scholarly journals The effect of electrode contact resistance and capacitive coupling on complex resistivity measurements

2006 ◽  
Author(s):  
Thomas Ingeman‐Nielsen
Keyword(s):  
Contact Resistance ◽  
Capacitive Coupling ◽  
Complex Resistivity ◽  
Resistivity Measurements ◽  
Electrode Contact

On: “Recent Advances and Applications in Complex Resistivity Measurements,” by K. L. Zonge and J. C. Wynn (GEOPHYSICS, Oct. 1975, p. 851–864)

Geophysics ◽  
1977 ◽  
Vol 42 (1) ◽  
pp. 120-121 ◽  
Author(s):  
P. H. Nelson ◽  
G. D. Van Voorhis
Keyword(s):  
Spectral Data ◽  
Induced Polarization ◽  
Complex Resistivity ◽  
Resistivity Measurements ◽  
Recent Advances ◽  
Measuring Techniques

In presenting a variety of induced polarization spectral data, Zonge and Wynn refer to a paper published earlier by us (Van Voorhis et al., 1973) which deals with the same topic. We feel Zonge and Wynn have misrepresented our measuring techniques, data, and conclusions in their references to our paper. Our principal objections center on three statements by the authors.

scholarly journals Numerical Modeling of the Effects of Electrode Spacing and Multilayered Concrete Resistivity on the Apparent Resistivity Measured Using Wenner Method

2020 ◽  
Author(s):  
Karthick Thiyagarajan ◽  
Parikshit Acharya ◽  
Lasitha Piyathilaka ◽  
sarath kodagoda
Keyword(s):  
Contact Area ◽  
Apparent Resistivity ◽  
Resistivity Measurement ◽  
Gaussian Process Regression ◽  
Electrode Spacing ◽  
Electrical Resistivity Measurement ◽  
Resistivity Measurements ◽  
Electrode Contact ◽  
Concrete Resistivity ◽  
Moisture Conditions

Smart Sensing technologies can play an important role in the conditional assessment of concrete sewer pipe linings. In the long-term, the permeation of acids can deteriorate the pipe linings. Currently, there are no proven sensors available to non-invasively estimate the depth of acid permeation in real-time. The electrical resistivity measurement on the surface of the linings can indicate the sub-surface acid moisture conditions. In this study, we consider acid permeated linings as a two resistivity layer concrete sample, where the top resistivity layer is assumed to be acid permeated and the bottom resistivity layer indicates normal moisture conditions. Firstly, we modeled the sensor based on the four-probe Wenner method. The measurements of the developed model were compared with the previous studies for validation. Then, the sensor model was utilized to study the effects of electrode contact area, electrode spacing distance and two resistivity layered concrete on the apparent resistivity measurements. All the simulations were carried out by varying the thickness of top resistivity layer concrete. The simulation study indicated that the electrode contact area has very minimal effects on apparent resistivity measurements. Also, an increase in apparent resistivity measurements was observed when there is an increase in the distance of the electrode spacing. Further, a machine learning approach using Gaussian process regression modeling was formulated to estimate the depth of acid permeated layer

Reply to discussion by P. H. Nelson and G. D. Van Voorhis by authors

Geophysics ◽  
1977 ◽  
Vol 42 (1) ◽  
pp. 121-123
Author(s):  
K. L. Zonge ◽  
J. C. Wynn
Keyword(s):  
Phase Model ◽  
Spectral Measurements ◽  
Field Surveys ◽  
Complex Resistivity ◽  
Resistivity Measurements ◽  
Standard Field ◽  
Recent Advances

The main objectives of “Recent Advances and Applications in Complex Resistivity Measurements” were to demonstrate the utility of making spectral measurements in standard field surveys and to show that rocks have characteristic signatures which do not conform to the constant phase model advocated by Nelson and Van Voorhis. We can understand the questions arising out of the relative inaccuracy statement.

Complex resistivity measurements in field using a pseudo‐noise source

1994 ◽  
Author(s):  
T. R. M. Prasad ◽  
B. D. Ramaiah ◽  
S. C. Jain ◽  
B. S. Reddy
Keyword(s):  
Noise Source ◽  
Complex Resistivity ◽  
Resistivity Measurements ◽  
Pseudo Noise
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