def replot(self, to_plot):
time_beginning = time()
if self._should_reposition_reset_view_button:
self._should_reposition_reset_view_button = False
self.position_reset_view_button()
if (
time_beginning - self.last_plot_time <= self.plot_rate_limit
and not self._plot_paused
):
# don't plot too often at it only causes unnecessary load
# this does not apply if plot is paused, because in this case we want
# to collect all the data that we can get in order to pass it to the
# autolock
return
self.last_plot_time = time_beginning
# NOTE: this is necessary if OpenGL is activated. Otherwise, the
# plot is way too small. This command apparently causes a repaint
# and works fine even though the values are nonsense.
if not self._fixed_opengl_bug:
self._fixed_opengl_bug = True
self.resize(
self.parent().frameGeometry().width(),
self.parent().frameGeometry().height(),
)
if self.parameters.pause_acquisition.value:
return
if to_plot is not None:
to_plot = pickle.loads(to_plot)
if to_plot is None:
return
if not check_plot_data(self.parameters.lock.value, to_plot):
return
# we also call this if the laser is not locked because it resets
# the history in this case
history, slow_history = self.update_signal_history(to_plot)
if self.parameters.lock.value:
self.signal1.setVisible(False)
self.signal2.setVisible(False)
self.control_signal.setVisible(True)
self.control_signal_history.setVisible(True)
self.slow_history.setVisible(self.parameters.pid_on_slow_enabled.value)
self.monitor_signal_history.setVisible(
not self.parameters.dual_channel.value
)
self.combined_signal.setVisible(True)
self.signal_strength_a.setVisible(False)
self.signal_strength_b.setVisible(False)
self.signal_strength_a2.setVisible(False)
self.signal_strength_b2.setVisible(False)
self.signal_strength_a_fill.setVisible(False)
self.signal_strength_b_fill.setVisible(False)
error_signal, control_signal = (
to_plot["error_signal"],
to_plot["control_signal"],
)
all_signals = (error_signal, control_signal, history, slow_history)
self.plot_data_locked(to_plot)
self.plot_autolock_target_line(None)
else:
dual_channel = self.parameters.dual_channel.value
self.signal1.setVisible(True)
monitor_signal = to_plot.get("monitor_signal")
error_signal_2 = to_plot.get("error_signal_2")
self.signal2.setVisible(
error_signal_2 is not None or monitor_signal is not None
)
self.combined_signal.setVisible(dual_channel)
self.control_signal.setVisible(False)
self.control_signal_history.setVisible(False)
self.slow_history.setVisible(False)
self.monitor_signal_history.setVisible(False)
s1 = to_plot["error_signal_1"]
s2 = error_signal_2 if error_signal_2 is not None else monitor_signal
combined_error_signal = combine_error_signal(
(s1, s2),
dual_channel,
self.parameters.channel_mixing.value,
self.parameters.combined_offset.value,
)
if self._plot_paused:
self._cached_plot_data.append(combined_error_signal)
# don't save too much
self._cached_plot_data = self._cached_plot_data[-20:]
return
all_signals = [s1, s2] + [combined_error_signal]
self.last_plot_data = all_signals
self.plot_data_unlocked((s1, s2), combined_error_signal)
self.plot_autolock_target_line(combined_error_signal)
if self.parameters.modulation_frequency.value != 0:
# check whether to plot signal strengths using quadratures
s1q = to_plot.get("error_signal_1_quadrature")
s2q = to_plot.get("error_signal_2_quadrature")
self.signal_strength_a.setVisible(s1q is not None)
self.signal_strength_a2.setVisible(s1q is not None)
self.signal_strength_a_fill.setVisible(s1q is not None)
self.signal_strength_b.setVisible(s2q is not None)
self.signal_strength_b2.setVisible(s2q is not None)
self.signal_strength_b_fill.setVisible(s2q is not None)
if s1q is not None:
max_signal_strength_V = (
self.plot_signal_strength(
s1,
s1q,
self.signal_strength_a,
self.signal_strength_a2,
self.signal_strength_a_fill,
self.parameters.offset_a.value,
self.parameters.plot_color_0.value,
)
/ V
)
all_signals.append(
[
max_signal_strength_V * V,
-1 * max_signal_strength_V * V,
]
)
self.signal_power1.emit(
peak_voltage_to_dBm(max_signal_strength_V)
)
else:
self.signal_power1.emit(INVALID_POWER)
if s2q is not None:
max_signal_strength2_V = (
self.plot_signal_strength(
s2,
s2q,
self.signal_strength_b,
self.signal_strength_b2,
self.signal_strength_b_fill,
self.parameters.offset_b.value,
self.parameters.plot_color_1.value,
)
/ V
)
all_signals.append(
[
max_signal_strength2_V * V,
-1 * max_signal_strength2_V * V,
]
)
self.signal_power2.emit(
peak_voltage_to_dBm(max_signal_strength2_V)
)
else:
self.signal_power2.emit(INVALID_POWER)
else:
self.signal_strength_a.setVisible(False)
self.signal_strength_b.setVisible(False)
self.signal_strength_a2.setVisible(False)
self.signal_strength_b2.setVisible(False)
self.signal_strength_a_fill.setVisible(False)
self.signal_strength_b_fill.setVisible(False)
self.signal_power1.emit(INVALID_POWER)
self.signal_power2.emit(INVALID_POWER)
time_end = time()
time_diff = time_end - time_beginning
new_rate_limit = 2 * time_diff
if new_rate_limit < DEFAULT_PLOT_RATE_LIMIT:
new_rate_limit = DEFAULT_PLOT_RATE_LIMIT
self.plot_rate_limit = new_rate_limit
def react_to_new_spectrum(self, plot_data):
"""React to new spectrum data.
If this is executed for the first time, a reference spectrum is
recorded.
If the autolock is approaching the desired line, a correlation
function of the spectrum with the reference spectrum is calculated
and the laser current is adapted such that the targeted line is centered.
After this procedure is done, the real lock is turned on and after some
time the lock is verified.
If automatic relocking is desired, the control and error signals are
continuously monitored after locking.
"""
if self.parameters.pause_acquisition.value:
return
if plot_data is None or not self.parameters.autolock_running.value:
return
plot_data = pickle.loads(plot_data)
if plot_data is None:
return
is_locked = self.parameters.lock.value
# check that `plot_data` contains the information we need
# otherwise skip this round
if not check_plot_data(is_locked, plot_data):
return
if is_locked:
error_signal = plot_data['error_signal']
control_signal = plot_data['control_signal']
else:
combined_error_signal = combine_error_signal(
(plot_data['error_signal_1'], plot_data['error_signal_2']),
self.parameters.dual_channel.value,
self.parameters.channel_mixing.value)
try:
if self.parameters.autolock_approaching.value:
# we have already recorded a spectrum and are now approaching
# the line by decreasing the scan range and adapting the
# center current multiple times.
if self.approacher is None:
self.approacher = Approacher(self.control,
self.parameters,
self.first_error_signal,
self.target_zoom,
allow_ramp_speed_change=True)
approaching_finished = self.approacher.approach_line(
combined_error_signal)
if approaching_finished:
self._lock()
elif self.parameters.autolock_watching.value:
# the laser was locked successfully before. Now we check
# periodically whether the laser is still in lock
return self.watch_lock(error_signal, control_signal)
else:
# we are done with approaching and have started the lock.
# skip some data and check whether we really are in lock
# afterwards.
return self.after_lock(error_signal, control_signal,
plot_data.get('slow'))
except SpectrumUncorrelatedException:
print('spectrum uncorrelated')
if self.parameters.watch_lock.value:
print('retry')
self.relock()
else:
self.exposed_stop()
self.parameters.autolock_failed.value = True
except Exception:
traceback.print_exc()
self.exposed_stop()
def replot(self, to_plot):
# NOTE: this is necessary if OpenGL is activated. Otherwise, the
# plot is way too small. This command apparently causes a repaint
# and works fine even though the values are nonsense.
if not self._fixed_opengl_bug:
self._fixed_opengl_bug = True
self.resize(self.parent().frameGeometry().width(),
self.parent().frameGeometry().height())
if self.parameters.pause_acquisition.value:
return
if to_plot is not None and not self.touch_start:
to_plot = pickle.loads(to_plot)
if to_plot is None:
return
if not check_plot_data(self.parameters.lock.value, to_plot):
return
# we also call this if the laser is not locked because it resets
# the history in this case
history, slow_history = self.update_control_signal_history(to_plot)
if self.parameters.lock.value:
self.last_plot_data = to_plot
self.signal1.setVisible(False)
self.signal2.setVisible(False)
self.control_signal.setVisible(True)
self.control_signal_history.setVisible(True)
self.slow_history.setVisible(
self.parameters.pid_on_slow_enabled.value)
self.combined_signal.setVisible(True)
error_signal, control_signal = to_plot[
'error_signal'], to_plot['control_signal']
all_signals = (error_signal, control_signal, history,
slow_history)
self.plot_data_locked(to_plot)
self.update_plot_scaling(all_signals)
self.plot_autolock_target_line(None)
else:
dual_channel = self.parameters.dual_channel.value
self.signal1.setVisible(True)
self.signal2.setVisible(dual_channel)
self.combined_signal.setVisible(dual_channel)
self.control_signal.setVisible(False)
self.control_signal_history.setVisible(False)
self.slow_history.setVisible(False)
s1, s2 = to_plot['error_signal_1'], to_plot['error_signal_2']
combined_error_signal = combine_error_signal(
(s1, s2), dual_channel,
self.parameters.channel_mixing.value)
all_signals = [s1, s2] + [combined_error_signal]
self.last_plot_data = all_signals
self.plot_data_unlocked((s1, s2), combined_error_signal)
self.plot_autolock_target_line(combined_error_signal)
self.update_plot_scaling(all_signals if dual_channel else [s1])
def react_to_new_spectrum(self, plot_data):
"""React to new spectrum data.
If this is executed for the first time, a reference spectrum is
recorded.
If the autolock is approaching the desired line, a correlation
function of the spectrum with the reference spectrum is calculated
and the laser current is adapted such that the targeted line is centered.
After this procedure is done, the real lock is turned on and after some
time the lock is verified.
If automatic relocking is desired, the control and error signals are
continuously monitored after locking.
"""
if self.parameters.pause_acquisition.value:
return
if plot_data is None or not self.parameters.autolock_running.value:
return
plot_data = pickle.loads(plot_data)
if plot_data is None:
return
is_locked = self.parameters.lock.value
# check that `plot_data` contains the information we need
# otherwise skip this round
if not check_plot_data(is_locked, plot_data):
return
try:
if not is_locked:
combined_error_signal = combine_error_signal(
(plot_data["error_signal_1"],
plot_data.get("error_signal_2")),
self.parameters.dual_channel.value,
self.parameters.channel_mixing.value,
self.parameters.combined_offset.value,
)
if (self.autolock_mode_detector is not None
and not self.autolock_mode_detector.done):
self.autolock_mode_detector.handle_new_spectrum(
combined_error_signal)
self.additional_spectra.append(combined_error_signal)
if self.autolock_mode_detector.done:
self.start_autolock(self.autolock_mode_detector.mode)
else:
return
return self.algorithm.handle_new_spectrum(
combined_error_signal)
else:
error_signal = plot_data["error_signal"]
control_signal = plot_data["control_signal"]
return self.after_lock(error_signal, control_signal,
plot_data.get("slow"))
except Exception:
traceback.print_exc()
self.parameters.autolock_failed.value = True
self.exposed_stop()