File size: 2,349 Bytes
7df9186 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | import argparse
import numpy
from numpy import exp, pi
from matplotlib import pyplot
# Style might look a little weird
# It's (almost) a line-by-line transcription of a .m file
def make_check(fname, show_plots=False):
d = numpy.loadtxt(fname)
npt = len(d)
d = d.transpose()
den = 33
n2 = int(npt/den)
dt = 14.0/1320 # us
n3 = n2*den
ix = numpy.arange(n3) + 1
# t = dt*ix
# mr = d[0][0:n3] + 1j*d[1][0:n3] # multiplier result
# st = d[2][0:n3] + 1j*d[3][0:n3] # state
# pr = d[4][0:n3] # probe reflection
rf = d[5][0:n3]
# m2 = d[6][0:n3] # voltage magnitude squared
lo = exp(-ix*2*pi*1j*7/den)
rx = rf*lo
rxr = numpy.reshape(rx, [n2, den])
rxa = numpy.mean(rxr, 1)
t2 = dt*den*(numpy.arange(n2)+0.5)
kx = numpy.nonzero(t2 > 8)
pp = numpy.polyfit(t2[kx], numpy.angle(rxa[kx]), 1)
detune = pp[0]/(2*pi)
print('phase slope %.2f kHz' % (detune*1e3))
if show_plots:
pyplot.plot(t2, rxa.real, label='real')
pyplot.plot(t2, rxa.imag, label='imag')
pyplot.plot(t2, abs(rxa), label='abs')
pyplot.legend()
pyplot.xlabel(u't (\u03bcsec)')
pyplot.title('cav_mode.v pulse response')
pyplot.savefig('cav_mode_check1.png')
pyplot.clf()
pyplot.plot(t2, numpy.angle(rxa), label='phase simulated')
ss = 'phase fit, slope %.2f kHz' % (detune*1e3)
pyplot.plot(t2[kx], numpy.polyval(pp, t2[kx]), label=ss)
pyplot.legend()
pyplot.xlabel(u't (\u03bcsec)')
pyplot.ylabel('radians')
pyplot.savefig('cav_mode_check2.png')
mech_freq = 2000000 # pasted from cav_mode_tb.v
detune_theory = -mech_freq/(2**32*dt) # XXX negative is ugly
err = detune/detune_theory-1
print('err = %g' % err)
return abs(err) > 0.004
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Test cav_mode')
parser.add_argument('-c', '--check', action='store_true', default=True,
help='Purely run the check')
parser.add_argument('-s', '--simulate', action='store_true',
help='Show plots based on simulation')
args = parser.parse_args()
if make_check('cav_mode.dat', show_plots=args.simulate):
print('FAIL')
exit(1)
else:
print('PASS')
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