Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials
Spatial and temporal knowledge of temperature evolution is crucial in laser beam welding of low-melting materials such as aluminum alloys. Current temperature measurements are restricted to (i) one-dimensional temperature information (e.g., ratio-pyrometers), (ii) a priori knowledge of emissivity (e...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/10/4908 |
| _version_ | 1827740091027554304 |
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| author | Karen Schwarzkopf Richard Rothfelder Michael Rasch Michael Schmidt |
| author_facet | Karen Schwarzkopf Richard Rothfelder Michael Rasch Michael Schmidt |
| author_sort | Karen Schwarzkopf |
| collection | DOAJ |
| description | Spatial and temporal knowledge of temperature evolution is crucial in laser beam welding of low-melting materials such as aluminum alloys. Current temperature measurements are restricted to (i) one-dimensional temperature information (e.g., ratio-pyrometers), (ii) a priori knowledge of emissivity (e.g., thermography), and (iii) high-temperature regions (e.g., two-color-thermography). This study presents a ratio-based two-color-thermography system that enables acquiring spatially and temporally resolved temperature information for low-melting temperature ranges (<1200 K). The study demonstrates that temperature can be accurately determined despite variations in signal intensity and emissivity for objects emitting constant thermal radiation. The two-color-thermography system is further transferred into a commercial laser beam welding set-up. Experiments with varying process parameters are conducted, and the ability of the thermal imaging method to measure dynamic temperature behavior is assessed. Image artifacts presumably caused by internal reflections inside the optical beam path limit the direct application of the developed two-color-thermography system during dynamic temperature evolution. |
| first_indexed | 2024-03-11T03:20:09Z |
| format | Article |
| id | doaj.art-27cc3de76e52499188eee305d57f30d8 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T03:20:09Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-27cc3de76e52499188eee305d57f30d82023-11-18T03:14:23ZengMDPI AGSensors1424-82202023-05-012310490810.3390/s23104908Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting MaterialsKaren Schwarzkopf0Richard Rothfelder1Michael Rasch2Michael Schmidt3Institute of Photonic Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Konrad-Zuse-Str. 3/5, 91052 Erlangen, GermanyInstitute of Photonic Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Konrad-Zuse-Str. 3/5, 91052 Erlangen, GermanyInstitute of Photonic Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Konrad-Zuse-Str. 3/5, 91052 Erlangen, GermanyInstitute of Photonic Technologies, Friedrich-Alexander-Universität Erlangen-Nürnberg, Konrad-Zuse-Str. 3/5, 91052 Erlangen, GermanySpatial and temporal knowledge of temperature evolution is crucial in laser beam welding of low-melting materials such as aluminum alloys. Current temperature measurements are restricted to (i) one-dimensional temperature information (e.g., ratio-pyrometers), (ii) a priori knowledge of emissivity (e.g., thermography), and (iii) high-temperature regions (e.g., two-color-thermography). This study presents a ratio-based two-color-thermography system that enables acquiring spatially and temporally resolved temperature information for low-melting temperature ranges (<1200 K). The study demonstrates that temperature can be accurately determined despite variations in signal intensity and emissivity for objects emitting constant thermal radiation. The two-color-thermography system is further transferred into a commercial laser beam welding set-up. Experiments with varying process parameters are conducted, and the ability of the thermal imaging method to measure dynamic temperature behavior is assessed. Image artifacts presumably caused by internal reflections inside the optical beam path limit the direct application of the developed two-color-thermography system during dynamic temperature evolution.https://www.mdpi.com/1424-8220/23/10/4908two-color-thermographytemperaturetemperature determinationratio-based temperature measurementlaser beam weldinglow-melting materials |
| spellingShingle | Karen Schwarzkopf Richard Rothfelder Michael Rasch Michael Schmidt Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials Sensors two-color-thermography temperature temperature determination ratio-based temperature measurement laser beam welding low-melting materials |
| title | Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials |
| title_full | Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials |
| title_fullStr | Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials |
| title_full_unstemmed | Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials |
| title_short | Two-Color-Thermography for Temperature Determination in Laser Beam Welding of Low-Melting Materials |
| title_sort | two color thermography for temperature determination in laser beam welding of low melting materials |
| topic | two-color-thermography temperature temperature determination ratio-based temperature measurement laser beam welding low-melting materials |
| url | https://www.mdpi.com/1424-8220/23/10/4908 |
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