频谱激电测量仪器关键技术研究及实现
石加玉, 郭鹏, 李勇

Research and implementation of key technologies of spectral induced polarization instruments
SHI Jia-Yu, GUO Peng, LI Yong
图4 基于硬件电路的相位检测原理
Fig.4 Phase detection principle based on hardware circuit