Fiber optic velocity sensor for monitoring of structural vibrations

Larry Fabiny; Alan D. Kersey

doi:10.1117/12.240872

30 May 1996 Fiber optic velocity sensor for monitoring of structural vibrations

Larry Fabiny, Alan D. Kersey

Proceedings Volume 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation; (1996) https://doi.org/10.1117/12.240872
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

We describe a fiber optic velocity sensor which performs non contact measurements of structural vibrations. The sensor responds directly to the velocity of the sample structure rather than the associated displacement or acceleration through measurement of the Doppler- induced frequency shift of light reflected from the vibrating structure. Light from a single- frequency laser is launched into a fiber optic system which serves the dual role of delivering light to the structure and recollecting the frequency shifted reflected light. The frequency shift, which is proportional to the sample velocity, is processed with a fiber optic Mach-Zehnder interferometer with a relative optical path imbalance. The maximum detectable velocity of the sensor is greater than 1 km/s and is scalable over several orders of magnitude with changes in the fiber optic interferometer. Resolution of the velocity sensor is 80 micrometer/second/(root)Hz.

Citation Download Citation

Larry Fabiny and Alan D. Kersey "Fiber optic velocity sensor for monitoring of structural vibrations", Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996); https://doi.org/10.1117/12.240872

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