Electrical Methods Conductivity File
Conductivity files are used to specify the conductivity (either real or complex) of each element in the computational mesh. Conductivity files are produced during mesh generation and inversion, but can also be user generated. The order of conductivity values listed in the conductivity file is the same order as the listing of the elements in the elements file produced by tetgen. There are no naming requirements for the input conductivity file, but they generally end with <.sig> in the E4D documentation and examples.
See File Syntax Rules for specific details.
| Variable Name | Description |
|---|---|
| n_sigma n_col
(int) (int) |
n_sigma is the number of conductivity values (must be equal to the number of elements in the mesh)
n_col is the number of columns in the file (1 for ERT) |
| sigma
(int) |
 repeat for n_sigma
sigma is the conductivity value for each element |
ERT Example
4 1 n_sigma ncol 0.01 sigma_1 conductivity value for element 1 0.01 sigma_2 conductivity value for element 2 0.01 ... 0.01
| Variable Name | Description |
|---|---|
| n_sigma n_col
(int) (int) |
n_sigma is the number of conductivity values (must be equal to the number of elements in the mesh)
n_col is the number of columns in the file (2 for SIP) |
| sigma isigma
(int) (int) |
repeat for n_sigma
sigma is the real conductivity value in S/m isigma is the imaginary conductivity value in S/m |
SIP Example
4 2 n_sigma ncol 0.01 0.0001 sigma_1 isigma_1 conductivity values for element 1 0.01 0.0001 sigma_2 isigma_2 conductivity values for element 2 0.01 0.0001 ... 0.01 0.0001