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Proceedings Paper

Passive interferometric optical fiber sensor using 3x3 directional coupler
Author(s): Changchun Li; Fei Luo
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Paper Abstract

It is significant to study and employ interferometric optical fiber sensors which are most sensitive to measurand and can be used to measure some critical parameters of measurands, it is, however, not practical because of the difficulties that lie in the aspect of interferometric signal demodulation, which may be overcome by several different ways extensively studied such as active homodyne phase detection, passive homodyne phase detection and heterodyne phase detection. Passive homodyne phase detection for interferometric sensors uses a passive optical element to provide optical pi/2 phase shift output, the measurand induced phase change is recovered by the detection electronics. A 3 multiplied by 3 directional coupler can be used to obtain the optical pi/2 phase shift output and hence to form interferometric optical sensor. In this article, fundamental principles of the sensor were analyzed using it, which possess characteristics of all-optical fiber, high- sensitivity, high-distinctiveness and easy integration, strain measurements were completed. The experimental results were given and also characteristics of the sensor were analyzed.

Paper Details

Date Published: 24 September 1996
PDF: 7 pages
Proc. SPIE 2895, Fiber Optic Sensors V, (24 September 1996); doi: 10.1117/12.252214
Show Author Affiliations
Changchun Li, Nanjing Univ. of Aeronautics and Astronautics (China)
Fei Luo, Nanjing Univ. of Aeronautics and Astronautics (China)


Published in SPIE Proceedings Vol. 2895:
Fiber Optic Sensors V
Kim D. Bennett; Byoung Yoon Kim; Yanbiao Liao, Editor(s)

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