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Proceedings Paper

Multi-axis heterodyne interferometric for simultaneous observation of 5 degrees of freedom using a single beam
Author(s): James Perea; Brad Libbey; George Nehmetallah
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Paper Abstract

A multi-axis heterodyne interferometer concept is under development for observations of five degrees of dynamic freedom using a single illumination source. This paper presents a laboratory system that combines elements of heterodyne Doppler vibrometry, holography, and digital image correlation to simultaneously quantify in-plane translation, out-of-plane rotation, and out-of-plane displacement at the nanometer scale. The sensor concept observes a dynamic object by mixing a single optical field with heterodyne reference beams and collecting these combined fields at the image and Fourier planes, simultaneously. Polarization and frequency multiplexing are applied to separate two segments of a receive Mach-Zehnder interferometer. Different optical configurations are utilized; one segment produces a focused image of the optical field scattered off the object while the other segment produces an optical Fourier transform of the optical field scattered off the object. Utilizing the amplitude and phase from each plane allows quantification of multiple components of transient motion using a single, orthogonal beam.

Paper Details

Date Published: 13 May 2019
PDF: 12 pages
Proc. SPIE 10991, Dimensional Optical Metrology and Inspection for Practical Applications VIII, 109910N (13 May 2019); doi: 10.1117/12.2519292
Show Author Affiliations
James Perea, U.S. Army RDECOM CERDEC NVESD (United States)
Catholic Univ. (United States)
Brad Libbey, U.S. Army RDECOM CERDEC NVESD (United States)
George Nehmetallah, The Catholic Univ. of America (United States)

Published in SPIE Proceedings Vol. 10991:
Dimensional Optical Metrology and Inspection for Practical Applications VIII
Kevin G. Harding; Song Zhang, Editor(s)

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