Abstract
This article proposes an optical fiber hydrogen (H2) sensor based on photothermal reflectance [hereinafter modulated optical reflectance (MOR)] technique. Our H2 sensor is based on a technique that detects the changes of MOR signals in palladium film, which is widely known to absorb H2 gas. The sensor element is a palladium film deposited on a 2.5-mm-diameter FC-ferrule made from zirconium to realize the optical fiber sensor. Our recently developed "laptop" MOR instrument assembled with optical fiber components is applied to this technique. Thus, an extremely compact photothermal H2 gas sensor system can be constructed. We certified that our technique has hypersensitive less than 1% with a concentration of H2 gas and also demonstrated that the response time is approximately 5 seconds when the sensor head is filled with H2 gas.
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