Compact optical sensors for measuring linear and angular velocities

Bjarke Rose; Per E. Ibsen; Steen Gruner Hanson; Rene Skov Hansen

doi:10.1117/12.364268

21 September 1999 Compact optical sensors for measuring linear and angular velocities

Bjarke Rose, Per E. Ibsen, Steen Gruner Hanson, Rene Skov Hansen

Proceedings Volume 3824, Optical Measurement Systems for Industrial Inspection; (1999) https://doi.org/10.1117/12.364268
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

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.

Citation Download Citation

Bjarke Rose, Per E. Ibsen, Steen Gruner Hanson, and Rene Skov Hansen "Compact optical sensors for measuring linear and angular velocities", Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999); https://doi.org/10.1117/12.364268

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