1st injection
200 count injection
05:46:52 - 06:20:26 (JST)
50 - 900 Hz with 5 Hz resolution
10 second acoustic injection in one frequency
2nd injection
150 count injection
06:21:31 - 06:52:00 (JST)
50 - 900 Hz with 5 Hz resolution
10 second acoustic injection in one frequency
Some side band like signal detected in many frequency, so I will perform more high resolution injection test.
200 count injection
07:17:08 - 07:37:26 (JST)
200 - 300 Hz with 1 Hz resolution
10 second acoustic injection in one frequency
Some frequency have harmonics, some frequency have large linear response, some frequency not have linear response.
Some frequency have large sideband signal.
Peaks around 220 Hz would come from the sound around REFL area.
200 count injection
07:40:00 - 08:00:20 (JST)
100 - 200 Hz with 1 Hz resolution
10 second acoustic injection in one frequency
Similar with pre O3GK measurement, many non linearity signal detected when 117-118 Hz injection.
After finishing this measurement I set LSC_LOCK guardian to OBSERVATION state
I analyzed the "1st injection" data, 900Hz ~ 50Hz swept sine injection.
- Fig. 1: Spectrograms of the DARM and MIC
- Fig. 2~4: Checking the definition for each time window
- Fig. 5: Summary of all projections for each line injection
- PDF 1: Detail of each line injection
- Fig. 6: Summation of the projected noise
- PDF 2: Detail of the projected noise
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I also performed the same analysis for
4th injection
200 count injection
07:40:00 - 08:00:20 (JST)
100 - 200 Hz with 1 Hz resolution
10 second acoustic injection in one frequency
In the result, some overestimation is found. The injection amplitude might be too large.
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