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Proceedings Paper

Two-core optical fiber and its sensing characteristics
Author(s): Xue Wang; Shigang Zhao; Libo Yuan
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Paper Abstract

Two-core fiber is a specially designed fiber which contains a pair of parallel fiber core surrounding a cladding with diameter 125μm. A multi-parameters measurement technique that uses a two-core fiber as the sensing element has been proposed and demonstrated in this paper. The theory and the structure design are also introduced. The two-core fiber acts as a two-beam interferometer, in which phase differences is a function of curvature, and the twisting angle in the plane containing the cores results in the shift of the far-field interferometric fringe pattern. This sensor can be used to inspect the structural health monitoring, the measuring angle and the distinguishing direction. Compared to the traditional multi-beam interferometer, this sensor has the such characteristics as small size, good interference, high definition and steady fringe pattern. It does not need considering the effect of the environment temperature. A low-coherence laser diode at wavelength 650nm illuminating the two-cores and the interferogram pattern in the far-field is recorded by a CCD camera. The model of two-core fiber sensor has been established theoretically. The relationship between the far-field fringe pattern intensity distribution and the changes due to the radius of the curvature and the twisting angle are given, and the experimental results also confirmed this.

Paper Details

Date Published: 26 November 2007
PDF: 10 pages
Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68301A (26 November 2007); doi: 10.1117/12.755662
Show Author Affiliations
Xue Wang, Harbin Engineering Univ. (China)
Shigang Zhao, Harbin Engineering Univ. (China)
Libo Yuan, Harbin Engineering Univ. (China)

Published in SPIE Proceedings Vol. 6830:
Advanced Sensor Systems and Applications III
Yun-Jiang Rao; Yanbiao Liao; Gang-Ding Peng, Editor(s)

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