Schweikert, Kai ; Sielaff, Axel ; Stephan, Peter (2021):
Pixel-wise in situ calibration method for high accuracy infrared thermography of moving targets.
In: Infrared Physics & Technology, Elsevier, ISSN 1350-4495,
DOI: 10.1016/j.infrared.2021.103862,
[Article]
Abstract
We present a calibration method for the measurement of temperature using infrared cameras that enables high-accuracy thermography of moving targets with locally varying emissivity. Correlation-based image matching techniques are applied to calculate position-dependent calibration functions with sub-pixel accuracy. The calibration method is described in detail and demonstrated using an experimental setup consisting of a rotating cube. The measurement uncertainty is analysed in comparison to a conventional pixel-wise in situ method used for non-moving measurements. An analysis is carried out for varying levels of sub-pixel resolution and within different regions of the field of view. The results show that the measurement uncertainty decreases with increasing sub-pixel resolution and is comparable to levels obtained with a pixel-wise in situ calibration applied on a non-moving target. The error introduced by the motion of the sample was reduced by 75 on a high emissivity surface and by 96 within an area of the field of view, which experienced significant emissivity changes due to the motion of the sample.
| Item Type: | Article |
|---|---|
| Erschienen: | 2021 |
| Creators: | Schweikert, Kai ; Sielaff, Axel ; Stephan, Peter |
| Title: | Pixel-wise in situ calibration method for high accuracy infrared thermography of moving targets |
| Language: | English |
| Abstract: | We present a calibration method for the measurement of temperature using infrared cameras that enables high-accuracy thermography of moving targets with locally varying emissivity. Correlation-based image matching techniques are applied to calculate position-dependent calibration functions with sub-pixel accuracy. The calibration method is described in detail and demonstrated using an experimental setup consisting of a rotating cube. The measurement uncertainty is analysed in comparison to a conventional pixel-wise in situ method used for non-moving measurements. An analysis is carried out for varying levels of sub-pixel resolution and within different regions of the field of view. The results show that the measurement uncertainty decreases with increasing sub-pixel resolution and is comparable to levels obtained with a pixel-wise in situ calibration applied on a non-moving target. The error introduced by the motion of the sample was reduced by 75 on a high emissivity surface and by 96 within an area of the field of view, which experienced significant emissivity changes due to the motion of the sample. |
| Journal or Publication Title: | Infrared Physics & Technology |
| Publisher: | Elsevier |
| Uncontrolled Keywords: | infrared thermography, thermal imaging, calibration, in situ, moving object |
| Divisions: | 16 Department of Mechanical Engineering 16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD) |
| Date Deposited: | 20 Aug 2021 09:47 |
| DOI: | 10.1016/j.infrared.2021.103862 |
| URL / URN: | https://www.sciencedirect.com/science/article/pii/S135044952... |
| Additional Information: | Art.No.: 103862 |
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