 Mon Nov 28 18:10:23 2022, shane, Update, ELOG, Particle counts in the clean room 
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Particle count stats for the clean room Nov 28, 2022:
Took 10 sample runs in each of 5 regions in the clean room (5 runs per region with a person inside
the clean room for the measurement, and 5 runs per region without anyone in the clean room for the measurement), for a total of 50 samples taken. Sample
time was 60 seconds. Overall clean room average particle count for the size ranges are as follows:
0.3 micrometers- 3405.76 (room occupied), 974.92 (room |
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Fri Feb 3 13:04:04 2023, shane, Summary, General, clean room particle counts 1/25/23
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| Clean room count graphs for each zone (as of January 25, 2023) attached |
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Wed Apr 12 16:17:50 2023, shane, Update, General, Particle Counter moved
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With the added height of the new docking station, the particle counter no longer fits under the Windows monitor in the electronics rack and has been moved
to the desk in the corner of the lab. |
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Fri Jul 28 13:39:39 2023, shane, Update, Cleanroom, full 5 zone cleanroom particle count
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| Here's the 5 zone cleanroom measurement from today. |
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Mon Aug 7 13:58:46 2023, shane, Update, CDS, internal power supply cables done for AI chassis
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Finished assembling and installing the aLigo chassis internal power supply cables in the anti-imaging chassis today. Tested for continuity and everything
looked good. Chassis lid still secured with two temporary screws because I'm not sure what the correct size is. |
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Thu Nov 9 19:06:46 2023, shane, Update, Cleanroom, 5 zone cleanroom measurement
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Here's today's five zone measurement, taken ~5 hours after the cleaning. Zone 5 (closest to fire cabinet and back wall) is a bit over the limit in all size
ranges (about 1500 particles in 1.0u size range over), and zone 2 is slightly over the limit in the 1.0u range, but everything else is under the requirement.
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Fri Nov 10 14:16:04 2023, shane, Update, Cleanroom, new cleanroom zone diagram
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since the vac system has been moved and made permanent, here's a new diagram of the cleanroom zones. The zones themselves haven't moved, but the diagram
has been updated to reflect the new set up of the cleanroom. |
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Thu Jan 18 18:06:49 2024, shane, Update, Cleanroom, cleanroom 5 zone particle count measurement
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| Here's today's full five zone measurement of the cleanroom |
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Fri Feb 2 19:18:24 2024, shane, Update, Cleanroom, cleanroom cleaning and particle count
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[Aiden, Shane, Luis, Luke]
cleaning cleanroom and particle count
5:10 pm: ran zero count test on particle counter
5:14 pm: started particle count
NOTE: initial counts
are significantly above allowed limit. ~10 times larger than ISO class 5 standard in the smallest size range. Realized partway through ceiling tile changes |
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Wed Feb 7 12:43:22 2024, shane, Update, Cleanroom, cleanroom particle counts (full 5 zone measurement)
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| Here's today's full 5 zone measurement of the cleanroom. Everything is back under the requirement. |
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Tue May 7 20:34:31 2024, shane, Update, CDS, frosti MEDM screen update
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[Luis, Shane]
Here is the updated MEDM screen, with new orientation and updated labeling to reflect the actual positions of the heater elements. Note that
indices start at T0 to be consistent with simulink model, though in the previous elog for the FROSTI layout the heater elements are labeled 1-8.
Also,
we finally learned how to take a screenshot on debian. |
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Wed Oct 2 10:31:46 2024, Xuesi Ma, Configuration, , Group Meeting Slides 10/2/2024
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Group Meeting slides for Non-deterministic Heater Response.
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Tue Oct 15 15:27:38 2024, Xuesi Ma, Update, ELOG, Timing Chassis Update 12x
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I conducted separate tests on the '5015' and '3010a'. When powered individually, the '5015' outputs a signal at 33.55 MHz with an amplitude of 608
mV. It draws 1 A of current from the power source. The input signal for the '3010a' is 33.54 MHz with an amplitude of 670 mV (peak-to-peak) and a 15 mV
DC offset. The output signal from channel 1 is a 65.5 kHz square wave with an amplitude of 3.28 V. The '3010a' draws 0.1 A of current.
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Fri Jun 28 10:43:13 2024, Xuejun, Update, Cleanroom, Frosti
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[Xuejun, Tyler]
We moved Frosti into the cleanroom and debugged it to make sure everything was working. One of the DB25 pins broke off at the connector
for element 1 so it needed to be recrimped. Element 6 short circuited but fixed with adjustment to the heater power pin position. We connected the power
and sensor connectors to the power box and recalibrated the RTD sensors.
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Mon Jul 8 10:39:14 2024, Xuejun, Update, FLIR, Average Temperature Profile
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After taking data for each of the individual heater elements, I imported them into python and overlayed them to produce an average temperature profile.
I rotated the 7 of the elements to align with element 1's profile and averaged them out. By setting the range to 28C - 33C (this gave the best visibility
of the heating pattern) it gave the profile attached. |
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Tue Aug 6 13:07:07 2024, Xuejun, Update, Interferometer Simulations,
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[Xuejun]
The width and location of the measured in-air change in temperature profile has been determined to be 0.045m and 0.137m respectively. Subsequently,
a fake irradiance profile was able to be generated that best resembled what the actual irradiance profile could be using this information for testing in
COMSOL. The generated irradiance profile that output the most similar change in temperature profile as the measured in-air profile has been included as |
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Mon Oct 9 11:29:37 2023, Tyler, Update, Electronics, PSD/CSD Plot Updates
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Continuing from Sophia's SURF Project this summer: Plotting the Power-Spectral Densities (PSDs) and Cross-Spectral Densities of two signals.
A continued
issue that has been observed in the plots is the random "jump" of one PSD curves. Below, a 1.4 kHz signal is driven with a magnitude of 0.7 Vpp, and connected
to the two output ports of the Red Pitaya via an SMC T-Adapter. At the moment, I anticipate that this bug might have something to do with the Real-Time |
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Mon Oct 23 11:28:05 2023, Tyler, Update, Cameras, FLIR Camera Code Updates
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The past week I've been spending time going through the FLIR code on gitlab. Initially, it had appeared that our measurements with the camera had differed
about 2 degrees C from what the thermocouple was giving (Ref ELOG 181). Upon inspection of the FLIR streaming code, I noticed a few issues:
1. The emissivity
value wasn't set correctly (was 0.999 originally, should be about 0.95).
2. The ambient temperature was set to about 21.6 C (71 F).
3. The distance given |
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Mon Oct 30 11:03:56 2023, Tyler, Update, Scripts/Programs,
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FLIR: After some adjustments, the plot generated from the FLIR measurements look much more symmetric (see attachment). There are more included grid
points, which smooths out the curve as compared to last week.
Red Pitaya: It looks like a new OS update was released for the RP, which includes
a new Python API (was previously only available in C). I'm going to try and update the one we have currently running in lab.
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Mon Nov 6 11:29:24 2023, Tyler, Update, Electronics, Preliminary RTD Calculations, RP Software Update
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Preliminary RTD calculations are shown below, given an input of 10 V and desiring a few mA of current. It looks like R_ref should be at least 1 kOhm
(refer to plots/circuit below), keeping in mind we need to have
RP: The Red Pitaya Software was updated to OS 2.00. All examples on the RP website should run without issue. |
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Mon Nov 13 11:07:50 2023, Tyler, Update, VAC, RTD Analysis
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After initial analysis from last week on a single RTD, I then extended to looking at all 8 in series with R_ref (set to 1 kOhm). Shown below are the
edge cases for the setup:
RTDs are all at ambient lab temperature. This would correspond to a minimum resistance value.
RTDs all read out 400 C. This gives the maximum resistance value.
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Mon Nov 20 10:10:50 2023, Tyler, Configuration, Electronics, RTD Logic/Schematic Diagrams
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Below are a basic diagram of what the RTD measurement circuit logically looks like and an example schematic of the actual wiring. The schematic wiring
will be placed internally into a chassis, connected to the RTDs via DB25 cable.
Note: The DB25 Breakout Board connector is Female, not Male. |
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Tue Nov 21 14:47:24 2023, Tyler, Update, Lore, 1129 Workbench Assembly Update 1
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[Tyler, Shane, Mohak, Cynthia, Luke, Michael, Luis]
Started assembly of the workbench equipment today. We completed the stools, and have constructed the frames of each workbench. All that needs to
be added are the tabletops and the top shelves, which will be done on Monday. |
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Mon Nov 27 14:22:30 2023, Tyler, Update, Lore, 1129 Assembly Update
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[Tyler, Michael, Luke, Cynthia]
The tabletops have been attached to the workbench frames. Unfortunately, one of the tabletops came out of the box
with a large scratch and small dent in the middle. One of the electric top shelves is ready to be attached to the undamaged table, but the other is yet
to be opened. Assembly will be completed Wednesday morning.
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Thu Nov 30 13:50:32 2023, Tyler, Update, Lore, Workbench Assembly Completed
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[Tyler, Luke, Aiden]
The workbenches are now completely assembled and put into their final places. Additionally, the tool chest has been moved.
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 Tue Jan 9 12:08:59 2024, Tyler, Configuration, Electronics, RTD Readout Chassis Update
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Below is the current state of the RTD readout chassis wiring. Initial continuity tests seem good, will run through one more time to confirm.
Quote:
The custom front and rear panels for |
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Tue Jan 16 12:20:21 2024, Tyler, Configuration, Electronics, RTD Readout Chassis Update 2
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I performed another continuity test on the RTD chassis wiring, and everything seems to be set up correctly. The chassis should be ready for installation.
Quote:
Below is the current state of the |
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Tue Jan 23 12:17:41 2024, Tyler, Update, Electronics, RTD Chassis
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After updating the wiring in the RTD Chassis, a signal is now seen at each ADC input. However, there seems to be a discrepancy between the voltages
I measured out with the multimeter (see below). Next steps include:
Finish final debugging
Calibrate ADC inputs with known voltage source (likely to use DAC).
Voltage Readings:
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Tue Jan 30 11:36:19 2024, Tyler, Update, Electronics, RTD Chassis
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Quote:
After updating the wiring in the
RTD Chassis, a signal is now seen at each ADC input. However, there seems to be a discrepancy between the voltages I measured out with the multimeter (see |
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Tue Feb 13 11:54:45 2024, Tyler, Configuration, FLIR, In-Air Optical Test Configuration
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Below is the proposed schematic for FROSTI optical testing, chosen so enough space is allotted for prototype assembly.
Steps to be taken include:
Reconstruct FLIR staging apparatus
Move test mass stand-in to cleanroom
Mark FLIR camera position on cleanroom |
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Tue Feb 13 12:26:23 2024, Tyler, Update, Interferometer Simulations, BS Code Update
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I reproduced Cao's CE beamsplitter code (see below for example plots). I received the current info on the beamsplitter parameters for A+ and A# from
GariLynn also. The next steps are to perform a similar power loss analysis on the anticipated A# beamsplitter. |
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Tue Feb 20 11:31:49 2024, Tyler, Update, Cleanroom, Garment Cabinet Door Replacement
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[Luis, Luke, Pooyan, Tyler]
The replacement door for the HEPA garment cabinet arrived last week, and was installed on Thursday. However, it looks
like there's a small gap between the door and where the hinge is attached to the cabinet frame. No screws were provided with the replacement door. If we
want to perform any adjustments, we have to be very careful; the screws break very easily.
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Fri Feb 23 18:03:27 2024, Tyler, Update, FLIR, Optical Test Setup in Cleanroom
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[Tyler, Xuesi]
The FLIR and test mass stand-in have been transferred into the cleanroom. A software test will be run as soon as we get an ethernet
cable long enough to reach into the cleanroom where the camera is set up. Once this is finished, the FLIR will be moved aside for construction of the FROSTI!
When completed, the camera will be placed back into position for in-air optical testing.
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Wed Feb 28 12:02:08 2024, Tyler, Update, General, Resistors for Heater Elements Update
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Power Res (Ohm) RTD Res (Ohm)
Heater 1= 72.8; 80.6
Heater 2= 69.5; 80.8
Heater 3= 70; 83.2
Heater 4= 70.6; 78.7
Heater
5= 69.9; 80.6
Heater 6= 71.1; 78.2
Heater 7= 68.5; 76.8
Heater 8= 70.1; 82.8
Quote:
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Wed Feb 28 17:49:18 2024, Tyler, Update, TCS, FROSTI Assembly - Days 2-3
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[Aiden, Jon, Luis, Luke, Michael, Tyler]
FROSTI assembly was completed today. The RTD and power wires were terminated at the DB-25 connectors and
the legs were put on. It is currently placed in front of the stand-in test mass (~5 cm away). The FLIR has also been moved back to it's nominal position.
As of now, it appears there are some shorts within the power cabling. This will be a focus of tomorrow's work.
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Wed Mar 6 09:57:52 2024, Tyler, Update, TCS, FROSTI Wiring
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Upon finishing the FROSTI assembly last week, we ran into some electrical issues. An electrical short was found between two of the d-sub pins (2 and
8). It appears that the pins were somehow coming into contact with the aluminum surrounding them. This was causing the power supply to trip. The issue
was seemingly fixed by adjusting the positioning of the cabling leading out of the reflector. When handling the device in the future, please make sure |
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Tue Mar 19 10:55:30 2024, Tyler, Update, FLIR, In-Air Optical Test
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Below is an image I took using the FLIR just before leaving for the LVK meeting. The profile is roughly what we would expect (annular). Any distortions
seen are likely from the screen not being completely parallel to the plane of the FroSTI (i.e. the screen slightly bends in various locations). Next step:
In-vacuum test at CIT. |
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Thu Mar 21 16:56:42 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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[Jon,Tyler]
We noticed that the RTD temperature readings given on the Cymac were off, and traced the issue to miscalibration in the relationship
between the resistance and temperature of each RTD (Callendar-Van Dusen eqn). Below is the table of values inferred from independent measurements of temperature
and resistance to rectify this problem. This data was then fitted to better determine the coefficients present in the temperature-resistance relation: |
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Mon Mar 25 10:55:33 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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Refitted RTD calibration, neglecting quadratic term:
R_0 (ohm) Alpha (1/C)
RTD 0 79.3962 0.002031
RTD 1 78.2874 0.002530 |
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Tue Mar 26 13:51:56 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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Another re-fit, but this time the quadratic coefficient (beta) is set to 1.003e-6:
R_0 (ohm) Alpha
(1/C)
RTD 0 79.7386 0.001863 |
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Thu May 2 22:43:36 2024, Tyler, Update, Electronics, RTD Readout Chassis Redesign
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[Tyler, Jon]
Today the FROSTI RTD readout chassis underwent a redesign:
Instead of the original ratiometric method, which involved wiring the FROSTI RTDs in series, each element is individually powered by separate
excitations. Each element additionally possesses its own reference resistor of 100 Ohm. Now, if an RTD experiences an electrical short, it should not affect |
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Mon May 13 13:03:41 2024, Tyler, Update, FLIR, Readout Code Updates
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[Tyler]
Some changes have been made to the FLIR readout code to help improve its functionality:
More accurate temperature readings
than before due to updates in the calculation procedure. A bug was causing one of the parameters to not update correctly; this is now fixed.
Saved
data now stored in HDF5 files rather than CSV.
User can now enable automatic data storage by specifying a collection interval (in minutes). The |
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Mon Jun 3 14:14:39 2024, Tyler, Update, FLIR, Initial CIT FROSTI Analysis
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[Tyler]
Attached below are the initial results of the CIT FROSTI testing analysis.
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Mon Jun 10 14:52:38 2024, Tyler, Update, FLIR, CIT FROSTI Analysis Update
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[Tyler]
Upon further inspection, one adjustment was made to the FROSTI profile analysis: changing the transmission value of the ZnSe viewport. It
was initially assumed that the viewport possessed an AR coating, which would bring the transmission into the 90% range. Without the coating, it drops to
roughly 70%. Assuming no coating, the estimated delivered power was calculated to be 11.7 W. This is consistent with the estimated power given from the |
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Mon Jul 29 13:39:16 2024, Tyler, Update, DAQ, RTD Parameter Calibration
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[Tyler]
Using the data taken during the FROSTI testing at Caltech, I attempted to find a better calibration of the RTD sensors, given our past issues
with inaccurate readings. The fit parameters, alpha and beta, are still all different from the initial values given to us by Fralock (alpha = .003, beta
= 1.003e-6, R_0 was not given), but the true values will differ based on factors such as part geometry.
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Mon Jul 29 14:30:16 2024, Tyler, Update, Cleanroom, RIN Measurement Set-up
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[Tyler]
I have begun moving parts into the cleanroom for the upcoming FROSTI RIN tests that will be conducted within the next few weeks. While waiting
for the rest of the equipment to arrive to perform the full-scale tests, I have additionally moved the FROSTI under the shelf above the optical table,
where it will stay for the meantime. As always, please use caution when in the cleanroom. Aside from the FROSTI, the IR photodetectors that will be used |
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Mon Aug 12 16:24:34 2024, Tyler, Update, Cleanroom, RIN Measurement Update 1
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[Tyler]
For some preliminary tests, I moved the IR photodetectors outside of the cleanroom and onto the other optical table. The basic goal was
to obtain a signal from both photodetectors. To achieve this, one of the heater cartridges used for early FLIR measurements months ago was hooked up to
a power supply (PS). The PS was set to supply 0.20 A with a voltage of 2.8 V; the corresponding power is thus 0.56 W. With this, I was able to measure |
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Tue Sep 3 18:24:17 2024, Tyler, Update, CDS, Cymac Timing Chassis Issue
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[Tyler, Jon]
The timing chassis used for the cymac has been shut off due to an unknown issue causing its supplied current to fluctuate. All real-time
models will be suspended until a solution is found.
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Mon Sep 16 14:59:51 2024, Tyler, Update, TCS, FLIR RIN Update 09/16
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Below is the dark noise spectrum of the Red Pitaya, which was measured over the course of a weekend. Additionally, I have successfully measured a signal
from the photodetectors with the FROSTI as the IR source, so it seems there shouldn't be any worry of these particular detectors not being feasible for
the RIN measurement. |
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Mon Sep 23 15:11:21 2024, Tyler, Update, Scripts/Programs, Effective Emissivity Analysis and RIN Update
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A quick update on the effective emissivity analysis for the CIT FROSTI testing:
I was able to (roughly) match the OPD data to a referenced COMSOL model, with an applied power of 12.6 W (as seen below). However, when changing
the emissivity of the ETM in COMSOL, the dT profiles do not seem to change much. I am not sure as to why this is the case at the moment, and will continue |