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MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIKALBERT-EINSTEIN-INSTITUT
2002-02-21 Karsten Kötter 1
DC Data Analysis SEI/SUS (Suspensions &
Seismic Isolation)
DC Workshop, Golm2002-02-21
Karsten Kötter
2002-02-21 Karsten Kötter 2
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
power spectra / psd
•checked Matlab psd/pwelch algorithm to get power spectral densities / spectra right
2002-02-21 Karsten Kötter 3
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
psd / pwelch
•Matlab psd function• scaling not clear
•Matlab pwelch function• calculates correctly power spectral
densities
• conversion to power/amplitude spectra not possible• conversion factor ENBW ("Equivalent Noise
BandWidth") is not given
Hz
Unitrms2
2002-02-21 Karsten Kötter 4
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
Spectral density - pwelch
2002-02-21 Karsten Kötter 5
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
asd script
•wrote Matlab script to calculate• asd (amplituide spectral density)• ENBW
•allows you to calculate asd, psd, as, ps
2002-02-21 Karsten Kötter 6
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
Spectral density - asd
2002-02-21 Karsten Kötter 7
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
Spectrum - asd
2002-02-21 Karsten Kötter 8
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
Comparison ACC/SEIS sensors
•compared ACC sensor signals to SEI sensor signal• consistency check for calibration
functions
2002-02-21 Karsten Kötter 9
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
-6.0
-5.5
-5.0
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0 .0
0 .5
1 .0
1 .5
2 .0
5 98 .0 5 98 .5 5 99 .0 5 99 .5
-2.0
-1.5
-1.0
-0.5
0 .0
0 .5
1 .0
1 .5
2 .0
-47 .0 -46 .5 -46 .0 -45 .5 -45 .0 -44 .5 -44 .0 -43 .5 -43 .0 -42 .5 -42 .0 -41 .5 -41 .0
5 96 .5
5 97 .0
5 97 .5
TCC
TCE TFETCIb
TCMb TCMa
TCIa
TCN
TFN
TCOa
TCOb Detect ion Bench
M o d e C le a n e r 1
M o d e C le a n e r 2
Bea
m T
ele
sco
pe
In b o a rd M irro r Ea st
In b o a rd M irro r N o rth
Fa r M irro r Ea st
Fa r M irro r N o rth
M U 2
M U 3
B DI M C1
B D A IB
B D A O 1 a
B D A O 1 b
M M C1 a
M M C1 c
B DO M C 1
B D M M C 1 a
B D M M C 1 b
B D M M C 1 c
FI M C2 b
FI M C2 a
P CM C2
B DI M C2
M M C2 a
M M C2 c
B D M M C 2 B D P M C 2
B D A M C 2 a
B D A M C 2 b
M M C1 bB D A M C 1 a
M M C2 bB DO M C 2
B D O P R
FI P Ra
L P R
FI P Rb
P CP R
B DI P R
M P R
B D B S n b
B S
B D B S e a
B D B S e b
B D B S w
B D B S s
M C e M F eB D B S n a
M C n
M F n
M S R
B DO 1
B DO 2
B DO 3
O M C
P DO
P DM C3
P DA I B
P DA M C 1
P DA M C 2
P DA O 1
P DA P R P DB S n
P DB S s
P DB S w
P DB S e
P DI M C2
P DI P R
P DM C1
P DM C2
P DP R
P DR PR
wa ist in tang ential p lane , p rop agat ion to the left
wa ist in sagitta l plan e, pro paga tio n to the righ t(wa ist in d icator for tan gential p lane not sho wn )
SEI_TFE_ SEIS-XSEI_TFE_ SEIS-Y
SEI_TFN_ SEIS-XSEI_TFN_ SEIS-Y
SEI_TC Ib _SEIS-XSEI_TC Ib _SEIS-Y
SEI_TC C _SEIS-XSEI_TC C _SEIS-Y
SEI_TFN_ AC C -X-ST3SEI_TFN_ AC C -Y-ST3SEI_TFN_ AC C -Z-ST3
SEI_TFE_ AC C -X-ST2SEI_TFE_ AC C -Y-ST2SEI_TFE_ AC C -Z-ST2
xy
SEI_TC Ib _AC C -X-ST3SEI_TC Ib _AC C -Y-ST3SEI_TC Ib _AC C -Z-ST3
2002-02-21 Karsten Kötter 10
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
Comparison ACC/SEIS sensors
2002-02-21 Karsten Kötter 11
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
Coherence seismic - MI output
•calculated coherence function between LSC_MID_EP-P and seismic channels• check whether sensitivity is limited by
seismic motion in some frequency bands
2002-02-21 Karsten Kötter 12
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
Coherence seismic - MI output
2002-02-21 Karsten Kötter 13
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
SEI_TFN_ACC-Y-ST3
2002-02-21 Karsten Kötter 14
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
coherence plots - results
•output dominated by noise from TFN at 8-10 Hz• mechanical resonance in suspension
(horizontal mode of stack rubber layer)
2002-02-21 Karsten Kötter 15
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
coherence plots - results
g e o p ho n z
g e o p ho n x
g e o p ho n y
PZT
rub b e r la ye r
fla ng e
b e llo w
x
yz
2002-02-21 Karsten Kötter 16
MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT
evolution of signals over c.run