25 September 1997 Electro-optical correlation arrangement for fast 3D cameras: properties and facilities of the electro-optical mixer device
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Proceedings Volume 3100, Sensors, Sensor Systems, and Sensor Data Processing; (1997) https://doi.org/10.1117/12.287752
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany
Abstract
For advanced performances related to 3D metrology in production, security and traffic control, the Institut fur Nachrichtenverarbeitung is currently engaged in the investigation of a new 3D-camera system based on rf- modulation interferometry, other than triangulation. The new 3D-camera system proposed in this paper uses the techniques of optical rf-modulation of the active illumination source and the correlation of these signals reflected from a target within a large aperture. This method yields all phase- correlation functions, relating to each voxel of the 3D- scene in parallel. Hence, the system delivers a fast parallel measurement and evaluation process by completely using a 2D transmitting and receiving path. To fulfill this concept, we have set up a binocular system using a modified Pockels-cell arrangement and a modulated laser transmitter. Since the electro-optical modulator plays a key important role in realizing the whole system, we would discuss the modified arrangement of stacked birefringent KD*P crystals that incorporates the properties of large aperture and high frequency modulation in the region of some tenth of megahertz. Additionally, an optical reference path is introduced to compensate for the fluctuation of the light source, thus enhancing the capability of the system. The experimental results of this reformed system will be presented in this paper, e.g., the standard deviation of (lambda) /2500 being obtained.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Horst-Guenther Heinol, Horst-Guenther Heinol, Zhanping Xu, Zhanping Xu, Rudolf Schwarte, Rudolf Schwarte, Joachim Olk, Joachim Olk, Ruediger Klein, Ruediger Klein, } "Electro-optical correlation arrangement for fast 3D cameras: properties and facilities of the electro-optical mixer device", Proc. SPIE 3100, Sensors, Sensor Systems, and Sensor Data Processing, (25 September 1997); doi: 10.1117/12.287752; https://doi.org/10.1117/12.287752
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