The equipment used in our field study is IP Receiver DDJ-1made by the Beijing Geological Instrument Factory. It can measure IP discharge secondary field for a long time and give K type induced polarization sounding ηs curve of three layered horizontal strata .
赵聚林. IP找水与DDJ-1型仪器野外数据采集[J]. 物探与化探, 2003, 27(4): 302-304.
ZHAO Ju-lin . IP WATER EXPLORATION AND FILED DATA ACQUISITION OF DDJ-1 IP DEVICE. Geophysical and Geochemical Exploration, 2003, 27(4): 302-304.