OPTICAL FIBER FLOW VELOCITY SENSOR FOR RIVER BED CORROSION, AND FLOW VELOCITY MEASURING SYSTEM THEREFOR

摘要

PROBLEM TO BE SOLVED: To measure a river bed corrosion condition and a flow velocity in surroundings of corrosion concurrently at a remote site.;SOLUTION: This optical fiber velocity sensor for river bed corrosion is provided with cylindrical casings 11 buried in the river bed or a high-water channel, along depth direction separated with a prescribed space, and formed with a plurality of opening parts 12 directed to the upstream of a river, and pressure detecting parts 20a-20h having FBGs 24a-24f provided respectively to block the opening parts 12 inside the cylindrical casing 11. In the system, soil pressure or water pressure is detected by converting reflected wavelengths in the FBGs 24a-24f into distortion quantities by an optical velocity sensor 40 for the corrosion connected to the remote site, and the corrosion depth of the river bed and the velocity of the water flow are measured thereby.;COPYRIGHT: (C)2004,JPO