Characterization of mechanical vibrations in composite materials with a fiber optic multichannel interferometer

Jose Antonio Garcia Souto; Horacio Lamela

doi:10.1117/12.388102

12 June 2000 Characterization of mechanical vibrations in composite materials with a fiber optic multichannel interferometer

Jose Antonio Garcia Souto, Horacio Lamela

Author Affiliations +

Proceedings Volume 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (2000) https://doi.org/10.1117/12.388102
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

In this paper we present the results of our experiment for the characterization of mechanical vibrations, using a multichannel interferometer with sensing optical fibers embedded into a carbon fiber board. We investigate the application of this measurement system for dynamic gradients of vibrations at medium frequency (50 Hz to 1 kHz). The optical phase is biased to operate at quadrature conditions (optical phase = π/2) in order to get the maximum sensitivity. We measure the differential optical phase of four spatially separated embedded fiber-optic channels relative to a common reference path. The tests are the calibration of the sensor response to vibrations and the spatial propagation of vibrations. This scheme provides an improvement of previous characterizations with strain gages at the surface because of the high sensitivity of the sensor, better spatial resolution (separation of the sensing regions up to 5 mm), and measurements performed inside the board. The signal processing required for phase measurements is also analyzed, as well as it is presented a comparison with the electronic measurements at the surface.

Citation Download Citation

Jose Antonio Garcia Souto and Horacio Lamela "Characterization of mechanical vibrations in composite materials with a fiber optic multichannel interferometer", Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); https://doi.org/10.1117/12.388102

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