Additional subtle changes include adjusted wait periods.
Removed filtering and up/downsampling.
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caf19bc468
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@ -124,8 +124,9 @@ def satrec_experiment(pars, run):
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PH3 = pars['PH3'][run%len(pars['PH3'])]
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PH2 = pars['PH2'][run%len(pars['PH2'])]
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PHA = pars['PHA']
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# set variable delay list for saturation pulses:
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SI = pars["SI"]
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SW = pars["SW"]
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# set variable delay list for saturation pulses:
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vdlist = log_range(D2, D1, NECH-1)
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# run the pulse sequence:
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@ -141,13 +142,13 @@ def satrec_experiment(pars, run):
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e.set_phase(PH3) # set phase for measuring pulse
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# recovery:
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e.wait(TAU) # recovery time
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e.wait(TAU-5e-7) # recovery time
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# detection:
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e.ttl_pulse(TXEnableDelay, value=TXEnableValue) # enable RF amplifier
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e.ttl_pulse(P90, value=TXEnableValue|TXPulseValue) # apply 90-degree pulse
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e.set_phase(PHA) # set phase for receiver
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e.wait(DEAD1) # wait for coil ringdown
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e.wait(DEAD1-5e-7) # wait for coil ringdown
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e.record(SI, SW, sensitivity=ADCSensitivity) # acquire signal
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# write experiment parameters:
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@ -11,17 +11,16 @@ def experiment(): # saturation-recovery with soild-echo detection
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pars = {}
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pars['P90'] = 2.3e-6 # 90-degree pulse length (s)
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pars['SF'] = 46.7e6 # spectrometer frequency (Hz)
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pars['O1'] = 5.6e3 # offset from SF (Hz)
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pars['SW'] = 10e6 # spectral window (Hz)
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pars['SI'] = 1*1024 # number of acquisition points
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pars['NS'] = 16 # number of scans
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pars['DS'] = 0 # number of dummy scans
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pars['TAU'] = 1 # delay for recovery (s)
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pars['D3'] = 20e-6 # echo delay (s)
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pars['D4'] = 0 # echo pre-aquisition delay (s)
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pars['D4'] = 0 # pre-aquisition delay (s), use negative values
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pars['PHA'] = -30 # receiver phase (degree)
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# -*- these ain't variable: -*-
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pars['NECH'] = 40 # number of saturation pulses
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pars['NECH'] = 7 # number of saturation pulses
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pars['D1'] = 100e-3 # starting interval in saturation sequence (s)
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pars['D2'] = 1e-4 # end interval in saturation sequence (s)
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pars['DATADIR'] = '/home/fprak/Students/' # data directory
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@ -48,8 +47,7 @@ def experiment(): # saturation-recovery with soild-echo detection
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raise Exception("Pulse too long!!!")
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if pars['NS']%8 != 0:
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pars['NS'] = int(round(pars['NS'] / 8) + 1) * 8
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print 'Number of scans changed to ',pars['NS'],' due to phase cycling'
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print 'Number of scans should be ',pars['NS'],' due to phase cycling'
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if pars['D1'] < pars['D2']:
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raise Exception("D1 must be greater than D2!")
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@ -120,7 +118,6 @@ def satrec2_experiment(pars, run):
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# read in variables:
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P90 = pars['P90']
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SF = pars['SF']
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O1 = pars['O1']
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NECH = pars['NECH']
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D1 = pars['D1']
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D2 = pars['D2']
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@ -132,21 +129,16 @@ def satrec2_experiment(pars, run):
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PH4 = pars['PH4'][run%len(pars['PH4'])]
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PH2 = pars['PH2'][run%len(pars['PH2'])]
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PHA = pars['PHA']
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SI = pars['SI']
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SW = pars['SW']
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# set variable delay list for saturation pulses:
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vdlist = log_range(D2, D1, NECH-1)
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# set sampling parameters:
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SI = pars['SI']
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SW = pars['SW']
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while SW <= 10e6 and SI < 256*1024:
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SI *= 2
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SW *= 2
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# the pulse sequence:
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# the pulse sequence:
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# saturation:
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e.set_frequency(SF+O1, phase=PH1) # set frequency and phase for saturation pulses
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e.set_frequency(SF, phase=PH1) # set frequency and phase for saturation pulses
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e.ttl_pulse(TXEnableDelay, value=TXEnableValue) # enable RF amplifier
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e.ttl_pulse(P90, value=TXEnableValue|TXPulseValue) # apply 90-degree pulse
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for delay in vdlist[::-1]:
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@ -154,19 +146,19 @@ def satrec2_experiment(pars, run):
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e.ttl_pulse(TXEnableDelay, value=TXEnableValue) # enable RF amplifier
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e.ttl_pulse(P90, value=TXEnableValue|TXPulseValue) # apply 90-degree pulse
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# recovery:
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e.wait(TAU) # wait for tau
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e.set_phase(PH3) # set phase for next pulse
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# recovery:
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e.wait(TAU-5e-7) # wait for tau
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# echo detection:
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e.ttl_pulse(TXEnableDelay, value=TXEnableValue) # enable RF amplifier
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e.ttl_pulse(P90, value=TXEnableValue|TXPulseValue) # apply 90-degree pulse
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e.wait(D3-P90-TXEnableDelay) # echo delay
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e.set_phase(PH4) # set phase for next pulse
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e.wait(D3-P90-TXEnableDelay-5e-7) # echo delay
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e.ttl_pulse(TXEnableDelay, value=TXEnableValue) # enable RF amplifier
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e.ttl_pulse(P90, value=TXEnableValue|TXPulseValue) # apply 90-degree pulse
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e.set_phase(PHA) # set phase for receiver
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e.wait(D3-P90/2+D4) # echo delay
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e.wait(D3-P90/2+D4-5e-7) # echo delay
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e.record(SI, SW, sensitivity=ADCSensitivity) # acquisition
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# write experiment attributes:
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@ -29,40 +29,6 @@ def result():
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# get actual sampling rate of timesignal:
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sampling_rate = timesignal.get_sampling_rate()
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# get user-defined spectrum width:
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spec_width = pars['SW']
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# specify cutoff frequency, in relative units:
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cutoff = spec_width / sampling_rate
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if cutoff < 1: # no filter applied otherwise
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# number of filter's coefficients:
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numtaps = 29
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# use firwin to create a lowpass FIR filter:
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fir_coeff = firwin(numtaps, cutoff)
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# downsize x according to user-defined spectral window:
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skip = int(sampling_rate / spec_width)
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timesignal.x = timesignal.x[::skip]
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for i in range(2):
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# apply the filter to ith channel:
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timesignal.y[i] = lfilter(fir_coeff, 1.0, timesignal.y[i])
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# zeroize first N-1 "corrupted" samples:
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timesignal.y[i][:numtaps-1] = 0.0
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# circular left shift of y:
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timesignal.y[i] = roll(timesignal.y[i], -(numtaps-1))
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# downsize y to user-defined number of samples (SI):
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timesignal.y[i] = timesignal.y[i][::skip]
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# update the sampling_rate attribute of the signal's:
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timesignal.set_sampling_rate(spec_width)
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# ----------------------------------------------------
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# rotate timesignal according to current receiver's phase:
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