スマートストラクチャ概念の船体構造への適用に関する基礎研究 : 第1報, 光ファイバによる変位と損傷の検出方法の検討

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Applicability of a smart structure concept to marine structure is discussed in the present paper. Fiber-optic velocity sensor has been developed based on the Laser-Doppler effect. The novel method has some advantages to marine structure, such as (1) long gage length, (2) temperature independent output and (3) excellent dynamic response, which are not achieved in conventional interferometric fiber-optic sensors. Deformation of tensile specimens under cyclic load, vibration of cantilever beam specimens were measured with the fiber-optic velocity sensor, and the results were compared with those of strain gages. Good performance of the fiber-optic velocity sensor was demonstrated in the present experiments. OTDR (Optical Time Domain Reflectometer) has been applied to detection of damages in the specimens. Tensile test of single optical fiber embedded in a resin, tensile and flexure tests of glass fiber reinforced composite specimens were carried out, and the damages of an embedded optical fiber were detected by OTDR. Relations between reflection response with OTDR and applied strain in the resin and composite specimens were examined experimentally, and the effects of materials and stacking sequence of laminates and loading conditions on OTDR response were investigated.
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