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Multimodal sensor: High-speed 3D and thermal measurement

: Landmann, M.; Heist, S.; Dietrich, P.; Lutzke, P.; Gebhart, I.; Kühmstedt, P.; Notni, G.

Fulltext ()

Rosenberger, M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Photonics and Education in Measurement Science 2019 : 17-19 September 2019, Jena, Germany
Bellingham, WA: SPIE, 2019 (Proceedings of SPIE 11144)
ISBN: 978-1-5106-2981-3
ISBN: 978-1-5106-2982-0
Paper 1114403, 7 pp.
Conference "Photonics and Education in Measurement Science" <2019, Jena>
Conference Paper, Electronic Publication
Fraunhofer IOF ()

For the measurement of three-dimensional (3D) shapes, active optical measurement systems based on pattern projection are widely used. These sensors work without contact and are non-destructive. Between one camera and the projector or between two cameras, the 3D reconstruction is performed by detection and triangulation of corresponding image points. Recently, we developed a 3D stereo sensor working in the visible range of light (VIS). It consists of two highspeed cameras and a GOBO projection-based high-speed pattern projector. Our system allows us to successfully reconstruct 3D point clouds of fast processes such as athletes in motion or even crash tests. Simultaneously measuring the surface temperature would be of great benefit as fast processes usually exhibit local temperature changes. In order to include thermal data into the evaluation, we have extended our existing high-speed 3D sensor by including an additional high-speed long-wave infrared (LWIR) camera. The thermal camera detects radiation in the spectral range between 7.5 and 12 μm. We map the measured temperatures as texture onto the reconstructed 3D points. In this contribution, we present the design of this novel 5D (three spatial coordinates, temperature, and time) sensor. The simultaneous calibration process of the VIS cameras and the LWIR camera in a common coordinate system is described. First promising measurements of an inflating airbag, a basketball player, and the crushing of a metal tube performed at a frame rate of 1 kHz are shown.