cheryl.vorvick@LIGO.ORG - posted 10:58, Tuesday 18 February 2020 - last comment - 11:26, Tuesday 18 February 2020(55155)
ETMY violin modes, 1000Hz to 1000.5Hz, current state of filters: 2 of 4 filters have been updated
ETMY modes 11, 12, 18, and 20. Modes 18 and 20 have had their filters updated to be more narrow and thus separate the damping of one peak from another.
| mode 20 damping filter at mode 20 frequency (1000.307Hz) | 120 dB |
| mode 11 damping filter at mode 20 frequency (1000.307Hz) | 65 dB |
| mode 12 damping filter at mode 20 frequency (1000.307Hz) | 91 dB |
| mode 18 damping filter at mode 20 frequency (1000.307Hz) | 52 dB |
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Possible updates to mode 11 and 12 filters:
- mode 11 - current: butter("BandPass",4,1000.011,1000.111)gain(120,"dB")
- mode 11 - possible new filter: butter("BandPass",6,1000.056,1000.066)gain(120,"dB")
- mode 12 - current: butter("BandPass",4,1000.373,1000.473)gain(120,"dB")
- mode 12 - possible new filter: butter("BandPass",6,1000.418,1000.428)gain(120,"dB")
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