Development of a distributed fiber-optic chemical sensor device

研制了一种用于分布式泄漏监测的倏逝波吸收型光纤氢气传感器。采用溶胶-凝胶法成功地将铂负载的三氧化钨（Pt/WO_3）薄膜作为氢敏材料固定在铋基光纤的外围。在有氢存在的情况下，基于传感覆层区域的倏逝波吸收变化，观察到尖锐的传感器响应。此外，重复暴露于氢气的传感器的再现性很好。最后，对多点传感性能进行了验证。这些结果表明，该传感器有望实现低成本的分布式泄漏监测。

An evanescent-wave absorption type fiber-optic hydrogen gas sensor for distributed leakage monitoring was developed. A platinum-supported tungsten trioxide(Pt/WO_3) thin film as hydrogen sensitive material was successfully immobilized on periphery of bismuth based optical fiber by sol-gel method. 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. Finally, multipoint sensing performance was demonstrated. These results indicate that the proposed sensor is promising for a low-cost and distributed leakage monitoring.