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noptica2-sdr
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improve speed and reliability of laser lock

master
Sebastien Bourdeauducq 2020-08-16 17:44:36 +08:00
parent d41493934b
commit dadd09d914
1 changed files with 11 additions and 5 deletions
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16
noptica.py
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@ -112,13 +112,16 @@ class Stabilizer:
self.freq_target = freq_target
self.cb = cb
self.amp_counter = 0
self.lock_counter = 0
self.unlock_counter = 0
self.wiggle = 0.0
self.tuning = 0.0
self.amp_threshold = 80.0
self.k = 30.0e-6
self.tolerance = 10e3
self.amp_counter_threshold = 60
self.lock_counter_threshold = 60
self.unlock_counter_threshold = 500
self.wiggle_amplitude = 0.15
@ -132,14 +135,16 @@ class Stabilizer:
if amplitude > self.amp_threshold:
freq = self.freqs[i]
delta = freq - self.freq_target
tuning = delta*self.k
self.amp_counter += 1
if self.amp_counter > self.amp_counter_threshold:
self.tuning = delta*self.k
if abs(delta) < self.tolerance:
success = True
else:
freq = None
tuning = 0.0
self.amp_counter = 0
max_tuning_abs = 0.5 - self.wiggle_amplitude - 1e-9
tuning = max(min(tuning, max_tuning_abs), -max_tuning_abs)
self.tuning = max(min(self.tuning, max_tuning_abs), -max_tuning_abs)
if success:
self.lock_counter += 1
@ -151,11 +156,12 @@ class Stabilizer:
else:
self.unlock_counter += 1
if not success and (self.unlock_counter > self.unlock_counter_threshold):
print("wiggle")
self.wiggle = self.wiggle_amplitude*np.random.uniform(-1.0, 1.0)
print("wiggle", self.wiggle)
self.unlock_counter = 0
self.amp_counter = 0
self.cb(spectrum, freq, self.locked(), tuning + self.wiggle)
self.cb(spectrum, freq, self.locked(), self.tuning + self.wiggle)
def locked(self):
return self.lock_counter > self.lock_counter_threshold