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Entry  Mon Mar 4 16:46:31 2013, yuta, Update, SUS, oplev calibration for PRM PRM_PIT.pngPRM_YAW.png
    Reply  Tue Mar 5 17:09:30 2013, yuta, Update, SUS, oplev calibration for ITMY ITMY_PIT.pngITMY_YAW.png
       Reply  Tue Apr 2 15:58:40 2013, Jenne, Update, SUS, oplev calibration for ITMX, BS opl_itmx.pngopl_bs.png
          Reply  Tue Apr 2 16:13:10 2013, rana, Update, SUS, oplev calibration for ITMX, BS 
             Reply  Tue Apr 2 16:55:34 2013, Jenne, Update, SUS, oplev calibration online for ITMs, BS, PRM comparison_opl.pdf
                Reply  Tue Apr 2 18:19:30 2013, Jenne, Update, SUS, BS, PRM oplev servos improved PRM_servo_matches_BS.pdfprm_bs_optical_levers_comparison.pdf
                Reply  Tue Apr 30 22:40:57 2013, Jenne, Update, SUS, oplev XY-plots reflect new calibration 
                   Reply  Sun Sep 22 22:05:10 2013, rana, Update, SUS, oplev XY-plots reflect new calibration noise.png
                      Reply  Thu Oct 3 01:06:48 2013, rana, jenne, Update, SUS, oplev XY-plots reflect new calibration etmx_ol.png
                         Reply  Thu Oct 3 09:49:49 2013, Steve, Update, SUS, ETMY oplev laser is sick 
                      Reply  Tue Nov 5 19:55:12 2013, rana, Update, SUS, oplev XY-plots reflect new calibration 
Message ID: 8232     Entry time: Tue Mar 5 17:09:30 2013     In reply to: 8221     Reply to this: 8389
Author: yuta 
Type: Update 
Category: SUS 
Subject: oplev calibration for ITMY 

[Manasa, Sendhil, Yuta]

We calibrated oplev for ITMY. Calibration factor for C1:SUS-ITMY_OL(PIT|YAW)_IN1 are;
  OLPIT: 6.29 +/- 0.11 counts/mrad
  OLYAW: 5.74 +/- 0.09 counts/mrad

Note that there was ~10% of coupling between pitch and yaw. This is large considering statistical error, but I think this is from QPD mounted rotated (by ~5 deg).

Method:
  Same as in elog #8221.

Result:
 
moved in y: ITMY_PIT.png      moved in x: ITMY_YAW.png

micrometer    OLPIT          OLYAW
moved in y    3.14 +/- 0.05  0.27 +/- 0.03
moved in x   -2.87 +/- 0.04  0.17 +/- 0.03    (counts/mm)

  Measured the path length of ITMY oplev returning beam was 2000 +/- 20 mm. This gives you the calibration factors above.

  ~10 % coupling between OLPIT and OLYAW can be explained by QPD rotation by ~ 5 deg, which seems not unreasonable.

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