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Proceedings Paper

Compact optical sensors for measuring linear and angular velocities
Author(s): Bjarke Rose; Per E. Ibsen; Steen Gruner Hanson; Rene Skov Hansen
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Paper Abstract

In this paper, we present a suite of novel speckle based displacement sensors. A laser beam illuminates the optically rough object and the light scattered off the object is collected and processed by various optical elements and, finally, the speckle pattern is detected. A new theoretical tool has been developed in which the speckle dynamics at the detector plane is described for an arbitrary complex optical system simply by means of the ABCD ray-transfer matrix elements for the optical system. Armed with the general theoretical tool, this paper discusses the correlation between object displacement and the speckle dynamics observed at the detector. In particular, the general theoretical tool allows trade-of analyses that are very important for industrial applications. As an example, all the sensors presented here are designed such that they are independent on variations in object distance. A new method is introduced in which rapid prototype optical sensors can be realized with standard optical elements. This facilitates a way of rapid realization of very compact optical sensors.

Paper Details

Date Published: 21 September 1999
PDF: 10 pages
Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999); doi: 10.1117/12.364268
Show Author Affiliations
Bjarke Rose, Ibsen Micro Structures A/S (Denmark)
Per E. Ibsen, Ibsen Micro Structures A/S (Denmark)
Steen Gruner Hanson, Risoe National Lab. (Denmark)
Rene Skov Hansen, Risoe National Lab. (Denmark)

Published in SPIE Proceedings Vol. 3824:
Optical Measurement Systems for Industrial Inspection
Malgorzata Kujawinska; Wolfgang Osten, Editor(s)

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