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Optical Engineering

Three-dimensional displacement measurement using chirp modulation in a photorefractive correlator
Author(s): Renu Tripathi; G. S. Pati; Arvind Kumar; Kehar Singh
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Paper Abstract

A speckle correlation technique based on chirp modulation of the speckle interference pattern is proposed and demonstrated for the measurement of 3-D rigid body motion. The chirp modulation is a consequence of the out-of-plane displacement component associated with object motion. The Fresnel zone plate action introduced by chirp modulation causes the correlation peaks to focus at different planes along the longitudinal direction. The separation between the correlation peaks along the transverse direction gives a measure of in-plane displacement of object motion. Both simulation and experimental studies are performed to establish the proposed technique.

Paper Details

Date Published: 1 November 1998
PDF: 9 pages
Opt. Eng. 37(11) doi: 10.1117/1.601886
Published in: Optical Engineering Volume 37, Issue 11
Show Author Affiliations
Renu Tripathi, Indian Institute of Technology (India)
G. S. Pati, Indian Institute of Technology (India)
Arvind Kumar, Indian Institute of Technology/Kharagpur (United States)
Kehar Singh, Indian Institute of Technology (India)

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