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- Sjödahl, Mikael, 1965-, et al.
(author)
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In-line quality control utilizing close-range photogrammetry and a CAD-model
- 2021
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In: Engineering Research Express. - : Institute of Physics (IOP). - 2631-8695. ; 3:3
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Journal article (peer-reviewed)abstract
- This paper presents an overview of a measurement system that is designed for in-line shape inspection of metal sheet components in real-time utilizing pre-calibrated close-range photogrammetry and a CAD-model. The system is currently designed to measure parts thrown out on a conveyor belt that moves at about 1 m s−1 at a frequency of 0.5 Hz or less without fixturing. Detected features on the components in the camera images are used to align the CAD-model, describing the nominal shape, to the images from which required deviations are computed using photogrammetry. The measurement volume of the current system is 500 × 800 × 200 mm3 and absolute measurements are performed with an accuracy in the order of 0.1 mm. The in-line functionalities of the system have been verified at several real production sites in Sweden. In this paper, the basic components of the system are described together with a few results from real tests.
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