酸化ビスマス系高屈折率光ファイバを用いた分布型水素漏えい検知センサの開発 Development of a distributed hydrogen gas sensor using bismuth oxide based optical fiber
An evanescent-wave absorption type fiber-optic hydrogen gas sensor for distributed leakage monitoring was developed. A platinum-supported tungsten trioxide (Pt⁄WO<sub>3</sub>) thin film as hydrogen sensitive material was successfully immobilized on periphery of bismuth based optical fiber by sol-gel method. The optical propagation loss of the device in air atmosphere was about 0. 25dB⁄m and much smaller than that of existing fiber-optic sensor devices which was composed of conventional silica based optical fiber. This improvement would result from high refractive index of bismuth based fiber. It is suggested that the sensor device with detection length in the range of several tens of meters would be realized. The sensing characteristics such as sensitivity and response speed were evaluated. In the presence of hydrogen, sharp sensor response based on the change in evanescent-wave absorption of sensing clad region was observed. Furthermore, reproducibility of the sensor with repeated exposure to hydrogen gas was good. The response speed strongly depended on the hydrogen concentration and first-order reaction kinetics with respect to the concentration was obtained. Finally, multipoint sensing performance was demonstrated. These results indicate that the proposed sensor is promising for a low-cost and distributed leakage monitoring.
- 圧力技術 = Pressure engineering : journal of Japan High Pressure Institute
圧力技術 = Pressure engineering : journal of Japan High Pressure Institute 50(4), 170-176, 2012-07-25
HIGH PRESSURE INSTITUTE OF JAPN(HPI)