Progress in the development of the laser Doppler accelerometer

Alan Hocknell; Jeremy M. Coupland; Steve J. Rothberg

doi:10.1117/12.307720

1 June 1998 Progress in the development of the laser Doppler accelerometer

Alan Hocknell, Jeremy M. Coupland, Steve J. Rothberg

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307720
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

This paper outlines the principles and early development of an interferometric technique for remote measurements of vibration acceleration--laser doppler accelerometry (LDAc). The LDAc principle is not only suited to use of an inexpensive laser source but it also simplifies use for the inexpert user by removal of the requirement to match optical paths to maintain coherence. One of the most important advantages of LDAc over existing technology will be its ability to measure extremely high vibration accelerations and shocks, effectively without limit. Early development has shown how back reflections within the optical geometry are responsible for creating unwanted, velocity-dependent optical beats on the photodetector as well as the unsuitability of coherence and polarization to isolate the required acceleration-dependent beat. Novel use of a frequency shifting device, whose primary purpose is for direction discrimination, was successful in isolating the acceleration-dependent beat from the velocity-dependent beats but a problem remained in the rate at which the two beats broadened during target motion. In a further development, based again on the location of the frequency- shifting device, it was possible to 'select' a back reflection to produce a beat that was NOT modulated in the presence of target motion. The acceleration-dependent beat could then be demodulated and preliminary result are given to demonstrate this outcome.

Citation Download Citation

Alan Hocknell, Jeremy M. Coupland, and Steve J. Rothberg "Progress in the development of the laser Doppler accelerometer", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307720

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available