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VIS (BS)
terrence.tsang - 1:22 Sunday 17 March 2019 (8430) Print this report
BS tilt sensing OPLEV calibration

see bstiltqpdcal20190316.png for the calibration curve for the BS tilt QPD. 

The calibration factors are 0.004063 mm/counts for horizontal and 0.004534 mm/counts for vertical.

Using the length parameters from 8417 and assuming an incident angle of 36.9 º (same as the SRs), the "linear" range for pitch is ±177.6 µrad and ±200.1 µrad for yaw.

For now, the OL2EUL matrix is 

OL2EUL for tilt only
  TILT_PIT TILT_YAW LEN_PIT LEN_YAW
L 0 0 0 0
P 1.76971116 0 0 0
Y 0 1.98311972  0 0
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