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Proceedings Paper

Compact system for measuring rotational speed in two dimensions
Author(s): Steen Gruner Hanson; Rene Skov Hansen; Bengt Hurup Hansen
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Paper Abstract

A simple system for detecting the rotation in two directions of a reflective ball is presented. The primary goal for the set-up is to realize a simple and compact concept that can be used for PC-cursor control, yet having an adequate precision for cursor control. A slightly diverging beam from a Vertical Surface Cavity Emitting Laser (VCSEL) mounted on a pcb-board with a diameter of 6.8 mm illuminates a reflective ball (0 4 mm) placed at a distance of 15 mm. Light scattered off the rotating ball produces a speckled field, which sweeps across two pairs of elongated photo detectors arranged perpendicular to each other. The four photo detector signals are digitized and fed into an ASIC, which determines the rotation of the ball in two directions including the sign of the rotation.

Paper Details

Date Published: 21 September 1999
PDF: 9 pages
Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999); doi: 10.1117/12.364245
Show Author Affiliations
Steen Gruner Hanson, Risoe National Lab. (Denmark)
Rene Skov Hansen, Risoe National Lab. (Denmark)
Bengt Hurup 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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