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  40m Log, Page 21 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  6551   Thu Apr 19 22:18:24 2012 DenUpdateAdaptive Filteringoaf algorithm: old vs new Here are the issues that I found
not quite accurate in the old oaf code:
1. There is no need to calculate
  
  6553   Fri Apr 20 23:02:25 2012 DenUpdateAdaptive Filteringfrequency domain filter DFT-LMS is a frequency domain adaptive
filter that demonstrates faster convergence
compared to the time-domain LMS filter.
 dft.pngnorm.png 
  6642   Fri May 11 23:33:41 2012 DenUpdateAdaptive Filteringoffline vs onlineI've compared offline Wiener filtering
with online static + adaptive filtering for
MC_F with GUR1_XYZ and GUR2_XYZ as witness
 off_on.jpg 
  7000   Sat Jul 21 18:04:02 2012 DenUpdateAdaptive Filteringfrequency domain filterI've implemented online frequency domain
filter and applied it to MC_F.
 freq_af.png 
  7234   Mon Aug 20 13:02:57 2012 DenUpdateAdaptive Filtering1 Hz resonanceStatic filter was adjusted to filter 1
Hz resonance in MCL and it could do it. Stack
is not great in this experiment due to the
 1hz.png 
  7252   Wed Aug 22 20:33:51 2012 DenUpdateAdaptive FilteringMC_L in ARMSJenne and I did adaptive filtering of MC_L
and measured how X and Y ARM control signals
change compared to non-filtered MC_L. We
 oaf_arms.png 
  7589   Mon Oct 22 20:44:49 2012 AyakaUpdateAdaptive Filteringmicrophone noiseI will do some experiments on acoustic
noise canceling during my stay.
Now I am planning to cancel acoustic
 mic_noise2.png 
  7592   Tue Oct 23 00:51:41 2012 JamieUpdateAdaptive Filteringmicrophone noise

    

       
            
  
  7596   Tue Oct 23 10:24:42 2012 AyakaUpdateAdaptive Filteringmicrophone noise

    

       
            
  
  7607   Wed Oct 24 14:15:34 2012 AyakaUpdateAdaptive Filteringmicrophone noisePrevious results
I am measuring the noise level of
the microphones. The circuit does not seems
 mic_open.pngmic_noise.png 
  7609   Wed Oct 24 15:29:52 2012 ranaUpdateAdaptive Filteringmicrophone noise  We have to change the sample
rate and AA filter for the mic channels before
going too far with the circuit design.
  
  7610   Wed Oct 24 17:02:01 2012 JenneUpdateAdaptive Filteringmicrophone noise

    

       
            
  
  7614   Wed Oct 24 22:20:24 2012 DenUpdateAdaptive Filteringmicrophone noise

    

       
            
 mic_64k.pdf 
  7621   Thu Oct 25 09:53:23 2012 AyakaUpdateAdaptive Filteringmicrophone noise

    

       
            
  
  7622   Thu Oct 25 10:03:38 2012 ranaUpdateAdaptive Filteringmicrophone noise  That's no good - we need BLRMS
channels for many PEM channels, not just
two. And the channel names should have the
  
  7623   Thu Oct 25 14:39:14 2012 DenUpdateAdaptive Filteringmicrophone noise

    

       
            
  
  7633   Fri Oct 26 18:25:02 2012 AyakaUpdateAdaptive FilteringMicrophone noise again[Raji, Ayaka]
Thanks to Den, power supplies for
microphone circuit are changed.
 mic_noise.png 
  7634   Fri Oct 26 19:06:14 2012 DenUpdateAdaptive FilteringMicrophone noise again

    

       
            
  
  7636   Mon Oct 29 08:41:22 2012 AyakaUpdateAdaptive FilteringMicrophone noise again

    

       
            
  
  7708   Tue Nov 13 21:05:35 2012 DenUpdateAdaptive Filteringonline and simulationFor a last few days I've been working on
oaf and simulink model to simulate it. First
I did online subtraction from MC when MC_L
 8x 
  7764   Fri Nov 30 02:40:44 2012 DenUpdateAdaptive FilteringYARMI've applied FIR adaptive filter to YARM
control. Feedback signal of the closed loop
was used as adaptive filter error signal
 yarm_oaf.png 
  7767   Fri Nov 30 11:49:24 2012 KojiUpdateAdaptive FilteringYARMThis is interesting. I suppose you are
acting on the ETMY.
Can you construct the compensation
  
  7769   Fri Nov 30 22:11:50 2012 DenUpdateAdaptive FilteringARMS

    

       
            
 arms_oaf.pdf 
  7771   Sat Dec 1 00:13:16 2012 DenUpdateAdaptive FilteringARMS and MC

    

       
            
 arms_mcl_oaf.pdf 
  7591   Tue Oct 23 00:41:55 2012 JenneUpdateAlignmentMC locked, spots centered[Jenne, Raji]
We replaced the MC Refl path BS with
the Y1, as usual, so that the full ~100mW
 Screenshot-Figure_1.png 
  7599   Tue Oct 23 17:30:33 2012 jamie, nic, jenne, raji, manasaUpdateAlignmentInitial attempts to fix IFO alignmentWe went into the vertex today to see about
fixing the alignment.  The in-air access
connector is in place, and we took heavy
  
  7600   Tue Oct 23 17:41:20 2012 ManasaUpdateAlignmentPower supply at OMC removed

    

       
            
  
  7601   Tue Oct 23 18:12:18 2012 JenneUpdateAlignmentTip tilt wires - the truth

    

       
            
  
  7603   Tue Oct 23 18:21:21 2012 JenneUpdateAlignmentPower supply at OMC removed

    

       
            
  
  7606   Wed Oct 24 11:49:07 2012 JenneUpdateAlignmentGame plan for the dayJamie has arranged for phase map measurements
this afternoon, so I will take the 6 dichroic
LaserOptik optics over to Downs at 1:15 this
  
  7608   Wed Oct 24 14:19:01 2012 JenneUpdateAlignmentPhase map summary of LaserOptik mirrors

    

       
            
  
  7624   Thu Oct 25 15:38:06 2012 RajiUpdateAlignmentTransmitance Measurements on LaserOptik mirrorI measured the transmitted power @1064nm
on one of the LaserOptik mirrors labled SN6
Here is the data
  
  7632   Fri Oct 26 16:57:30 2012 JenneUpdateAlignmentPR2 aligned, PR3 mostly aligned[Raji, Jenne]
After lunch we began where Raji and
Jamie had left things.  PR2 was unfortunately
  
  7635   Sat Oct 27 23:13:12 2012 ranaUpdateAlignmentalignment strategy Maybe we have already discarded this
idea, but why not 
  
  7641   Mon Oct 29 18:50:02 2012 JenneUpdateAlignmentPRC aligned, Yarm almost aligned[Jamie, Jenne, Raji, with consultation
from Nic, Ayaka and Manasa]
We went back and re-looked at the
  
  7642   Tue Oct 30 11:51:45 2012 JenneUpdateAlignmentPRC aligned, Yarm almost aligned[Raji, Jenne]
We tweaked PZT2, PZT1 (yaw only),
and PR3 (pitch only) to get the beam ~centered
  
  7643   Wed Oct 31 01:06:31 2012 DenUpdateAlignmentYarm 
 Jenne, Den
We looked at beam spots on ITMY and
  
  7644   Wed Oct 31 12:58:17 2012 RajiUpdateAlignmentTransmitance Measurements on LaserOptik mirror

    

       
            
 Transmission-plot@1064nm.pdfTransmission-data@1064nm.pdf 
  7646   Wed Oct 31 17:11:40 2012 jamieUpdateAlignmentprogress, then setbackjamie, nic, jenne, den, raji, manasa
We were doing pretty well with alignment,
until I apparently fucked things up.
  
  7647   Wed Oct 31 17:18:34 2012 JenneUpdateAlignmentprogress, then setback - trend of BS table shiftHere is a two hour set of second trends
of 2 sensors per mirror, for BS, PRM, ITMY
and MC1.  You can see about an hour
 PRM_BS_table_bumped_ITMY_MC1_no_big_change_2hoursBack.png 
  7648   Wed Oct 31 17:33:39 2012 KojiUpdateAlignmentTransmitance Measurements on LaserOptik mirror...Looks like the coating is out of spec
at any angle for 1064nm. E11200219-v2
  
  7649   Wed Oct 31 17:36:39 2012 jamieUpdateAlignmentprogress, then setback - trend of BS table shift

    

       
            
  
  7651   Thu Nov 1 01:51:37 2012 ranaUpdateAlignmentprogress, then setback - trend of BS table shift  But these jumps in the OSEMs
are all at the level of 10-20 microns. Seems
like that wouldn't be enough to account for
  
  7652   Thu Nov 1 08:48:42 2012 steveUpdateAlignmentprogress, then setback - trend of BS table shift

    

       
            
 alignmentstrugle2d.pngalignmentstrugle2da.pngbefpd09252012.png 
  7653   Thu Nov 1 10:13:53 2012 jamieUpdateAlignmentTransmitance Measurements on LaserOptik mirror

    

       
            
  
  7654   Thu Nov 1 10:19:11 2012 jamieUpdateAlignmentTransmitance Measurements on LaserOptik mirror

    

       
            
  
  7655   Thu Nov 1 10:58:49 2012 jamieUpdateAlignmentprogress, then setback - trend of BS table shiftHere's a plot of the BS, PRM, and MC1 suspension
shadow sensor trends over the last 24 hours. 
I tried to put everything on the same Y scale:
 foo.png 
  7657   Thu Nov 1 19:26:09 2012 jamieUpdateAlignmentaligned, this time without the cryingJamie, Jenne, Nic, Manasa, Raji, Ayaka,
Den
We basically walked through the entire
  
  7658   Thu Nov 1 19:28:48 2012 JenneUpdateAlignmentaligned, AS beam on cameraAfter everyone else did the hard work,
I moved the AS first-on-the-table steering
mirror sideways a bit so the AS beam is on
  
  7664   Fri Nov 2 19:59:54 2012 JenneUpdateAlignmentPOP, POX, POY, IPPOS, IPANG, REFL all coming out of vac[Evan, Jenne, Jamie]
We used the green laser pointer technique
to adjust the POP steering mirrors behind
  
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