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Z1 = np.empty(self.fb_resistor.shape)
Z1.fill(np.nan)
# convert to masked array
Z1 = np.ma.masked_invalid(Z1)
R2 = self.calibration.R_fb[self.fb_resistor[ind]]
C2 = self.calibration.C_fb[self.fb_resistor[ind]]
Z1[ind] = compute_from_transfer_function(self.calibration.hw_version
.major, 'Z1',
V1=self.V_total()[ind],
V2=self.V_fb[ind], R2=R2,
C2=C2, f=self.frequency)
Z1 = np.ma.masked_invalid(pd.Series(Z1, pd.to_datetime(self.time, unit='s')
).interpolate(method='time').values)
Z1.fill_value = np.nan
Z1.data[Z1.mask] = Z1.fill_value
# if we're filtering and we don't have a window size specified,
# automatically determine one
if filter_order and window_size is None:
window_size = self._get_window_size(tol)
# if the filter_order or window size is None or if the window size is
# smaller than filter_order + 2, don't filter
if (filter_order is None or window_size is None or window_size < filter_order + 2):
pass
else:
# if the window size is less than half the sample length
if window_size and window_size < len(Z1) / 2:
# suppress polyfit warnings
with warnings.catch_warnings():
warnings.simplefilter(""ignore"")
Z1 = savgol_filter(Z1, window_size, filter_order)
else: # fit a line
result = self.mean_velocity(tol=tol)
if result['dt'] and \
result['dt'] > 0.1 * self.time[-1] and result['p'][0] > 0:
if self.calibration._c_drop:
c_drop = self.calibration.c_drop(self.frequency)
else:
c_drop = self.capacitance()[-1] / self.area
if self.calibration._c_filler:
c_filler = self.calibration.c_filler(self.frequency)
else:
c_filler = 0
x = result['p'][0]*self.time + result['p'][1]
C = self.area * (x * (c_drop - c_filler) / \
np.sqrt(self.area) + c_filler)
Z1 = 1.0 / (2.0 * math.pi * self.frequency * C)
Z1[mlab.find(self.time==result['t_end'])[0]+1:] = \
Z1[mlab.find(self.time==result['t_end'])[0]]
else:
Z1 = np.mean(Z1)*np.ones(Z1.shape)
return Z1"
949,"def force(self, Ly=None):
'''
Estimate the applied force (in Newtons) on a drop according to the
electromechanical model [1].
Ly is the length of the actuated electrode along the y-axis
(perpendicular to the direction of motion) in milimeters. By
default, use the square root of the actuated electrode area,
i.e.,
Ly=Lx=sqrt(Area)
To get the force normalized by electrode width (i.e., in units
of N/mm), set Ly=1.0.
1. Chatterjee et al., ""Electromechanical model for actuating liquids in
a two-plate droplet microfluidic device,"" Lab on a Chip, no. 9
(2009): 1219-1229.
'''
if self.calibration._c_drop:
c_drop = self.calibration.c_drop(self.frequency)
else:
c_drop = self.capacitance()[-1] / self.area
if self.calibration._c_filler:
c_filler = self.calibration.c_filler(self.frequency)
else:
c_filler = 0
if Ly is None:
Ly = np.sqrt(self.area)
return 1e3 * Ly * 0.5 * (c_drop - c_filler) * self.V_actuation()**2"
950,"def capacitance(self, filter_order=None, window_size=None, tol=0.05):
'''
Compute the capacitance of the DMF device _(i.e., dielectric and
droplet)_ based on the computed impedance value.
Note: this assumes impedance is purely capacitive load.
TODO: Is this assumption ok?
'''
C = np.ma.masked_invalid(1.0 / (2.0 * math.pi * self.frequency *
self.Z_device(filter_order=filter_order,
window_size=window_size, tol=tol)))
C.fill_value = np.nan
C.data[C.mask] = C.fill_value
return C"
951,"def x_position(self, filter_order=None, window_size=None, tol=0.05,
Lx=None):
'''