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| * ''' Gain of whitening filter = 30 dB ''' for both the I and Q. * ''' Demodulation phase = 17.6 deg ''' (at which the I signal doesn't respond to the Michelson displacement). |
* ''' Gain of whitening filter = 30 dB ''' * ''' Demodulation phase = 17.6 deg ''' |
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| * ''' Gain of whitening filter = 42 dB ''' for both the I and Q. | * ''' Gain of whitening filter = 42 dB ''' |
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<<BR>> * ''' LO = 11065910 Hz ''' by a Marconi |
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| || AS55 || 0.02 mW || || REFL || 644 mW || |
|| AS (before the attenuation)|| 0.02 mW || || AS55 || ? mW || || REFL (before the attenuation)|| 644 mW || || REFL11 || ? mW || || REFL33 || ? mW || || REFL55 || ? mW || || REFL165 || ? mW || |
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| {{attachment:oltf_prmi.png }} | |
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| * There is a big RAM signal in the I signal. The signals float from -100 counts to 0 counts as the Michelson freely swings. * The amount of the RAM looks changing as a function of time. * The Q signal looks having not so much RAM effect. |
* Is something going on ? |
PRMI Noise budget
Measurements
- 7/Mar/2012 by KI
Sensor in use
- AS55_Q for MIHC
Gain of whitening filter = 30 dB
Demodulation phase = 17.6 deg
- REFL33_I for PRCL
Gain of whitening filter = 42 dB
Demodulation phase = -38.050 deg
LO = 11065910 Hz by a Marconi
DC light
port name
DC power [mW]
AS (before the attenuation)
0.02 mW
AS55
? mW
REFL (before the attenuation)
644 mW
REFL11
? mW
REFL33
? mW
REFL55
? mW
REFL165
? mW
Sidebands
- The values noted here were estimated from the OSAs at the AS and REFL ports.
Optical gains
Parameters
description
values
notes
Estimated Optical gain
80 uW/m
Measured pk-pk Michelson error signal
1000 counts
Michelson was freely swinging
Raw optical gain
5.9052 x10^9 [counts/meter]
= 4 * pi / lambda * (pk value of the error signal)
Conversion loss of mixer
6.5 dB
from the spec sheet of JMS-1H
ADC conversion
1638.4 counts / V
16 bit, +/-20 V
Trans impedance at 55 MHz
556.3 Ohm
Responsibity of diodes
0.8 [A/W]
from the spec sheet of CS3102
Attenuation in the AS path
Servo filters
- UGF = 55 Hz
- Only FM5 (10:1000) was activated.
- G = -2
- No limiter in the digital path.
- Feeding the signal back to BS.
- Dewhitening filters in BS are ON.
- Assumption : BS actuator has a pole at 1 Hz with Q = 5
- Time delay = (without considering the effects from the analog circuits and the down sampleing filters.)
RAM effects
- Is something going on ?