OLE_LDAc99.pdf (95.14 kB)
Download file

Developments in laser Doppler accelerometry (LDAc) and comparison with laser Doppler velocimetry

Download (95.14 kB)
journal contribution
posted on 04.12.2015, 15:02 by Steve RothbergSteve Rothberg, Alan Hocknell, Jeremy CouplandJeremy Coupland
This paper outlines the principles and early development of an interferometric technique for remote measurement of vibration acceleration — laser Doppler accelerometry (LDAc). One of the key advantages of LDAc over laser Doppler velocimetry (LDV) is its ability to measure extremely high vibration accelerations and shocks, effectively without limit, and this point is expanded upon in the paper. Early LDAc development showed how unwanted, velocity-dependent optical beats could occur on the photodetector but novel use of a frequency shifting device, whose primary purpose was for direction discrimination, was successful in isolating the required acceleration-dependent beat. A problem remained in the rate at which the velocity-dependent and acceleration-dependent beats broadened during target motion. In a further development, it was possible to 'select’ a back reflection to produce a velocity-dependent beat that was NOT modulated in the presence of target motion. The acceleration-dependent beat could then be demodulated and preliminary results are given to demonstrate this outcome.

Funding

The authors gratefully acknowledge the support of the Engineering and Physical Sciences Research Council during the period in which this work was carried out.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

OPTICS AND LASERS IN ENGINEERING

Volume

32

Issue

6

Pages

549 - 564 (16)

Citation

ROTHBERG, S., HOCKNELL, A. and COUPLAND, J.M., 1999. Developments in laser Doppler accelerometry (LDAc) and comparison with laser Doppler velocimetry. Optics and Lasers in Engineering, 32 (6), pp. 549 - 564.

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/

Publication date

1999

Notes

This article was accepted for publication in the journal, Optics and Lasers in Engineering [© Elsevier]. The definitive version is available at: http://dx.doi.org/10.1016/S0143-8166(00)00002-6.

ISSN

0143-8166

Language

en

Usage metrics

Keywords

Exports