Kapitel/Beitrag aus dem Buch: Beyerer J. & Längle T. 2021. OCM 2021 – 5th International Conference on Optical Characterization of Materials, March 17th – 18th, 2021, Karlsruhe, Germany : Conference Proceedings.
Structured light sensors for three-dimensional (3D)
shape measurements working in the visible up to the shortwave
infrared range have been intensively investigated in the last
decades. Reliable measurements require diffuse reflection of the
projected patterns. However, this condition is strongly limited
or not fulfilled for transparent, translucent, shiny, or absorbing
materials. Based on the scanning from heating approach, we
have developed a two-step optical method for the measurement
of such uncooperative objects. In this contribution, we present
a simplified and robust projection technique of a focused single
thermal fringe. Due to the irradiation of only locally strongly
restricted areas, we obtain considerably higher intensities which
enables us to reduce the total measurment time to or even below
the second range while increasing the measurement accuracy.
We show measurement results of non-opaque surfaces of objects
made of a single material as well as of metal objects. Our customizable
setup is of interest for quality assurance, bin picking,
digitization, and many other areas of applications.
Landmann, M et al. 2021. Improvement of Thermal Fringe Projection forFast and Accurate 3D Shape Measurement ofTransparent Objects. In: Beyerer J. & Längle T (eds.), OCM 2021 – 5th International Conference on Optical Characterization of Materials, March 17th – 18th, 2021, Karlsruhe, Germany : Conference Proceedings. Karlsruhe: KIT Scientific Publishing. DOI: https://doi.org/10.58895/ksp/1000128686-9
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Veröffentlicht am 17. März 2021