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Tue Jul 2 11:21:24 2013, Erica, DailyProgress, fiber optic, mode matching        Wed Jul 3 09:46:48 2013, Erica, DailyProgress, fiber optic, mode matching           Thu Jul 11 01:40:19 2013, Erica, DailyProgress, fiber optic, mode matching              Fri Jul 12 00:51:39 2013, Erica, Notes, fiber optic, mode matching                 Tue Jul 16 10:27:47 2013, Erica, Notes, fiber optic, mode matching, beam recombination                    Tue Jul 16 11:02:47 2013, Erica, Notes, fiber optic, mode matching, beam recombination                       Wed Jul 17 11:58:47 2013, Erica, Notes, fiber optic, mode matching, beam recombination                          Wed Jul 17 18:29:37 2013, Erica, DailyProgress, fiber optic, reducing drift in the recombined beam                             Sat Jul 20 23:39:09 2013, Erica, DailyProgress, fiber optic, reducing drift in the recombined beam                                Tue Jul 23 10:29:12 2013, Erica, DailyProgress, fiber optic, reducing drift in the recombined beam                                   Tue Jul 23 11:43:00 2013, Evan, DailyProgress, Electronics Equipment, Zach's op-amp recommendations                                   Fri Jul 26 11:07:44 2013, Erica, DailyProgress, BEAT, circuit for measuring temperature fluctations on CTN table                                      Fri Jul 26 11:22:45 2013, Erica, DailyProgress, BEAT, circuit for measuring temperature fluctations on CTN table                                         Fri Jul 26 11:45:28 2013, Erica, DailyProgress, BEAT, circuit for measuring temperature fluctations on CTN table                                            Mon Jul 29 13:30:26 2013, Erica, DailyProgress, BEAT, adding resistor, capacitor, and sockets                                               Tue Jul 30 12:23:41 2013, Erica, DailyProgress, BEAT, addressed noise problem, DC signal                                                  Thu Aug 1 00:25:02 2013, Erica, DailyProgress, fiber optic, insulating foam                                                     Fri Aug 2 12:38:41 2013, tara, DailyProgress, fiber optic, insulating foam                                                        Tue Aug 6 12:31:24 2013, Erica, DailyProgress, fiber optic, insulating foam                                                           Wed Aug 7 13:27:00 2013, Erica, DailyProgress, fiber optic, more foam, calculations for convertion from voltage to frequency                                                              Wed Aug 7 18:53:20 2013, Erica, DailyProgress, fiber optic, noise budget, Matlab notes.                                                                 Tue Aug 13 12:39:36 2013, Erica, DailyProgress, fiber optic, rewrote calculations for converting from voltage noise to frequency noise                                                           Tue Aug 13 12:28:20 2013, Erica, Notes, Electronics Equipment, new AD 590 circuit and its noise calculation, beam alignment                                                              Fri Aug 16 10:35:44 2013, Erica, Notes, Electronics Equipment, AD590 msrmt, conversion to freq noise                       Tue Jul 30 16:19:32 2013, Erica, Notes, fiber optic, setup for beam recombination                       Mon Aug 5 12:21:00 2013, Erica, Notes, fiber optic, calculation: phase change for fiber        Tue Jul 30 15:48:47 2013, Erica, DailyProgress, fiber optic, noise for GYRO

Message ID: 1284     Entry time: Wed Aug 7 13:27:00 2013     In reply to: 1282     Reply to this: 1286 Author: Erica  Type: DailyProgress  Category: fiber optic  Subject: more foam, calculations for convertion from voltage to frequency

august 6, 2013 We better insulated the exposed fiber by sandwiching it on both sides with foam. Instead of the aluminum foil, we used the bubble wrap that we used previously to cover the holes. We did this because the aluminum could be vibrating, which causes more noise. I was able to take spectrum data since the drift was slow enough, at least 30s on the linear region. The laser was not locked to the cavity when I took the data. I'll be putting it into matlab The data was taken with the span at 400 Hz, 1.6 kHz, and 12.8 kHz. I took 50 averages I tried to take the data so the pk-pk voltage would be the same but it still drifted a little bit. For the data taken wtih the 1.6 kHz and 12.8 kHz, deltaV = 2.24V, Vmax = 2.7V, Vmin= 460 mV For the 400 Hz, deltaV = 2.10V, Vmax = 2.56 V, V min = 460 mV. The y-axis from the graph is in V/rt(Hz). Here is the calculation done to calibrate between V and length change. see the correct calculation in 1286 *NOTE: I made an error in the calculations here. \phi = kx. But when I plugged in pi/4 to solve for dV/dx at pi/4, I did not multiply it by two. See Here is the conversion from length to frequency.

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