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Optical Engineering

Four-map absolute distance contouring
Author(s): Xinjun Xie; Michael J. Lalor; David R. Burton; Michael Mason Shaw
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Paper Abstract

A new method called four-map absolute distance contouring, based on the shadow moire´ technique, is described. In this system, the period of a sinusoidal grating is varied through its rotation, with the effect that the phase of the moire´ pattern is also changed. By selecting suitable rotation angles, four images at different grating positions are acquired, from which the absolute distance from the object to the grating can be determined. The theoretical analysis is presented for the method, which has been verified by suitable laboratory experimentation. The measurable range is directly proportional to the period of the grating and inversely proportional to the angles through which the grating is rotated. The results show that the method is fast and accurate.

Paper Details

Date Published: 1 September 1997
PDF: 4 pages
Opt. Eng. 36(9) doi: 10.1117/1.601480
Published in: Optical Engineering Volume 36, Issue 9
Show Author Affiliations
Xinjun Xie, Liverpool John Moores Univ. (United Kingdom)
Michael J. Lalor, Liverpool John Moores Univ. (United Kingdom)
David R. Burton, Liverpool John Moores Univ. (United Kingdom)
Michael Mason Shaw, Liverpool John Moores Univ. (United Kingdom)

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