40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Thu May 23 20:39:50 2013, Jenne, Update, LSC, PRMI sensing matrix measured at 580.1Hz SensMat_23May2013.png
    Reply  Thu May 23 22:13:12 2013, Koji, Update, LSC, PRMI sensing matrix measured at 580.1Hz 
       Reply  Fri May 24 13:41:19 2013, Jenne, Update, LSC, PRMI sensing matrix measured at 580.1Hz SensMat_23May2013_withIQ.png
          Reply  Fri May 24 14:01:59 2013, Koji, Update, LSC, PRMI sensing matrix measured at 580.1Hz 
             Reply  Fri May 24 14:40:22 2013, Jenne, Update, LSC, PRMI sensing matrix: now what? 
                Reply  Fri May 24 22:18:33 2013, Jenne, Update, LSC, PRMI sensing matrix: Got it! SensMat_23May2013_withIQ_andCorrectPhases.png
                   Reply  Tue May 28 14:52:56 2013, Jenne, Update, LSC, PRMI sensing matrix: Got it! SensMat_21May2013_withIQ_andCorrectPhases.png
                      Reply  Tue May 28 17:06:04 2013, Koji, Update, LSC, PRMI sensing matrix: Got it! 
Message ID: 8644     Entry time: Fri May 24 22:18:33 2013     In reply to: 8642     Reply to this: 8648
Author: Jenne 
Type: Update 
Category: LSC 
Subject: PRMI sensing matrix: Got it! 

Okay, I think I am finished with the sensing matrix scripts!  

I had the syntax for atan2() wrong, so I was calculating the demod phase wrong.  Do not trust the phase in any previous elogs!!

Also, the theta=0 axis of the plots are for 0 degree demod phase, but our PDs are not at 0 deg.  The measured sensing matrix phase is relative to the current demod phase, not 0 (unless the demod phase for that PD is currently 0degrees).  So, now I take that into account.  I add the current PD demod phase to the measured sensing matrix phase, so that the plot is actually true.

For interested parties, I have made all of the sensing matrix scripts, and the data folder a subdirectory of the /scripts/LSC folder, since it was starting to get crowded in there.  I have moved the 2 data sets that have been collected (21May, 23May) into the new place.

Future thoughts: 

* Save the amplitude and modulation frequency and the current demod phases in the data file.  Right now the ampl and mod freqs are included in the title of the data file, but there is no record of what the demod phase was at the time.  I need to fix this.

 

So, really, really, the Sensing Matrix:

Sensing Matrix, units = counts/meter, phase in degrees
 
            PRCL Mag   PRCL Phase    MICH Mag   MICH Phase  
AS55         5.485E+08   -43.424      2.679E+09    93.392    
REFL11       1.126E+13    -7.168      1.618E+11   135.296    
REFL33       2.658E+11   164.973      8.910E+09    -2.226    
REFL55       3.012E+11   -75.216      1.210E+10   172.764

SensMat_23May2013_withIQ_andCorrectPhases.png

ELOG V3.1.3-