Restoring high accuracy to laser Doppler vibrometry measurements affected by vibration of beam steering optics last version.pdf (740.76 kB)
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Restoring high accuracy to laser Doppler vibrometry measurements affected by vibration of beam steering optics

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journal contribution
posted on 29.06.2017, 12:34 authored by Ben Halkon, Steve RothbergSteve Rothberg
Laser Doppler vibrometers are now well-established as an effective non-contact alternative to traditional contacting transducers. Wide-ranging applications include those where beam steering optics are required to reach locations that are difficult to access but no attention has yet been given to measurement sensitivity to the vibration of those optics. In this paper, a thorough mathematical treatment of this sensitivity to steering optic vibration and its correction is set out. A very practical scheme requiring a single correction measurement, from the back-surface of the mirror at the incidence point and aligned with the mirror normal, delivers an error reduction typically in excess of 30 dB. After validation in the laboratory, the scheme is then applied to a genuinely challenging measurement scenario on a single cylinder racing motorcycle. Correction is theoretically perfect for translational mirror vibrations but angular mirror vibrations require an adapted scheme using a triplet of accelerometers arranged around a circular path on the mirror back-surface and this is set out theoretically.

Funding

The authors wish to acknowledge the support of GE Precision Engineering (http://www.geprecision-engineering.co.uk) for reporting and allowing access to the racing motorcycle engine vibration investigation.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Sound and Vibration

Volume

405

Pages

144 - 157

Citation

HALKON, B.J. and ROTHBERG, S., 2017. Restoring high accuracy to laser Doppler vibrometry measurements affected by vibration of beam steering optics. Journal of Sound and Vibration, 405, pp. 144-157.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

08/05/2017

Publication date

2017-06-02

Notes

This paper was accepted for publication in the journal Journal of Sound and Vibration and the definitive published version is available at http://dx.doi.org/10.1016/j.jsv.2017.05.014

ISSN

1095-8568;0022-460X

Language

en