Characterization of a conventional optic fiber (monomode and multimode) and its use for the elaboration of a new vibration and sonor pressure detection system

Nicolas Javahiraly; Antoine Lebrun; Ayoub Chakari

doi:10.1117/12.803160

17 June 2008 Characterization of a conventional optic fiber (monomode and multimode) and its use for the elaboration of a new vibration and sonor pressure detection system

Nicolas Javahiraly, Antoine Lebrun, Ayoub Chakari

Author Affiliations +

Proceedings Volume 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 709815 (2008) https://doi.org/10.1117/12.803160
Event: Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2008, Ancona, Italy

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.

Citation Download Citation

Nicolas Javahiraly, Antoine Lebrun, and Ayoub Chakari "Characterization of a conventional optic fiber (monomode and multimode) and its use for the elaboration of a new vibration and sonor pressure detection system", Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 709815 (17 June 2008); https://doi.org/10.1117/12.803160

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KEYWORDS

Geometrical optics

Modulation

Multimode fibers

Polarization

Birefringence

Sensors

Vibrometry

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