使用锁相环消除ECT系统的附加相移误差

Elimination of ECT system's additional phase shift error by PLL

在两相流电容层析成像(ECT)系统中,被测小电容经过C/V变换电路后转换成的高频信号与另一路严格同频同相的信号进行同步检波而得到被测信号,因此硬件装置中移相电路的输出必须精确地与检测信号达到同步,提出的锁相环电路能够很好地解决这一问题.

In two-phase flow electrical capacitance tomography system, it requires that the output of the phase shift circuit in the hardware device and the detected signal are synchronous in high precision. But in fact, it is limited to reach synchronous by calculating phase degree. This paper puts forward phase locked loop can resolve these problems well.