这种传感元件是由作为热线的铂丝线圈(它既用作加热器,又用作检测器)、陶瓷载体、催化剂这三部分组成。作为材料,热线圈采用的是纯度为99.99％的铂丝或铂合金丝;载体是采用氧化铝或氧化硅的烧结体;催化剂采用铂和钯。制作的工艺流程如下(图1): This sensing element consists of a platinum wire coil as a hot wire, which acts both as a heater and as a detector, a ceramic carrier, and a catalyst. As a material, the heat coil is made of a platinum wire or a platinum alloy wire with a purity of 99.99%; the carrier is a sintered body made of alumina or silicon oxide; and the catalyst is made of platinum and palladium. Production process is as follows (Figure 1):