|
Injection |
Time of first injection, UTC |
Injection spacing |
Total number of injections |
Good channels for environmental signal |
|
|
Sept. 5 |
|
|
|
|
crowd (10 people) walking randomly for 2 or 3s periods in control room |
1:39:00 |
5s |
12 |
HAM2 seismometer, vertex seismometer H1:PEM-CS_ACC_LVEAFLOOR_HAM1_Z
|
|
crowd (10 people) walking randomly in hall just outside control room |
1:41:00 |
5s |
12 |
same |
|
External door near control room shutting by itself |
1:44:00 |
5s |
12 |
same |
|
chair rolling in control room (most common chair) |
1:46:00 |
5s |
12 |
same |
|
Single large steps in control room |
1:50:00 |
5s |
12 |
same |
|
Airlock door (door to lab area near control room) shut by hand |
1:52:00 |
5s |
12 |
same |
|
slamming office door (Sheila, Kiwamu, Me) |
1:54:00 |
5s |
12 |
same |
|
hammer dropped from waist height in vacuum lab |
1:59:00 |
5s |
12 |
same |
|
setting car battery down in OSB shipping area |
2:02:00 |
5s |
12 |
same |
|
continuous bouncing for 5s on exercise/seating ball |
2:07:00 |
10s |
6 |
same |
I've attached the result. Quick observation from the spectrograms tell me that dropping hammer from waist height in vacuum lab (aka Kyle's lab) and setting car battery down in OSB shipping area coupled into DARM.
Instead of plotting the spectogram starting at the time of injection, this time I did +/- 10 seconds instead so it's more clear when the injection started and when it's ended.
Since I have never really explained what I did in finding noises in the sensors and in DARM, I'm taking some time to explain it in this alog. First I looked for injections in appropreiate sensors (accelerometer, microphone, seismometer). I zoomed in the spectrograms until I get the signal to show up >3 pixels or so in both frequency and time domain (as Robert suggested). Once I was certain that the injections were there, I went to look for them in DARM. I started with the same frequency range that the injections showed up in the sensors I used, if I couldn't find anything then I move up/down in frequency domain to look for any possible up/down conversions with increments depending on how wide the injections were in terms of frequency. Until I reached the lowest/highest frequency that the injections could possibly showed up, if I still didn't see anything only then I would conclude that the injections didn't show up in DARM.
More investigations on how some of these injections coupled into DARM will take days, weeks, I don't know. The point of these injections was to determine what activities can and cannot be performed during Observing run. This is why I posted spectrograms first and not wait until I'm done with the analyses. I simply let DARM spectrogram speaks for itself.
I have also attached better spectrograms of the super ball injection, produced using Dan's script.