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Entry  Fri Aug 21 18:37:16 2009, Jenne, Update, General, Transfer function of Mode Cleaner Stacks TF_osems_guralps.png
    Reply  Tue Aug 25 00:35:04 2009, rana, Update, General, Transfer function of Mode Cleaner Stacks Untitled.png
Message ID: 1935     Entry time: Fri Aug 21 18:37:16 2009     Reply to this: 1938
Author: Jenne 
Type: Update 
Category: General 
Subject: Transfer function of Mode Cleaner Stacks 

Using free-swinging Mode Cleaner OSEM data and Guralp seismometers, I have taken transfer functions of the Mode Cleaner stacks.

During this experiment, the MC was unlocked overnight, and one Guralp seismometer was underneath each chamber (MC1/MC3, and MC2).  Clara will let me know what the orientation of the seismometers were (including which seismometer was underneath which chamber and what direction the seismometer axes were pointing), but for now I have included TFs for every combination of suspension motion and seismometer channels.

I combined the 4 OSEM channels for each optic in POS and PIT, and then calibrated each of my sus channels using the method described in Kakeru's elog entry 1413. Units are meters for POS, and radians for PIT.  I also calibrated the guralp channels into meters.

The traces on each plot are: MC_{POS or PIT} / Guralp_{1 or 2}_{direction}.  So each plot shows the coupling between every seismometer direction and a single mirror direction.  The colors are the same for all the plots, ie the gold trace is always Gur1Z.

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