| 摘要 |
PURPOSE:To detect a reducing gas in mixed gas accurately, by providing a means, which detects the concentration of hydrogen or compound including hydrogen based on the change in light absorbing characteristics, providing a means, which detects the concentration of the reducing gas including hydrogen or compound including hydrogen, and obtaining the difference in detected values of both means. CONSTITUTION:A means, which detects light absorbing characteristics corresponding to the concentration of hydrogen or compound gas including hydrogen is a sensor element 1 having a laminated structure of, e.g., a catalyst-metal semitransparent film 2 using Pd as a metal that adsorbs and dissociates the gas, a chromic material film 3 using WO3 and a transparent conducting film 4 using ITO. In order to detect the change in light absorbance of the element 1, a light emitting element 6 is provided and driven by a light emitting power source 7. With respect the transmitted light through the element 1, the light is received by a light receiving element 8. Hydrogen or compound gas including hydrogen is detected by a detecting circuit 9 for the hydrogen or the compound gas including hydrogen. Meanwhile, a reducing gas such as CO is detected together with the hydrogen or the compound including hydrogen by a circuit 11 for detecting a current between the films 2 and 4 of the element 1. The signals from the circuits 9 and 11 are processed by a judging part 12, and the concentration of the reducing gas CO or the like is detected. |
