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Proceedings Paper

Differential measurements using two laser rotational vibrometers: dynamic backlash
Author(s): P. Martin; S. J. Rothberg
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Paper Abstract

The Laser Rotational Vibrometer is well suited to non-contact measurement of angular vibration on rotating targets, particularly by virtue of inherent insensitivity to target shape and translational motion. A differential measurement is proposed using two Vibrometers to allow a calculation of dynamic backlash between spur gears from relative tangential displacements. It is known that target motions, such as rotation, produce changes in the speckle pattern on the photodetector which add noise to the Vibrometer output. The significance of noise is always increased when differential measurements are required. The noise produced by the speckle pattern is apparent but the data reveals that it is possible to make the dynamic backlash measurement in this way. The dynamic backlash measurement is verified against equivalent high speed video footage, confirming the suitability of Laser Vibrometry in this application.

Paper Details

Date Published: 21 June 2006
PDF: 9 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63450N (21 June 2006); doi: 10.1117/12.693072
Show Author Affiliations
P. Martin, Loughborough Univ. (United Kingdom)
S. J. Rothberg, Loughborough Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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