| 摘要 |
A catalytic-combustion sensor has a rigid support having a flat support face, a metallic resistance-type heater film flatly adhered to the support face, and a catalyst film flatly adhered in heat-transmitting connection to the heater film. The heater element is made of platinum or gold and the catalyst film is made of a platinum-group compound such as a palladium-, platinum, rhodium-, or iridium-compound, in an arrangement used to detect methane, although different materials can be used for other gases such as propane or butane. Normally a diffusion-blocking layer overlies the catalyst film. The heater film is a strip following a nonstraight, normally meandering, path on the support face and support is a rigid bar having a back face opposite to the support face and formed thereon in registration with the nonstraight heater film with a rearwardly open groove that reduces the thickness of the bar at the heater film. The thickness of the support is reduced to the minimum necessary to have sufficient rigidity to keep the support from breaking up when in use and to reduce the thermal mass of the support in the region of the heater strip. |
