The property of polarization is a nature of light. In this paper, the polarization of optical fiber sensor is mainly studied and the control of optical fiber polarization is achieved by using a controller of optical torsion polarization instead of coil type polarization controller. A novel combined optimum type of single-mode fiber interferometer is designed and the expression of output waveform is acquired through theoretical derivation. Accordingly, with MATLAB simulation, it can be analyzed and obtained that while the phase difference between the two arms of the interferometer is Δφ = 90°, the output light is not under the influence of the frequency doubling and it is the most sensitive at this moment . The performance of the developed optical fiber sensor system which is composed by the combined interferometer is verified by a preliminary test that we generate the AE (acoustic emission )signals by knocking a piece of marble slab, then the AE signals could be detected by the system. The test results demonstrate that the developed fiber-optic sensors have emerged as effective means of detecting AE signals, which solves the polarization fade-out problem using a controller of optical torsion polarization, then the output signals could be achieved with higher visibility.

Date Published: 29 August 2013
PDF: 8 pages
Proc. SPIE 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography, 89140P (29 August 2013); doi: 10.1117/12.2034005

Published in SPIE Proceedings Vol. 8914:
International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography
Yunjiang Rao, Editor(s)