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Software

   

Electrical Tomography

ELETOM is a software that performs the complete 2D inversion (and not the simple iterative deconvolution of the pseudo-sections) of surface electrical surveys with any measurement array  (Wenner, dipole-dipole, pole-dipole, pole-pole, user defined arrays, mixed arrays) with a maximum of 64 electrode positions that can be added as needed.

 

 

 

ELETOM uses the finite elements method (FEM) in two dimensions to model the subsurface’s electrical response.

The elements that define the grid are trapezoidal in form to enable to compensate any height difference between the electrode’s positions. The current dispersion in the third spatial dimension (perpendicular to section of interest) is considered by using Wannamaker’s correction.

With ELETOM it is not necessary to specify any parameter to construct the grid. One needs only to enter the positions and numbering of the electrodes used in the survey’s measurements.

The iterative algorithm used to perform the inversion is based on the minimisation of the mean square error between field data and the data simulated by the FEM, with the method proposed by Sasaki (1994).

The algorithm’s convergence is obtained by estimating a stabilisation (performed with the generalised reciprocal coefficients method) repeated during every iteration.

The reduction of the noise effect present in the data, is obtained with an iterative linear regression calculation (Ward, 1990) that enables to compensate for the fact that it is impossible to know the statistical variance of each measurement.

The result is given by a real resistivity section reconstructed with precision (in two dimensions) equal to the smallest halved inter-electrode distance, with the possibility to select a set of colour shadings in order to enhance the anomalies present in the subsurface in the best way possible. The results can be rendered as isoresistivity curves as well.

 

 
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