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Message ID: 5842     Entry time: Tue Nov 8 18:06:43 2011
Author: Mirko 
Type: Update 
Category: Adaptive Filtering 
Subject: Noise injections to MC1-3 PIT & YAW 

With fancy analysis tools approaching usability I looked some more into noise projections from PIT,YAW motion of the MC mirrors to MC length.

Injection channels are: C1:IOO-MC1-PIT_EXC. Actual injection signal is recorded in C1:IOO-MC1-PIT_OUT and similar.
Source channels for the projection are C1:IOO-WFS1_I_PIT_OUT_DQ and similar.
Response channel is C1:OAF-MCL_IN_IN1 or C1:IOO-MC_F_DQ.
MC auto-alignment was off.

1. Fixed sine injection @ 0.5Hz

Every injection lasted 4mins.

Start time DOF Amplitude [counts_pk] rough SNR in ASD BW 0.04Hz
16:09 MC1PIT 25 -
16:14 MC1YAW 40 12
16:21 MC2PIT 35 5
16:26 MC2YAW 35 5
16:34 MC3PIT 45 5
16:39 MC3YAW 45 -

2. Filtered white noise injection

Generated white noise from 0.5Hz-20Hz, then filtered that in the C1:IOO-MC1-PIT and similar filters by the following TF, (Notch 1Hz, Q=3, 40dB &  2 zeros @ 1.1Hz)

INJ_filter.png

All injections lasted 4mins. I left the filters in the first filter bank but disabled them. 

Start time DOF Amp. @ 0.5Hz [counts_pk (?)]
17:01 MC1PIT 250
17:10 MC1YAW 400
17:16 MC2PIT 400
17:21 MC2YAW 400
17:26 MC3PIT 500
17:31 MC3YAW 500

 

Attachment 2: MC1PIT_Noise_inj.png  50 kB  | Hide | Hide all
MC1PIT_Noise_inj.png
Attachment 3: Noise_Inj_MC2PIT.png  48 kB  | Hide | Hide all
Noise_Inj_MC2PIT.png
Attachment 4: Noise_Inj_MC2YAW.png  48 kB  | Hide | Hide all
Noise_Inj_MC2YAW.png
Attachment 5: Noise_Inj_MC3PIT.png  49 kB  | Hide | Hide all
Noise_Inj_MC3PIT.png
Attachment 6: Inj_Noise_MC3YAW.png  49 kB  | Hide | Hide all
Inj_Noise_MC3YAW.png
Attachment 7: Inj_Noise_MC1YAW.png  50 kB  | Hide | Hide all
Inj_Noise_MC1YAW.png
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