Virgo Logbook

Environmental Monitoring (Environmental Monitoring)

Paoletti, Fiori, Tringali, Passaquieti - 15:07 Tuesday 02 August 2022 (56612)

Setup of a seismic shaker onto the NEB HALL floor

Today we have prepared (and tested) a seismic shaker placed on the NE hall floor.
It will be used to validate software that should recognize the origin of a noise read from the NN array.

Attached photo: the shaker has been placed in front of the electronic racks (the first in the row, North side)

All is ON but the signal (1 V @ 28 Hz) is not sent to the amplifier (matrix set at 0)

Images attached to this report

Comments to this report:

fiori - 12:19 Thursday 04 August 2022 (56642)

Today, between 7:50 UTC and 9:59 UTC we have generated a seismic line at 28 Hz with the shaker on NEB floor. As shown in the attached figures, the generated line has similar intensity as the line at 29Hz generated by the remote dry pump, both inthe guralp sensor (Figure 1) and in the NN array (Figure 2). We deemed it not harmful at all for the ITF operation so we proceeded with this injection.

Images attached to this comment

fiori - 16:34 Wednesday 24 August 2022 (56826)

Today we have performed the following injections with the shaker (same location on NEB floor):

from 10:46 to 11:02 UTC - linear sweep from 10Hz to 100Hz (ACL_SWEEPLINE_CH amplitude 0,5 V)
from 11:05 to 11:15 UTC - sinewave line at 41 Hz (ACL_SINEWAVE_CH amplitude 0.5 V)
from 11:32 to 11:40 UTC - colored noise between 30 and 70 Hz (but actually the injected noise in some NN sensors is well visible up to almost 200Hz) (ACL_NOISE_CH amplitude 0.1 V)

The last attached plot refers to the sinewave at 28Hz generated on August 4 (see above).

Images attached to this comment

fiori, paoletti - 9:45 Thursday 08 September 2022 (56969)

This Tuesday, september 6 between 9:40 to 13:10 UTC, we performed an injection with a set of lines. The frequency (Hz) of the line is reported in the 7th column of the table below.

ACL_SINEWAVE_CH               noise_line11           "V"   0   SAMP_FREQ   0.1     12    0       0
ACL_SINEWAVE_CH               noise_line21           "V"   0   SAMP_FREQ   0.1     15    0       0
ACL_SINEWAVE_CH               noise_line31           "V"   0   SAMP_FREQ   0.1     19.1    0       0
ACL_SINEWAVE_CH               noise_line41           "V"   0   SAMP_FREQ   0.3     23.15 0       0
ACL_SINEWAVE_CH               noise_line51           "V"   0   SAMP_FREQ   0.2     27.22    0       0
ACL_SINEWAVE_CH               noise_line61           "V"   0   SAMP_FREQ   0.35     31.3    0       0
ACL_SINEWAVE_CH               noise_line71           "V"   0   SAMP_FREQ   0.1     36.47    0       0
ACL_SINEWAVE_CH               noise_line81           "V"   0   SAMP_FREQ   0.05     42.31    0       0
ACL_SINEWAVE_CH               noise_line91           "V"   0   SAMP_FREQ   0.2     49.13 0       0
ACL_SINEWAVE_CH               noise_line101           "V"   0   SAMP_FREQ   0.2     57.666 0       0