simpeg.electromagnetics.time_domain.sources.TrapezoidWaveform#

class simpeg.electromagnetics.time_domain.sources.TrapezoidWaveform(ramp_on, ramp_off, off_time=None, **kwargs)[source]#

Bases: BaseWaveform

A waveform that has a linear ramp-on and a linear ramp-off.

Parameters:

ramp_on(2) array_like of float: time when the linear ramp_on starts and stops
ramp_off(2) array_like of float: time when of the ramp_off starts and stops
off_timefloat: time when the transmitter_current returns to zero

Attributes

`epsilon`	Window of time within which the waveform is considered on
`has_initial_fields`	Whether the waveform has initial fields.
`off_time`	Off-time
`ramp_off`	times over which the transmitter ramps off.
`ramp_on`	times over which the transmitter ramps on.

time_nodes

Methods

`eval`(time)	Evaluate current waveform at a given time
`eval_deriv`(time)	Evaluate the time derivative of the linear ramp-off waveform at given times

Examples

>>> import matplotlib.pyplot as plt
>>> import numpy as np
>>> from simpeg.electromagnetics import time_domain as tdem

>>> times = np.linspace(0, 1e-2, 1000)
>>> waveform = tdem.sources.TrapezoidWaveform(ramp_on=[0.0, 2e-3], ramp_off=[4e-3, 6e-3])
>>> plt.plot(times, [waveform.eval(t) for t in times])
>>> plt.show()