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Proceedings Paper

Selectivity of spatial filtering velocimetry of objective speckles for measuring out-of-plane motion
Author(s): M. L. Jakobsen; H. T. Yura; S. G. Hanson
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Paper Abstract

We probe the dynamics of objective laser speckles as the axial distance between the object and the observation plane changes. With the purpose of measuring out-of-plane motion in real time, we apply optical spatial filtering velocimetry to the speckle dynamics. To achieve this, a rotationally symmetric spatial filter is designed. The spatial filter converts the speckle dynamics into a photocurrent with a quasi-sinusoidal response to the out-of-plane motion. Our contribution presents the technology and discusses the selectivity of the spatial filter. Specifically, we discuss how the selectivity of the spatial filter with regard to radial speckle motion is influenced by a concurrent in-plane speckle motion. The spatial filter is emulated with a CCD camera, and is tested on speckle acquisitions obtained from a controlled set-up. Experiments with the emulated filters illustrate performance and potential applications of the technology.

Paper Details

Date Published: 9 May 2012
PDF: 11 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 843910 (9 May 2012); doi: 10.1117/12.922911
Show Author Affiliations
M. L. Jakobsen, Technical Univ. of Denmark (Denmark)
H. T. Yura, The Aerospace Corp. (United States)
S. G. Hanson, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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