bfieldtools.thermal_noise.compute_current_modes¶
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bfieldtools.thermal_noise.compute_current_modes(obj, T, resistivity, thickness, mode='AC', freqs=array([0]), Nmodes=None, return_eigenvals=False, **kwargs)¶ Calculates the (AC or DC) Johnson noise current modes on the conducting surface.
- Parameters
- obj: Trimesh-object or MeshConductor-object
Represents the boundary on which current density is specified or MeshConductor object that wraps the mesh
- T: float
Temperature in Kelvins
- resistivity: float or array (Nfaces)
Resistivity value in Ohm/meter
- thickness: float or array (Nfaces)
Thickness of the surface. NB! Must be small in comparison to observation distance
- mode: ‘AC’ or ‘DC’
Calculate modes as a function of frequency or just at DC?
- freqs: Nfreqs array
The frequencies at which the eddy-current modes are computed. Obsolete for ‘DC’ mode. In ‘AC’, calculate at DC in default.
- Nmodes: int
How many modes are computed? If None, all Nvertices modes are computed
- return_eigenvals: boolean
Return also the eigenvalues (the inverse circuit time constants)?
- kwargs: dict
Passed to Conductor creation if a Trimesh object is passed as ‘obj’
- Returns
- vl: (Nvertices x Nmodes x Nfreqs) (AC) or (Nvertices x Nmodes) (DC) array
The spectral eddy-current modes
- u: Nmodes array
The eigenvalues