In situ Measurements of the Electric Rock Parameters by Means of a Wenner Four-Point Arrangement.
Abstract
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 A/cm sq. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 03, 1974
- Accession Number
- AD0781839
Entities
People
- Cristoph Grissemann
- Michael Oberladstatter
- Norbert Nessler
Organizations
- University of Innsbruck