54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
# -*- coding: iso-8859-1 -*-
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from numpy import *
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def result():
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# loop over the incoming results:
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for timesignal in results:
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if not isinstance(timesignal,ADC_Result):
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continue
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# get list of parameters:
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pars = timesignal.get_description_dictionary()
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# make a copy of timesignal:
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fid = timesignal + 0
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# correct for the baseline offset:
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fid.baseline()
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# compute the initial phase:
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phi0 = arctan2(fid.y[1][0], fid.y[0][0]) * 180 / pi
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# do FFT:
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fid.exp_window(line_broadening=10)
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spectrum = fid.fft(samples=2*pars['SI'])
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spectrum.baseline()
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spectrum.phase(-phi0)
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# provide timesignal and spectrum to the display tab:
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data['Timesignal'] = timesignal
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data["Spectrum"] = spectrum
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# ------------- optional measurements: --------------
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# measure signal intensity:
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signal = (timesignal +0).phase(-phi0)
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signal_intensity = sum(signal.y[0:10])
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# measure spectrum integral:
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#spectrum_integral = cumsum(spectrum.y[0])
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spectrum_magnitude = (spectrum+0).magnitude()
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spectrum_integral = cumsum(spectrum_magnitude.y[0])
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# find the centre of gravity of the spectrum:
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cg = argwhere(spectrum_integral > 0.5*spectrum_integral[-1])[0]
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print ''
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print '%s%.3e'%('FID intensity = ', signal_intensity)
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print '%s%.3e'%('Spectrum integral = ', spectrum_integral[-1])
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print '%s%g%s'%("Spectrum middle frequency = ", spectrum.x[cg], ' Hz')
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print ''
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pass |