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Proceedings Paper

Three-dimensional digital holographic aperture synthesis for rapid and highly-accurate large-volume metrology
Author(s): Stephen Crouch; Brant M. Kaylor; Zeb W. Barber; Randy R. Reibel
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Paper Abstract

Currently large volume, high accuracy three-dimensional (3D) metrology is dominated by laser trackers, which typically utilize a laser scanner and cooperative reflector to estimate points on a given surface. The dependency upon the placement of cooperative targets dramatically inhibits the speed at which metrology can be conducted. To increase speed, laser scanners or structured illumination systems can be used directly on the surface of interest. Both approaches are restricted in their axial and lateral resolution at longer stand-off distances due to the diffraction limit of the optics used. Holographic aperture ladar (HAL) and synthetic aperture ladar (SAL) can enhance the lateral resolution of an imaging system by synthesizing much larger apertures by digitally combining measurements from multiple smaller apertures. Both of these approaches only produce two-dimensional imagery and are therefore not suitable for large volume 3D metrology. We combined the SAL and HAL approaches to create a swept frequency digital holographic 3D imaging system that provides rapid measurement speed for surface coverage with unprecedented axial and lateral resolution at longer standoff ranges. The technique yields a “data cube” of Fourier domain data, which can be processed with a 3D Fourier transform to reveal a 3D estimate of the surface. In this paper, we provide the theoretical background for the technique and show experimental results based on an ultra-wideband frequency modulated continuous wave (FMCW) chirped heterodyne ranging system showing ~100 micron lateral and axial precisions at >2 m standoff distances.

Paper Details

Date Published: 1 September 2015
PDF: 7 pages
Proc. SPIE 9576, Applied Advanced Optical Metrology Solutions, 95760H (1 September 2015); doi: 10.1117/12.2190373
Show Author Affiliations
Stephen Crouch, Bridger Photonics, Inc. (United States)
Brant M. Kaylor, Bridger Photonics, Inc. (United States)
Zeb W. Barber, Montana State Univ. (United States)
Randy R. Reibel, Bridger Photonics, Inc. (United States)


Published in SPIE Proceedings Vol. 9576:
Applied Advanced Optical Metrology Solutions
Erik Novak; James D. Trolinger, Editor(s)

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