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Proceedings Paper

New scheme of Sagnac interferometric fiber-optic current sensor insensible to mechanical vibration
Author(s): Jie Mu; Wei Zhao; Jia Wang; Jin-tao Xu
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Paper Abstract

A new scheme of Sagnac interferometer fiber-optic current sensor insensible to mechanical vibration is presented. This scheme eliminates the Sagnac effect, which is responsible for the sensitivity to vibration according to theoretical analysis with Jones matrix. The improvement to the conventional Sagnac interferometer fiber-optic current sensor is achieved by changing the structure of sensing fiber coil. This coil is fabricated by the bifilar winding technique, and it consists of one half-wave plate embedded in the middle of sensing optical fiber and one quarter-wave plate rotated by 90 degrees in its lower input port. Experimental results suggest that, compared to the conventional design, this new-structured Sagnac interferometer fiber-optic current sensor has much better performance against strong mechanical vibration at accelerations up to 20 g and frequencies from 10 to 400 Hz. Furthermore, the current measurement accuracy of the improved fiber-optic current sensor achieves the 0.2-level at an acceleration of 20 g and a frequency of 150 Hz.

Paper Details

Date Published: 12 October 2010
PDF: 6 pages
Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76563W (12 October 2010); doi: 10.1117/12.863862
Show Author Affiliations
Jie Mu, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate Univ. of CAS (China)
Wei Zhao, Xi'an Institute of Optics and Precision Mechanics (China)
Jia Wang, Xi'an Institute of Optics and Precision Mechanics (China)
Jin-tao Xu, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 7656:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Jose M. Sasian; Libin Xiang; Sandy To, Editor(s)

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