In situ Measurements of the Electric Rock Parameters by Means of a Wenner Four-Point Arrangement.
Scientific rept. no. 1,
INNSBRUCK UNIV (AUSTRIA) ELECTRONICS LAB
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Different electrode materials for rock contacting purposes were tested and their efficiencies were compared. For a wattless collection of the potentials of the two inner points of a Wenner four-point arrangement impedance transformers with very high input resistance and low capacitance were applied. Earthing and screening problems were investigated. Measurements were conducted in a frequency range of 0.01 ... 10,000 Hz, the current density in the centerpoint of the arrangement amounted to j 10 to the minus 10 power Acm sq. Author
- Geology, Geochemistry and Mineralogy