The clock and data pulsation signals from upper sensor heads can be received using pin diode , then , amplified and inverted in logical control unit for the purpose of cpu operation . hereinafter , the digital signal will be delivered into the central processing unit ( cpu ) for related calculation , and meanwhile transmitted to a d / a converter for signal recovery after filter and phase - shift circuit 通过采用pin管接收从传感头传递下来的时钟脉冲和数据脉冲信号,并将它们放大整形传送到逻辑控制单元,产生逻辑控制信号,再将数字信号传送给d / a转换器,设计了滤波器和移相器电路,还原出了原始的被采样信号。