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R&D (FilterCavity)
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EleonoraCapocasa - 12:08, Monday 25 November 2019 (1877)Get code to link to this report
Rough actuators calibration for cavity mirrors

I tried to compute a rough calibration for the cavity mirrors actuation in DC.

I injected an offest of 10.000 counts in pitch and yaw, in INPUT and END mirrors, one at a time, and record the change seen by OPLEV.

Then I used the calibration reported in entry #1874 to convert it in urad:

10.000 counts injected 

INPUT

END

PITCH

63 urad

52   urad

YAW 220 urad 268    urad

Pitch is stiffer than yaw. There is a difference of 15/20% beetween INPUT and END that can come from both errors in OPLEV calibration and actuation unbalance. Also It is a bit strange to me that for the same amout of injected counts pitch motion is larger for INPUT and yaw motion is larger for END.