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Proceedings Paper

Characterization of a conventional optic fiber (monomode and multimode) and its use for the elaboration of a new vibration and sonor pressure detection system
Author(s): Nicolas Javahiraly; Antoine Lebrun; Ayoub Chakari
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Paper Abstract

Accurate vibration measurement of mechanical structures is a relevant problem in aerospace or automotive industry and sismic detection. Used methods concern for instance non guided optics devices, contact resistive systems, contact mechanical systems. We introduce a modelling and an experimental validation of an intrinsic vibration sensor using polarization modulation of the light propagation in an optical fiber as a result of modulated constraints applied to this fiber. We demonstrate that this method allow measurements of vibration frequencies with a good accuracy and a large dynamic. We first analyze the intrinsic birefringence in telecom monomode fiber. Then, we analyze the extrinsic birefringence coming from twisting and bending the fiber. On this basis, we introduce a polarisation controller. We then apply a static force on the fiber through a spring. With vibration applied to the fiber, this force will become dynamic and will induce a dynamic modulation of the polarization at the output of the fiber that we will read. The optimal signal sensing of sound and vibration is obtained by integrating all the characteristics of the device mentioned above.

Paper Details

Date Published: 17 June 2008
PDF: 12 pages
Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 709815 (17 June 2008); doi: 10.1117/12.803160
Show Author Affiliations
Nicolas Javahiraly, Louis Pasteur Univ. (France)
Antoine Lebrun, Louis Pasteur Univ. (France)
Ayoub Chakari, Louis Pasteur Univ. (France)

Published in SPIE Proceedings Vol. 7098:
Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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