Exercise 6

Calculate the geometric factors, measured voltage differences and signal-to-noise ratio (SNR, the ratio of the field measured voltage difference to the noise) for a Wenner and dipole-dipole array based on the information given (fill out the table below).

Current injected [I]: 2 mA

Apparent resistivity [ρ]: 250 ohm-m

Noise level: 15 mV

Array a(m) n Kg V(mV) SNR
Wenner 5
Dipole-dipole 3 3

Click for solution to exercise 6


Electrical Imaging for Hydrogeology Copyright © 2022 by Kamini Singha, Timothy C. Johnson, Frederick D. Day Lewis and Lee D. Slater. All Rights Reserved.