In recent years, a large number of floods accompanied by serious damage have occurred over all lands of Japan as secondary disaster being triggered by topical heavy rainfall and earthquake. In order to abate the amount of damage or injury, the importance of measurement instruments such as the rain gauge, the water level gauge, the flow rate meter are getting higher and higher. We have done research and development to apply an optical fiber sensor, which is reliable and does not require a power source, to those instruments. In this paper, we introduce our new flow velocity meter using the FBG sensors and the result of field tests by using it.%近年、国内における局所的な豪雨や地震などによる二次災害として洪水や浸水などの水害が広い範囲で発生している。その対策として重要な計測器である雨量計、水位計及び流量計に無電源で動作し信頼性の高い光ファイバセンサを適用すべく研究開発を進めてきた。今回、流量計測に必要な流速計をFBGセンサを用いて開発し、実フィールドにおける試験を実施し、その有効性検証と実用化検討を行ったので報告する。
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