MO03 - edge polished:
Turbo off, QPD centered, before excitation (60 seconds)
PDT: 2016-08-23 08:42:54.514987
PDT UTC: 2016-08-23 15:42:54.514987
UTC GPS: 1156002191.514987
Excitation (white uniform noise, amplitude 5 V)
PDT: 2016-08-23 08:45:01.007626 PDT
UTC: 2016-08-23 15:45:01.007626 UTC
GPS: 1156002318.007626
Clean data for ring-down
PDT: 2016-08-23 08:45:46.448949 PDT
UTC: 2016-08-23 15:45:46.448949 UTC
GPS: 1156002363.448949
Restarted roughing pump, QPD got misaligned
PDT: 2016-08-23 10:00:29.259345 PDT
UTC: 2016-08-23 17:00:29.259345 UTC
GPS: 1156006846.259345
MO03 - edge polished:
Band-limited noise, +-10Hz around eahc nominal frequency, amplitude scaled based on the inverse of the peak height obtained with white noise. See attached code and plot
from numpy import *
from noise import *
x = loadtxt('/home/controls/Measurements/2016_08_23/mo_02_laserpolished_frequencies.txt')
freqs = x[:,0]
ampl = x[:,1]
bw = 10
bands = map(lambda x: [x - bw, x + bw], freqs)
a = 1 / (ampl/max(ampl))
a[a>50] = 50.
x = multi_band_noise(bands, a, 10, fs=65536)
x = x / 30
Ring down after:
PDT: 2016-08-23 11:07:02.661145 PDT
UTC: 2016-08-23 18:07:02.661145 UTC
GPS: 1156010839.661145
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