simpeg.electromagnetics.natural_source.receivers.ApparentConductivity

class simpeg.electromagnetics.natural_source.receivers.ApparentConductivity(locations_e, locations_h=None, storeProjections=False)

Bases: _ElectricAndMagneticReceiver

Receiver class for simulating apparent conductivity data (3D problems only).

This class is used to simulate an apparent conductivity datum, in S/m, as defined by:

\[\sigma_{app} = \mu_0 \omega \dfrac{\bar{H}^2}{ \bar{E} ^2}\]

where \(\omega\) is the angular frequency in rad/s,

\[\bar{H} \big |^2 = \big | \vec{H}^{(x)} \big |^2 + \big | \vec{H}^{(y)} \big |^2\]

and

\[\bar{E}^2= \Big [ \big | E_x^{(x)} \big |^2 + \big | E_y^{(x)} \big |^2 \Big ] = \Big [ \big | E_x^{(y)} \big |^2 + \big | E_y^{(y)} \big |^2 \Big ]\]

Parameters:

locations_e(n_loc, n_dim) array_like

Locations where the electric fields are measured.

locations_h(n_loc, n_dim) array_like, optional

Locations where the magnetic fields are measured. Defaults to the same locations as electric field measurements, locations_e.

storeProjectionsbool

Whether to cache to internal projection matrices.

Attributes

locations	Locations of the two field measurements.
locations_e	Electric field measurement locations
locations_h	Magnetic field measurement locations
nD	Number of data associated with the receiver object.
uid	Universal unique identifier

Methods

eval(src, mesh, f)	Compute receiver data from the discrete field solution.
evalDeriv(src, mesh, f[, du_dm_v, v, adjoint])	Derivative of data with respect to the fields.
getP(mesh, projected_grid[, location_id])	Get projection matrix from mesh to specified receiver locations.

Notes

It is important to take the amplitudes of the fields resulting from x and y planewave polarizations separately, then summing. Adding the fields from x and y planewaves then summing can result in simulated anomalies which do not presented entirely over conductive/resistive targets.