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CORIM Continuous Profiling Resistivity System

Case History

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  • Continuous Profile Resistivity Measurement
  • Real Time Data Display
  • Investigation Depth of 3 Meters
  • Rapid Data Collection

The CORIM System consists of a trolley that supports the system controller and power supply, along with distance measuring device and notebook PC, attached to up to seven capacitive electrodes, and a final transmitting electrode, each with their electronics. The system may be pulled by hand, or by a vehicle, at speeds up to a few kilometers per hour.

With it's continuous data collection capability the CORIM system may find applications for measurement of earth resistivity in cases where other geophysical techniques may not be appropriate, such as areas of high clay content, or excessive cultural noise. The CORIM system can be expected to make measurements with a 3-4 meter depth limit, with a resolution of about 0.3 meter.

The electrode carpets consist of one meter spaced capacitive plate electrodes with a receiver unit mounted on each. Each receiver then connects to the system controller in the trolley. One of the electrode carpets functions as the transmitter and contains an independent transmitter with its own battery pack. A spare transmitter battery pack may be kept on the trolley and recharged from the main system, so that it is ready when needed.

Mounted on one of the trolley wheels is an optical pulse encoder to measure distance and trigger readings every 0.2 to 10 meters. The acquisition software displays vehicle speed and warning messages when the speed is too fast. Control of the system is from the PC via a serial port connection. System status, including battery voltages, are displayed on the PC.

During system setup the Compensation routine may be run. This measurement calculates the local SP effect and zeros this for data analysis. The Compensation measurement may be made several times on a profile in order to correct for changes in surface conditions.

As data acquisition begins the apparent resistivity values calculated for each electrode carpet, or channel, are continuously displayed, either digitally, or as a series of profiles. A marker function allows the operator to mark fiducial points for later reference.

The CORIM View software is used to filter and display the final data. Data may be displayed and printed as either a series of line profiles or as a pseudosection. Data may be displayed as either raw data, or as Compenstation(SP) corrected data.

Standard Components

6 Receiver dipole carpets, 1 transmitter dipole carpet, 6 receiver electronics, 1 transmitter electronics, transmitter battery, receiver controller, main rechargeable battery, battery chargers for main, and transmitter batteries, distance encoder, trolley, spare parts kit, software and manual.