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1·The threshold voltage is set by output channel comprised of pulse generator, photoelectric coupler and F/V converter, and the detection result is input through photoelectric coupler.

利用可变频脉冲发生器、光电耦合器和F/V转换器组成输出通道，设定阀值；

2·The lower machine mainly includes infrared sensors, photoelectric coupler, FPGA, wireless transmission module; the upper machine mainly includes wireless transmission module, PC and the software.

下位机主要由红外传感器、光电耦合器、FPGA、无线传输模块组成，上位机主要由无线传输模块、PC机以及相应软件组成。