| 摘要 |
A sensor device for gaseous hydrocarbons comprises two semiconductor oxide-based sensitive elements, one of which is a sensitive reference element and the other a sensitive measuring element, this latter being covered with a layer of electrically insulating porous material containing a dispersed noble metal. The two sensitive elements are formed by silk-screen processes, are connected to an electronic signal comparison system, and are maintained at different temperatures when in operation. The sensor has improved selectivity in determining gaseous hydrocarbons, in particular methane, even if high concentrations of interfering gases such as ethanol are present. <IMAGE> |
