Source code for labscript_utils.unitconversions.linear_coil_driver

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# linear_coil_driver.py                                             #
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# Copyright 2013, Monash University                                 #
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# This file is part of the labscript suite (see                     #
# http://labscriptsuite.org) and is licensed under the Simplified   #
# BSD License. See the license.txt file in the root of the project  #
# for the full license.                                             #
#                                                                   #
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from .UnitConversionBase import *
import numpy as np

[docs]class BidirectionalCoilDriver(UnitConversion): base_unit = 'V' derived_units = ['A']
[docs] def __init__(self, calibration_parameters=None): # These parameters are loaded from a globals.h5 type file automatically if calibration_parameters is None: calibration_parameters = {} self.parameters = calibration_parameters # I[A] = slope * V[V] + shift # Saturates at saturation Volts self.parameters.setdefault('slope', 1) # A/V self.parameters.setdefault('shift', 0) # A self.parameters.setdefault('saturation', 10) # V UnitConversion.__init__(self,self.parameters)
# We should probably also store some hardware limits here, and use them accordingly # (or maybe load them from a globals file, or specify them in the connection table?)
[docs] def A_to_base(self,amps): #here is the calibration code that may use self.parameters volts = (amps - self.parameters['shift']) / self.parameters['slope'] return volts
[docs] def A_from_base(self,volts): volts = np.minimum(volts, self.parameters['saturation']) amps = self.parameters['slope'] * volts + self.parameters['shift'] return amps
[docs]class UnidirectionalCoilDriver(BidirectionalCoilDriver):
[docs] def A_to_base(self,amps): return BidirectionalCoilDriver.A_to_base(self, amps)* np.int16(amps>0)
[docs] def A_from_base(self,volts): return BidirectionalCoilDriver.A_from_base(self, volts)* np.int16(volts>0)