Induced Polarization (IP)

Induced polarization (IP) phenomena were first observed in 1912 by Conrad Schlumberger, where electrically conductive materials exhibited a delayed voltage response after an applied current was switched off. IP parameters respond to disseminated mineral grains and chargeability is measured by sending a pulsating current to create ion exchange between mineral grains and pore fluids. When the current stops, the voltage drops and dissipates gradually over time. IP measurements use similar equipment to resistivity surveys and the two techniques are usually conducted together.