22 January 1987 Hybrid, High Accuracy Structured Light Profiler
Author Affiliations +
Proceedings Volume 0728, Optics, Illumination, and Image Sensing for Machine Vision; (1987) https://doi.org/10.1117/12.937833
Event: Cambridge Symposium_Intelligent Robotics Systems, 1986, Cambridge, MA, United States
There exists an increasing need in industry, particularly for machined parts, for higher accuracy profile measurements. Structured lighting techniques have proven valuable for such profile measurements, but have typically been limited in their accuracy by focus and sensor limitations. This paper describes a different approach to a structured light type of system which instead takes full advantage of the high accuracies and range available with precision measurement positioning stages. The resulting system, the optical guillotine, provides an optical equivalent of the commonly used mechanical guillotine and feeler gages used for making measurements, except with much greater speed and measurement capability. The optical guillotine effect is created by translating a collimated sheet of light relative to the object's surface along the line of sight of the viewing system such that the line will cut across a constant cross-section of the object at the points on the object which are at the depth as indicated by the stage. This system takes advantage of a compensated focus of both the illumination beam and the viewing system so that the system is not limited by the depth-of-focus of the viewing lens. For high slopes surfaces, very little data processing is required and the signal to noise ratio is inherently very high. These properties make the system capable of very fast measurements, covering a depth of over 15 centimeters in one second with a measurement accuracy of a few microns. The theoretical and design considerations of this approach, including the sources of errors for this type of system in general, are discussed in this paper. The results of a breadboard system, based on this design analysis, is also presented.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kevin G. Harding, Kevin G. Harding, Kenneth Goodson, Kenneth Goodson, } "Hybrid, High Accuracy Structured Light Profiler", Proc. SPIE 0728, Optics, Illumination, and Image Sensing for Machine Vision, (22 January 1987); doi: 10.1117/12.937833; https://doi.org/10.1117/12.937833


A new sensor alignment method for an 8k x 4k...
Proceedings of SPIE (June 06 2004)
Single-camera fixed perspective 360-deg 3D method
Proceedings of SPIE (January 19 1997)
Survey Of Design Considerations For 3-D Imaging Systems
Proceedings of SPIE (March 06 1989)
Analysis of methods for image rearrangement
Proceedings of SPIE (March 14 1994)
Position Decoupled Optical Inspection Relay System
Proceedings of SPIE (March 31 1990)
Tolerance Design Of A High Precision Optical Gage
Proceedings of SPIE (November 13 1988)

Back to Top