Reconstruction of Microscopic Thermal Fields from Oversampled Infrared Images in Laser-Based Powder Bed Fusion
| Autor: | Thomas B. O. Rockett, Jon R. Willmott, Magnus Anderson, Iain Todd, Leigh Russell Stanger, Matthew Davies, Alistair Lyle, Hector Basoalto |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Work (thermodynamics) Materials science Infrared Measure (physics) 02 engineering and technology TP1-1185 Biochemistry Signal Transfer function Article Analytical Chemistry law.invention 020901 industrial engineering & automation Optics law Thermal thermal imaging Electrical and Electronic Engineering Instrumentation Fusion quantitative thermography powder bed fusion (PBF) in situ monitoring business.industry Chemical technology Lasers 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics Thermography Powders 0210 nano-technology business selective laser melting (SLM) additive manufacturing |
| Zdroj: | Sensors (Basel, Switzerland) Sensors, Vol 21, Iss 4859, p 4859 (2021) Sensors Volume 21 Issue 14 |
| ISSN: | 1424-8220 |
| Popis: | This article elucidates the need to consider the inherent spatial transfer function (blur), of any thermographic instrument used to measure thermal fields. Infrared thermographic data were acquired from a modified, commercial, laser-based powder bed fusion printer. A validated methodology was used to correct for spatial transfer function errors in the measured thermal fields. The methodology was found to make a difference of 40% to the measured signal levels and a 174 °C difference to the calculated effective temperature. The spatial gradients in the processed thermal fields were found to increase significantly. These corrections make a significant difference to the accuracy of validation data for process and microstructure modeling. We demonstrate the need for consideration of image blur when quantifying the thermal fields in laser-based powder bed fusion in this work. |
| Databáze: | OpenAIRE |
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