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Optical Engineering

Three-dimensional displacement measurement using diffractive optic interferometry
Author(s): John A. Gilbert; Robert L. Shepherd; Helen Johnson Cole; Paul R. Ashley
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Paper Abstract

A powerful new optical method that utilizes diffractive optic interferometry (DOI) to measure both in-plane and out-of-plane displacement with variable sensitivity using the same optical system is introduced. Sensitivity is varied utilizing various combinations of the different wavefronts produced by a conjugate pair of binary optical elements; a transmission grating is used to produce several illumination beams, while a reflective grating, replicated on the surface of a specimen, provides the reference for the undeformed state. A derivation of the equations that govern the method is included along with a discussion of the experimental tests conducted to verify the theory. Overall, the results are excellent, with experimental data agreeing to within a few percent of the theoretical predictions.

Paper Details

Date Published: 1 December 1997
PDF: 7 pages
Opt. Eng. 36(12) doi: 10.1117/1.601571
Published in: Optical Engineering Volume 36, Issue 12
Show Author Affiliations
John A. Gilbert, Univ. of Alabama in Huntsville (United States)
Robert L. Shepherd, Colorado School of Mines (United States)
Helen Johnson Cole, NASA Marshall Space Flight Ctr. (United States)
Paul R. Ashley, U.S. Army Missile Command (United States)

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