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Entry  Thu May 16 04:46:37 2013, Jenne, Update, LSC, Kiwamu's sensing matrix measurement script revived 
    Reply  Thu May 16 23:48:39 2013, Jenne, Update, LSC, Kiwamu's sensing matrix measurement script revived 
       Reply  Mon May 20 17:49:36 2013, Jenne, Update, LSC, PRMI sensing matrix - not high quality data PRMIsensMatQuickAnalysis.m.gz
          Reply  Mon May 20 18:47:47 2013, Koji, Update, LSC, PRMI sensing matrix - not high quality data 
             Reply  Tue May 21 14:48:08 2013, Jenne, Update, LSC, PRMI sensing matrix - not high quality data 
       Reply  Mon May 20 18:50:22 2013, Jenne, Update, LSC, Kiwamu's sensing matrix measurement script revived 
          Reply  Tue May 21 18:22:18 2013, Jenne, Update, LSC, Sensing matrix scripts modified to include actuator calibration 
             Reply  Wed May 22 00:08:19 2013, Koji, Update, LSC, Sensing matrix scripts modified to include actuator calibration 
                Reply  Wed May 22 18:24:19 2013, Jenne, Update, SUS, Violin mode survey 
                Reply  Wed May 22 20:50:26 2013, Jenne, Update, LSC, Sensing matrix scripts don't calculate correctly 
                   Reply  Thu May 23 14:45:08 2013, Jenne, Update, LSC, Sensing matrix scripts calculations make more sense now SensMat_JenneMeas_23May2013.pngSensMat_KojiMeas_23May2013.png
                      Reply  Thu May 23 21:45:51 2013, Jenne, Update, LSC, Sensing matrix scripts now check for lockloss 
                Reply  Thu May 23 19:09:15 2013, Jenne, Update, LSC, Sensing matrix scripts modified to include actuator calibration SensMat_21May2013.png
          Reply  Wed May 22 18:07:36 2013, Jenne, Update, LSC, Kiwamu's sensing matrix measurement script revived 
             Reply  Thu May 23 00:49:13 2013, Jenne, Update, LSC, LSC filters loaded 
Message ID: 8600     Entry time: Mon May 20 17:49:36 2013     In reply to: 8593     Reply to this: 8601
Author: Jenne 
Type: Update 
Category: LSC 
Subject: PRMI sensing matrix - not high quality data 

Just so we have some numbers, I did a by-hand analysis of the PRMI sensing matrix numbers I posted here in the elog the other day.  This analysis is ignoring the error bar data.

For each sensor (PD_I or PD_Q), I do loop compensation, since these measurements were taken fairly close to the UGFs of the loops, and notches were not in use at the drive frequency.  To do the loop compensation, I multiply the complex value (lockin_I + i*lockin_Q) by (1-G), where G is the (complex) open loop gain of the degree of freedom I'm shaking.

 When I'm shaking a single degree of freedom (ex. shaking the PRM to get PRCL information), for each PD_I or PD_Q, we get 2 numbers, the lockin_I and lockin_Q values.    I check the phase between the lockin_I and lockin_Q values, since that phase (after loop compensation) should be either 0 or 180, and if it is not, something is wrong. 

Of the 16 sensors I measure (where PD_I and PD_Q count as 2 sensors), 11 sensors had phases more than 20 degrees away from either 0 or 180.  This is not good, and indicates that something is wrong with my measurement.  I suspect that I may not be driving hard enough -  I was using an amplitude 4x smaller than the previous value.  Next time the PRMI is locked, I will turn on the drive oscillation, and ensure that I can see the line in all of the PD signals.

The results of my quickie analysis script:

Bad REFL11_I_MICH phase!  Phase is -82.0185 degrees!
Bad REFL11_Q_MICH phase!  Phase is -35.9697 degrees!
Bad REFL33_I_MICH phase!  Phase is -134.952 degrees!
Bad REFL55_I_MICH phase!  Phase is -79.7997 degrees!
Bad AS55_I_PRCL phase!  Phase is -142.6016 degrees!
Bad AS55_Q_PRCL phase!  Phase is 90.6194 degrees!
Bad REFL11_I_PRCL phase!  Phase is 52.471 degrees!
Bad REFL11_Q_PRCL phase!  Phase is 52.2324 degrees!
Bad REFL33_I_PRCL phase!  Phase is 52.909 degrees!
Bad REFL33_Q_PRCL phase!  Phase is 25.14 degrees!
Bad REFL55_I_PRCL phase!  Phase is 52.8113 degrees!

Sensing Matrix, calculated even though most of the measurement data isn't any good:
AS55: MICH = 0.13502, -1.6122deg.  PRCL = 0.14993, -2.245deg
REFL11: MICH = 29.6373, -2.6365deg.  PRCL = 7376.3206, -2.9098deg
REFL33: MICH = 0.35649, -2.9633deg.  PRCL = 69.5133, -3.1302deg
REFL55: MICH = 0.62084, -2.0261deg.  PRCL = 75.0214, 3.1176deg

Attachment 1: PRMIsensMatQuickAnalysis.m.gz  1 kB
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