This commit is contained in:
Arne van Iterson 2024-04-11 14:40:33 +02:00
commit 778b6ea158
13 changed files with 70 additions and 3 deletions

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60
scripts/crosstalk.py Normal file
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@ -0,0 +1,60 @@
from matplotlib import pyplot as plt
from matplotlib import patches as pat
import numpy as np
import reader
# load data
data_reader = reader.Reader()
num = 14
data = data_reader.read_file(f".\data\T00{num}ALL.csv")
str_end = 'Near end' if num % 2 == 0 else 'Far end'
str_desc = '230 Ohm'
# FFT
np_data1 = np.array(data['CH1'])
np_data2 = np.array(data['CH2'])
np_time = np.array(data['TIME'])
X1 = np.fft.rfft(np_data1)
X2 = np.fft.rfft(np_data2)
N = np.fft.rfftfreq(len(np_data1), (np_time[1]-np_time[0]))
phi1 = np.angle(X1, True)
phi2 = np.angle(X2, True)
diff_phi = phi1[np.argmax(abs(X1))]-phi2[np.argmax(abs(X2))]
fig, ax = plt.subplots()
plt.plot(data['TIME'], data['CH1'], label='CH1')
plt.plot(data['TIME'], data['CH2'], label='CH2')
handles, labels = ax.get_legend_handles_labels()
patch = pat.Patch(
color='C0',
label='pk-pk = ${:.2f}\ V$'.format(max(data['CH1'])-min(data['CH1'])))
handles.append(patch)
patch = pat.Patch(
color='C1',
label='pk-pk = ${:.2f}\ V$'.format(max(data['CH2'])-min(data['CH2'])))
handles.append(patch)
patch = pat.Patch(
color='C0',
label='F = ${:.1f}\ MHz$'.format(N[np.argmax(abs(X1))]/1e6))
handles.append(patch)
patch = pat.Patch(
color='C1',
label='F = ${:.1f}\ MHz$'.format(N[np.argmax(abs(X2))]/1e6))
handles.append(patch)
patch = pat.Patch(
color='grey',
label='$\Delta \phi$ = ${:.1f} \degree$'.format(diff_phi))
handles.append(patch)
plt.title('Voltage vs Time, ' + str_desc + ', ' + str_end)
plt.legend(loc='upper right', handles=handles)
plt.grid()
plt.xlabel('Time [s]')
plt.ylabel('Voltage [V]')
plt.xlim(data['TIME'][0], data['TIME'][-1])
name = f'Graph - {str_desc} - {str_end}.png'
plt.savefig(f'./doc/crosstalk/img/{name}')
print('Saved:', name)
# plt.show()

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@ -14,4 +14,4 @@ def cut_time(data : dict, start : float, end : float) -> dict:
if idx_end != 0 and idx_start != 0: if idx_end != 0 and idx_start != 0:
return {key: value[idx_start:idx_end] for key, value in data.items()} return {key: value[idx_start:idx_end] for key, value in data.items()}
else: else:
return None raise Exception("Start or end out of range")

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@ -7,7 +7,8 @@ class Reader():
def read_file(self, filename) -> dict: def read_file(self, filename) -> dict:
with open(filename, 'r') as file: with open(filename, 'r') as file:
data = list(csv.reader(file, delimiter=',')) data = list(csv.reader(file, delimiter=','))
# Delete metadata for now # Delete metadata for now
for i in range(15): for i in range(15):
data.pop(0) data.pop(0)

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@ -6,7 +6,7 @@ import helper
# load data # load data
data_reader = reader.Reader() data_reader = reader.Reader()
data = data_reader.read_file(r".\data\T0004CH1.csv") data = data_reader.read_file(r".\data\T0001CH1.csv")
# slice empty space, start and end time is in seconds # slice empty space, start and end time is in seconds
data = helper.cut_time(data, -1e-7, 5e-7) data = helper.cut_time(data, -1e-7, 5e-7)
@ -41,5 +41,11 @@ if len(peaks) > 0:
peak*step+data['TIME'][0], peak*step+data['TIME'][0],
min(data['CH1']), min(data['CH1']),
max(data['CH1']), 'red', 'dashed') max(data['CH1']), 'red', 'dashed')
plt.xlabel('Time [s]')
plt.ylabel('Voltage [V]')
plt.title('Voltage vs Time, $75 \Omega$ cable')
plt.tight_layout()
txt="$\Delta t\ =\ {:.2f}\ ns $".format(tim_diff*1e9)
plt.figtext(0.54, 0.01, txt, wrap=True, horizontalalignment='center', fontsize=9)
plt.grid() plt.grid()
plt.show() plt.show()