As the result of the control loop modification, the PR mirror motion is surely reduced. The attached figure shows the reconstructed PRX signal of yesterday (blue) and today (red).
As shown in the figure, red curve is lower than the blue curve.
- 0.4 Hz peak is larger now. Mmm...
- The difference above 6 Hz is due to the UGF difference.
- There is the coherence between length oplev signal. I would say the coherence above 1 Hz indicates the length oplev loop is shaking the mirror, not actually looking the motion itself.