745 光ファイバ振動/音響センサの耐熱性について  [in Japanese] The Application of New Fiber-Optic Vibration Sensor at Elevated Temperature  [in Japanese]

A new fiber-optic vibration sensor has been developed and applied to structural health monitoring. The sensor is based on a new finding that frequency of light wave transmitted through a bended optical fiber is shifted by vibration at the bended region. Because this sensing principle is independent of the temperature, this sensor is available in hot condition in theoretical sense. The sensor can detect AE signals and elastic wave propagation in the material located in high-temperature condition without any characteristic changes. The durable, low-cost and high-sensitive sensor can show a new scope to structural health monitoring in the very variety of applications, especially in high-temperature conditions.