A Complementary Sensor Approach to Reverse Engineering

[+] Author and Article Information
C. Bradley, V. Chan

Dept. of Mechanical Engineering, University of Victoria, Canada

J. Manuf. Sci. Eng 123(1), 74-82 (Feb 01, 2000) (9 pages) doi:10.1115/1.1349556 History: Received July 01, 1999; Revised February 01, 2000
Copyright © 2001 by ASME
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Examples of part topologies more suited to digitization by touch probe
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Photographs of the two sensors employed in the complementary system (a) A 3D laser digitizer collecting data from an object’s surface (b) A touch probe digitizing the physical edges present on an object
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The laser line being traversed over the object’s surface—digitization extends beyond the discrete patch boundaries
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Cloud data from an object composed of several quadric surface patches—the data is unformatted preventing the application of image processing operators
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Comparison between laser range sensor and touch probe for defining physical edges (a) imprecise edge definition achieved with the laser range sensor (b) precise location of the patch boundary using the touch probe
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Inter-connection of the major components in the dual sensor system
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Flowchart illustrating the digitization and data modeling process
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Calibration of the sensors to the CMM coordinate system (a) referencing of the laser to the coordinate system datum point (b) calibration of the laser sensor viewing angle (c) referencing of the touch probe to the coordinate system datum point
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Creation of a surface patch from four bounding B-spline curves
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Photograph of the test object showing the surface patches and boundaries
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The data sets collected from the test object (a) the laser sensor cloud data captured from four viewing angles (b) the boundaries fitted with B-spline curve networks
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The final B-spline surface patch fitted to the cloud data from the object’s side




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