heat sinks can be approximated to be homogenously extended over a certain region of interest. This is of particular interest because natural heat phenomena cover a large area, which makes this method suitable for measuring large-scale samples. This work investigates how the extended source approximation formulas for determining thermally thick and thermally thin material properties can be used in a naturally excited setup, shows possible error sources, and gives quantitative results for estimating thermal effusivity of a retaining wall structure. It shows that this method can be used on large-scale structures that are subject to natural outside heating phenomena.https://www.mdpi.com/2076-3417/11/7/3097infrared thermographysolar loading thermographylock-in thermographypassive thermographythermal thicknessthermal effusivity |
| spellingShingle | Samuel Klein Henrique Fernandes Hans-Georg Herrmann Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography Applied Sciences infrared thermography solar loading thermography lock-in thermography passive thermography thermal thickness thermal effusivity |
| title | Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography |
| title_full | Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography |
| title_fullStr | Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography |
| title_full_unstemmed | Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography |
| title_short | Estimating Thermal Material Properties Using Solar Loading Lock-in Thermography |
| title_sort | estimating thermal material properties using solar loading lock in thermography |
| topic | infrared thermography solar loading thermography lock-in thermography passive thermography thermal thickness thermal effusivity |
| url | https://www.mdpi.com/2076-3417/11/7/3097 |
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