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24 September 1996 Passive interferometric optical fiber sensor using 3x3 directional coupler
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Proceedings Volume 2895, Fiber Optic Sensors V; (1996)
Event: Photonics China '96, 1996, Beijing, China
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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Changchun Li and Fei Luo "Passive interferometric optical fiber sensor using 3x3 directional coupler", Proc. SPIE 2895, Fiber Optic Sensors V, (24 September 1996);

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