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 Tue Jul 2 11:21:24 2013, Erica, DailyProgress, fiber optic, mode matching 
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 Wed Jul 3 09:46:48 2013, Erica, DailyProgress, fiber optic, mode matching
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Thu Jul 11 01:40:19 2013, Erica, DailyProgress, fiber optic, mode matching
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Fri Jul 12 00:51:39 2013, Erica, Notes, fiber optic, mode matching
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Tue Jul 16 10:27:47 2013, Erica, Notes, fiber optic, mode matching, beam recombination
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Tue Jul 16 11:02:47 2013, Erica, Notes, fiber optic, mode matching, beam recombination
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Wed Jul 17 11:58:47 2013, Erica, Notes, fiber optic, mode matching, beam recombination
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Wed Jul 17 18:29:37 2013, Erica, DailyProgress, fiber optic, reducing drift in the recombined beam
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Sat Jul 20 23:39:09 2013, Erica, DailyProgress, fiber optic, reducing drift in the recombined beam
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Tue Jul 23 10:29:12 2013, Erica, DailyProgress, fiber optic, reducing drift in the recombined beam
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Tue Jul 23 11:43:00 2013, Evan, DailyProgress, Electronics Equipment, Zach's op-amp recommendations
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Fri Jul 26 11:07:44 2013, Erica, DailyProgress, BEAT, circuit for measuring temperature fluctations on CTN table
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Fri Jul 26 11:22:45 2013, Erica, DailyProgress, BEAT, circuit for measuring temperature fluctations on CTN table
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Fri Jul 26 11:45:28 2013, Erica, DailyProgress, BEAT, circuit for measuring temperature fluctations on CTN table
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Mon Jul 29 13:30:26 2013, Erica, DailyProgress, BEAT, adding resistor, capacitor, and sockets
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Tue Jul 30 12:23:41 2013, Erica, DailyProgress, BEAT, addressed noise problem, DC signal
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Thu Aug 1 00:25:02 2013, Erica, DailyProgress, fiber optic, insulating foam
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Fri Aug 2 12:38:41 2013, tara, DailyProgress, fiber optic, insulating foam
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Tue Aug 6 12:31:24 2013, Erica, DailyProgress, fiber optic, insulating foam
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Wed Aug 7 13:27:00 2013, Erica, DailyProgress, fiber optic, more foam, calculations for convertion from voltage to frequency
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Wed Aug 7 18:53:20 2013, Erica, DailyProgress, fiber optic, noise budget, Matlab notes.
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Tue Aug 13 12:39:36 2013, Erica, DailyProgress, fiber optic, rewrote calculations for converting from voltage noise to frequency noise
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Tue Aug 13 12:28:20 2013, Erica, Notes, Electronics Equipment, new AD 590 circuit and its noise calculation, beam alignment
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Fri Aug 16 10:35:44 2013, Erica, Notes, Electronics Equipment, AD590 msrmt, conversion to freq noise
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Tue Jul 30 16:19:32 2013, Erica, Notes, fiber optic, setup for beam recombination
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Mon Aug 5 12:21:00 2013, Erica, Notes, fiber optic, calculation: phase change for fiber
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Tue Jul 30 15:48:47 2013, Erica, DailyProgress, fiber optic, noise for GYRO
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Message ID: 1256
Entry time: Fri Jul 26 11:07:44 2013
In reply to: 1251
Reply to this: 1257
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| Author: |
Erica |
| Type: |
DailyProgress |
| Category: |
BEAT |
| Subject: |
circuit for measuring temperature fluctations on CTN table |
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July 23, 2013
Went to a lecture Alan gave for the CGWAS on data analysis in the morning at Cahill (http://www.cgwas.org/index.php/Caltech_Gravitational-Wave_Astrophysics_School_2013). I had more data, signal from the recombined beam over different time periods that I took so I put those into graphs.
I practiced soldering stuff.
Notes:
Wet the sponge below the iron. You can test to see if iron is hot if you hear the sizzle when you touch the iron to the sponge. A good idea is to cover the iron w/ new solder, since the old solder on the tip has oxidized.
Solder will go where it is hot, so you need to heat both the board and the wire to get a good connection. Good joints look like volcanoes.
Circuit design:
Evan figured out a circuit to for the AD590, as seen below.
The 20k resister determines the voltage that goes to the rest of the circuit. A high pass filter follows, with a capacitor on the order of 100 uF and resistor about 1 M ohm. This takes out the DC signal and AC couples the circuit. The filter will also ignore fluctuations that are slower than 100s. The two resistors connected to the op amp have a gain of 100. The op amp can only have an output up to 15V so with a gain of 100x, it can only take in 0.15 V before it saturates.
Prototyping:
We used a breadboard where we can just plug in the components to see if the circuit works like it want it to. For the high pass filter, we used two 22 uF capacitors in parallel = 44 uF (22uF is the largest WIMA capacitor - film capacitor; anything higher will be ceramic and have a lot more noise; also they may be polarized which is a bit more hassle when wiring stuff up) and two 1 Mohm resistors to make a 2M ohm resistor.
Testing:
We connected the circuit to a function generator and oscilloscope. The function generator was also connected to the oscilloscope (using T connector).
There was a 100x gain, as expected.
Note: make sure the oscilloscope is DC coupled, or else another capacitor will be put into the circuit in the oscilloscope and you won't get the correct signal.
Also, be careful about making the amplitude too large because that can saturate the op amp. If you do both of these things, then you get this weird signal that is trying to be a square wave but failing.
Note: AD590 has a polarization. The pin with the little bump sticking out should be connected to the positive side. |
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