Compact system for measuring rotational speed in two dimensions

Steen Gruner Hanson; Rene Skov Hansen; Bengt Hurup Hansen

doi:10.1117/12.364245

21 September 1999 Compact system for measuring rotational speed in two dimensions

Steen Gruner Hanson, Rene Skov Hansen, Bengt Hurup Hansen

Proceedings Volume 3824, Optical Measurement Systems for Industrial Inspection; (1999) https://doi.org/10.1117/12.364245
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

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.

Citation Download Citation

Steen Gruner Hanson, Rene Skov Hansen, and Bengt Hurup Hansen "Compact system for measuring rotational speed in two dimensions", Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999); https://doi.org/10.1117/12.364245

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