Abstract
ABSTRACT In this paper we report the design and implementation of a multimode fiber sensing technique for displacement sensing. To exploit the spatial information contents for sensing, a multimode fiber specklegram sensor with a hetero-core fiber structure is used. The sensor utilizes the inner product of multimode fiber speckle fields, which is highly sensitive on the geometrical shape change of the sensing section. The sensitivity and the dynamic range of the displacement sensing are investigated for hetero-core structure fiber specklegram sensor and straight multimode fiber specklegram sensor. Itis found that the sensitivity of the hetero-core FSS offers sensitivity as high as 0.1 µ m, with a dynamic range of about 3 µ m, which is superior to straight structure multimode fiber FSS. Dynamic response of the hetero-core FSS for displacement sensing was also studied. Keywords: fiber specklegram, fiber sensing, hetero-core fiber, displacement sensing, multispeckle pattern
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