OLE_LDAc99.pdf (95.14 kB)
Developments in laser Doppler accelerometry (LDAc) and comparison with laser Doppler velocimetry
journal contribution
posted on 2015-12-04, 15:02 authored by Steve Rothberg, Alan Hocknell, Jeremy CouplandJeremy CouplandThis 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 ENGINEERINGVolume
32Issue
6Pages
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
© 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/Publication date
1999Notes
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
0143-8166Publisher version
Language
- en