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14 February 2005 A novel stress and strain sensor based on triple-core photonic crystal fiber
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Photonic Crystal Fibers (PCFs) have recently attracted many attentions from research groups worldwide and many novel applications have been developed. We find that this kind of special fiber also enables various new possibilities for the construction of novel optical sensors that are highly compact and functional. In this paper, a novel stress and strain sensor based on triple-core PCF is proposed. The triple identical solid cores are triangularly arranged to detect the stress from different transverse directions as well as the strain in the longitudinal direction. Fiber cross-section structure variation due to stress is simulated in a PCF structure. Different mode distributions caused from stress in the triple-core structure is systematically investigated for the first time to the best of our knowledge. Meanwhile, output mode distribution sensitively changes with fiber length variation caused by strain. Relationship between sensitivity and fiber geometrical structure (fiber length, hole diameter, hole to hole center pitch distance) are explored and analyzed. We conclude that the PCF-based stress sensor exhibits many functionality and advantages such as totally single-mode operation, short length, strong sensitivity of strain, and good sensitivity of stress from all directions in the fiber cross-section. Furthermore, three identical endlessly single mode PCFs will be fused together and tapered to construct a triple-core structure. Various parameters are measured and tested upon this tapered trip-core PCF and the results will be published soon.
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Xia Yu and Ping Shum "A novel stress and strain sensor based on triple-core photonic crystal fiber", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005);

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