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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journal contribution
posted on 2017-06-29, 12:34 authored by Ben Halkon, Steve RothbergLaser 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 VibrationVolume
405Pages
144 - 157Citation
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
© ElsevierVersion
- 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
2017-05-08Publication date
2017-06-02Notes
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.2017.05.014ISSN
1095-8568;0022-460XPublisher version
Language
- en