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Proceedings Paper

Laser-based measurement scheme for rotational measurement of specularly reflective shafts
Author(s): Steen Gruner Hanson; Bengt Hurup Hansen
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Paper Abstract

A novel method for measurement of rotational speed for reflective (machined or polished) shafts is presented. The method is based on Fourier transforming the scattered field from a single laser beam that illuminates the target. The detected intensity at two spatially separated positions in the Fourier plane will provide two signals, which, to a high degree, are identical except for a time delay. Tracking of the time delay for maximum covariance thus facilitates temporal probing of the instantaneous rotational speed and torsional vibrations. The method is insensitive to the shape and radius of the rotating shaft and to any additional translational motion. Further, the signal level is usually superior to the level in the existing method because direct reflection is detected. Mounting of retroreflective tape is, therefore, not required. A theoretical description is given with measurements based on using a delay-locked loop

Paper Details

Date Published: 1 November 1994
PDF: 11 pages
Proc. SPIE 2292, Fiber Optic and Laser Sensors XII, (1 November 1994); doi: 10.1117/12.191861
Show Author Affiliations
Steen Gruner Hanson, Riso National Lab. (Denmark)
Bengt Hurup Hansen, Riso National Lab. (Denmark)


Published in SPIE Proceedings Vol. 2292:
Fiber Optic and Laser Sensors XII
Ramon P. DePaula, Editor(s)

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