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Message ID: 86
Entry time: Fri Nov 9 00:01:24 2007
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| Author: |
waldman |
| Type: |
Omnistructure |
| Category: |
OMC |
| Subject: |
OMC mechanical resonances (Tap tap tappy tap) |
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[Pinkesh, Aidan, Sam]
We did a tap-tap-tappy-tap test of the OMC to try to find its resonances. We looked at some combination of the PDH error signal and the DCPD signal in a couple of different noise configurations. The data included below shows tapping of the major tombstone objects as well the breadboard. I don't see any strong evidence of resonances below the very sharp resonance at 1300 Hz (which I interpret as the diving board mode of the breadboard). If I get free, I 'll post some plots of the different breadboard resonances you can excite by tapping in different places.
(The "normalized" tapping response is abs(tap - reference)./reference.) |
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