本研究利用光纖低耗損、可傳輸距離長以及靈敏性佳的優點，將光纖應用於量測土石流發生時所造成的地表振動或稱為土石流地聲。本研究在南投縣信義鄉神木村愛與子溪架設一套土石流地聲光纖感測系統。此系統設有四個FBG光纖感測器、一台 光纖耦合器、一台光纖光柵解調儀及一組電腦伺服器。經多次測試，此系統能完整記錄土石流撞擊河床所產生之地表振動。土石流地聲光纖感測系統可將光纖拉至接近土石流發源區，能提早監測到土石流之發生。本系統之上上游光纖感測器距離儀器小屋約1.6公里，相較於傳統地聲檢知器最遠距離440公尺多了將近1.2公里，預估可提早120秒量測到土石流之發生。

Fiber-optic sensing technique can be used in long range measurement of vibration signal because of its high sensitivity and low optical loss. This study presents a fiber-optic sensing system used in monitoring ground vibrations generated by debris flows. The system which was deployed in observation site of debris flows near Ai-Yu-Zi Creek contained four FBG accelerometers, coupler, a demodulator and a computer. The FBG accelerometers were buried in the ground or in the construction, such as dam, along the Ai-Yu-Zi Creek. Artificial ground vibration was produced near each sensor, and the time of received signal and ground hitting were consistent to verify the functioning of the sensors and the system. By geometry of deployment, the fiber optic sensing system can be deployed about 1.6 km in the field, and it is 1.2 km longer than traditional system, e.g. geophone. Detection time of the occurrence of debris flow by fiber optic sensing system is earlier for hundred of seconds than by traditional way.

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