DOI: 10.3724/SP.J.1187.2013.00810

Journal of Electronic Measurement and Instrument (电子测量与仪器学报) 2013/27:9 PP.810-816

Research on the high precision resistivity probe with four point-electrodes for marine sediments

The resistivity of the marine sediment is an important parameter in modern marine geophysical survey. Aiming at the difficulties in high precision measurement of marine sediments resistivity,this paper conducted the research on resistivity measurement technique of the circular Wenner probe with four point-electrodes. The electric field intensity on the probe electrodes in the limited space inside the cylindrical sample was simulated by using the finite element method,and the optimization of the probe structure was realized. Then the electrode configuration factor in the existing literatures were corrected in order to make it applicable to nonideal point-electrode and sediment samples in the limited space. Finally,combined with the experiment of the probe to a standard KCl solution the accuracy of the probe was further verified. It is proved that this technology has the advantages of convenient,practical and reliable,and the relative error of measurement is less than 1%.

Key words:marine sediments,finite element,probe,resistivity

ReleaseDate:2014-07-21 17:02:07