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Entry  Tue Jan 10 00:09:33 2012, kiwamu, Update, LSC, spike hunting in REFL33 
    Reply  Tue Jan 17 01:02:07 2012, kiwamu, Update, LSC, glitch hunting in REFL RFPDs : strange PRMsingle_bounce.png
       Reply  Tue Jan 17 02:27:49 2012, kiwamu, Update, LSC, fringe tests : all the suspensions are innocent 
       Reply  Tue Jan 17 13:47:40 2012, kiwamu, Update, LSC, dirty steering mirror in the REFL path 
          Reply  Wed Jan 18 12:36:26 2012, kiwamu, Update, LSC, wiped a steering mirror on the REFL path DSC_3861_small.jpgDSC_3863_small.jpg
       Reply  Tue Jan 17 19:07:47 2012, rana, Update, LSC, glitch hunting in REFL RFPDs : strange 
       Reply  Wed Jan 18 14:28:36 2012, kiwamu, Update, LSC, estimation of optical length between PRM and scattering object calibration.pngscattering.png
          Reply  Wed Jan 18 16:31:10 2012, kiwamu, Update, LSC, estimation of optical length between PRM and scattering object ND1atten.png
Message ID: 6203     Entry time: Tue Jan 17 02:27:49 2012     In reply to: 6202
Author: kiwamu 
Type: Update 
Category: LSC 
Subject: fringe tests : all the suspensions are innocent 

I did a quick test to check a hypothesis that PRM is interfering with some other optics in the single bounce configuration.

I shook all the suspensions (except the MC mirrors) at 3 Hz in POS, PIT and YAW with an amplitude of 1000 counts.

No effects were found in the REFL demod signals.

So it is NOT a fringe effect caused by the other suspended mirrors.

Quote from #6202

The REFL11 and REFL55 demod signals show high frequency noise depending on how big signals go to the POS actuator of PRM.

Is PRM making some fringes with some other optics ??   

 

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