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VIS (PRM)
fabian.arellano - 15:43 Thursday 13 January 2022 (19431) Print this report
SF LVDT calibration.

With Hirata-san.

Summary: We calibrated the SF LVDT.

First we tested the polarity of the LVDT: moving the keystone up by hand produces a positive LVDT output. This means that the calibration factor in the medm screen should be positive. In the plot attached the slope is negative because the reference point used was above the keystone.

  • Slope of the straight line: -4168.1 cnt/mm
  • Calibration factor for the medm screen: (1000 / 4168.1) um/cnt = 0.240 um/cnt.

The data is in /kagra/Dropbox/Subsystems/VIS/TypeBpData/PRM/SF_calibration/

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Comments to this report:
takafumi.ushiba - 11:25 Wednesday 26 January 2022 (19573) Print this report

I updated the calibration factors of  PRM SF GAS filter (fig1).
I also increase the gain of control filter by 12 dB to keep the UGF of SF GAS control.

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