DEVELOPMENT OF OPTICAL FIBER SENSOR FOR INFRASTRUCTURES USING VIBRATING WIRE AND ELECTRIC RESONANCE CIRCUIT

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  • 構造物の計測のための光ファイバを用いたセンサの開発について

Abstract

This paper proposes two principles of extrinsic optical fiber sensors for civil infrastructures; and describes their prototype developments and their static/dynamic tests for future application. The first one employs a vibrating wire, and the second one employs an electric LC circuit. The tension of the wire is modulated by external force, and transformed into the change of the vibrating frequency. The oscillating frequency of the LC circuit changes as a core in a solenoid for an inductance moves. These resonant frequencies are optically detected, and transmitted through the optical fibers. The returned frequencies are dealt by a PLL circuit, with which frequencies of the driving optical pulses are adjusted as the same frequencies of the wire or the LC circuit.

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