| abstract |
PROBLEM TO BE SOLVED: The problem to be solved by the present invention is essentially an explosion-proof structure and not only detects hydrogen leakage by making the detection part of the sensor long and linear, but also hydrogen It is an object of the present invention to provide a hydrogen sensor that can also obtain position information regarding a leaked portion. The hydrogen sensor of the present invention uses a tungsten oxide thin film carrying a platinum catalyst as a hydrogen sensitive substance, and the hydrogen sensitive portion is widely arranged in the longitudinal direction of the optical fiber. In the evanescent wave absorption method, the above thin film was controlled to be 500 nm or less in the core. In the FBG type sensor, a platinum catalyst-supported tungsten oxide powder was fixed to a thickness of 1 μm or more on the clad peripheral surface of the FBG portion. [Selection] Figure 1 |