Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1992-08-11
1993-12-14
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
356376, 356 1, G01B 1124
Patent
active
052707954
ABSTRACT:
To provide a system for the optical ranging of a selected point on a target surface irradiated with light while avoiding false signals from other sources in a cluttered environment, the system employs a combination of the triangulation ranging technique with the Biris ranging technique, i.e. imaging onto a position sensitive photodetector through an apertured mask. This combination enables the respective equations for range that apply to the respective techniques to be combined to generate an equation that is true only for target surface points that are directly on the light beam, hence enabling rejection of false signals on the basis of those that fail to satisfy this latter equation. The system has the advantage of flexibility, in that it permits the light beam to be directed onto the target surface from a wide range of locations relative to the detector. In addition, three dimensional data on the target surface can be obtained by using at least one further light beam inclined to the first beam and a mask with more than two apertures. For many practical applications this latter arrangement avoids a need to scan the target surface relative to the detector.
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patent: 5018854 (1991-05-01), Rioux
patent: 5168327 (1992-12-01), Yamawaki
F. Blais et al., "Practical Considerations for a Design of a High Precision 3-D Laser Scanner System", Optomechanical and Electro-optical Design of Industrial Systems, SPIE vol. 959, 1988, pp. 225-246.
F. Blais et al., "Optical Range Image Acquisition for the Navigation of a Mobile Robot", Proceedings of the 1991 IEEE International Conference on Robotics and Automation, Sacramento, Calif., Apr. 9-11, 1991.
M. Rioux et al., "Compact Three-Dimensional Camera for Robotic Applications", Journal of the Optical Society of America A., vol. 3, p. 1518, Sep. 1986.
Evans F. L.
National Research Council of Canada/Conseil National de Recherec
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