六十年代以来,半导体气敏元件在国际上有了引人注目的发展。这种元件的灵敏度很高,只要气氛中含有不到千分之一的待测气体,其电阻值就产生足够大的变化。使用这种半导体气敏元件的检测器灵敏度高、结构简单,不需放大电路而通过简单电路就可得到足够大的输出信号;它使用方便,价格 Since the 1960s, the semiconductor gas sensor has a remarkable development in the world. The sensitivity of such components is high, as long as the atmosphere contains less than one-thousandth of the gas to be measured, the resistance value will have a large enough change. The detector using the semiconductor gas sensor has high sensitivity, simple structure, and can obtain a sufficiently large output signal through a simple circuit without amplifying the circuit; it is convenient to use and the price