40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
40m Log |
Not logged in |
 |
|
Fri Aug 12 19:13:25 2016, Praful, Update, Electronics, Mic Self Noise 8x
|
Fri Aug 12 21:26:28 2016, rana, Update, PEM, Mic Self Noise
|
Mon Aug 15 12:23:56 2016, Praful, Update, PEM, Mic Self Noise 9x
|
|
Message ID: 12405
Entry time: Fri Aug 12 19:13:25 2016
Reply to this: 12406
|
Author: |
Praful |
Type: |
Update |
Category: |
Electronics |
Subject: |
Mic Self Noise |
|
|
I used the Wiener filtering method described by Ignacio and Jessica (https://dcc.ligo.org/DocDB/0119/T1500195/002/SURF_Final.pdf and https://dcc.ligo.org/public/0119/T1500194/001/Final_Report.pdf) and got the following results:
mic1_wiener.pdf

mic2_wiener.pdf

mic3_wiener.pdf

The channel readout has a gain of 0.0005 and the ADC is 16-bit and operates are 20V. The channel also reads the data out in Pa. I therefore had to multiply the timeseries by 1/0.0005=2000 to get it in units of counts and then by (20 Volts)/(2^16 counts) to get back to the original signal in volts. The PSDs were generated after doing this calibration. I also squared, integrated, and square rooted the PSDs to get an RMS voltage for each microphone as a sanity check:
Mic 1: 0.00036 V
Mic 2: 0.00023 V
Mic 3: 0.00028 V
These values seem reasonable given that the timeseries look like this:
timeseries_elog.pdf

|
|
|
|
|
|
|
|
|