1709 光ファイバ振動・ひずみセンサの開発 : 平板への適用(J08-2 光ファイバセンサとその応用,J08 知的材料・構造システム)

概要

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We have developed fiber optic strain and vibration sensors (FOSVS) suited for health monitoring of structures. A fiber optic gap sensor made of multi-mode fibers, broad-band light, two photo detectors and an FBG filter were used to compose the sensor system. The gap sensor was composed of a cantilever fiber and a reflector fiber. The axial displacement of the sensor was measured from the reflected interfered signal. The amplitude of the transmitted signal through the reflector fiber was used to measure the transverse vibration of the cantilever fiber. In this paper, we developed the miniature sensor in terms of easy-handling and attached it on a plate specimen. Then a tensile test and vibration tests of the specimen were conducted. From the experimental and theoretical results, it appeared that the sensor could measure the axial strain and the transverse acceleration applied to the speciment correctly.
2005-09-18