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DISTRIBUTED LIQUID SENSOR USING ECCENTRICALLY CLADDED FIBER

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Abstract

An all-fiber distributed liquid sensor is desirable for fuel tanks and pipelines because it is intrinsically safe from explosions. In addition, long range sensing can be accomplised by taking advantage of its low transmission loss. The authors have reported the all-fiber distributed sensor with an eccentrically cladded fiber1,2, abbreviated as ECF hereinafter. The cross section of the ECF is shown in Figure 1. The refractive indices of the core, the cladding, and the external region are denoted by n1, n2, and n3, respectively. The radii of the core and the cladding are denoted by a1 and a2, respectively. The thickness of the thinnest part in the cladding is denoted by t. This structure allows high sensitivity and a large diameter to keep sufficient strength simultaneously. In our previous paper1,2, it was described that the numerical results of the absorbing loss sensitivity, and the experimental results of the radiation loss induced by liquids. This paper demonstrates 420-m long distributed liquid sensing by using an optical time domain reflectometer (OTDR).

© 1988 Optical Society of America

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