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ID Date Authorup Type Category Subject Text Attachments
  Draft   Fri Oct 28 21:39:34 2022         
  Draft   Mon Oct 31 23:51:15 2022         
  11   Fri Apr 23 10:41:22 2021 AidanGeneralDesign specs2 um photodiode requirementsMCT HgCdTe requirements: https://docs.google.com/spreadsheets/d/1lajp17yusbkacHEMSobChKepiqKYesHWIJ6L7fgr-yY/edit?usp=sharing

 
  
  35   Fri Oct 1 13:24:40 2021 AidanGeneralDesign specsTM Barrel coating emissivityI have to question whether this passes
a sanity test. Surely in the case of Stack
2, the 10um thick Ta2O5 will absorb the majority
  
  112   Wed Oct 26 21:27:23 2022 JenniferGeneralOptical ContactingPWM 3.1 (more) very slow heating[I'm (once again) behind on data processing,
but I'm creating an entry on the day
I actually run the tests]
  
  62   Mon Jul 11 16:24:31 2022 Jennifer HritzGeneralOptical ContactingBaselining the temperature output of the Oster hot plateThis was performed last Friday (7/8).

I secured a thermocouple perpendicular
against the hotplate and recorded the
 PXL_20220708_230038748.jpgPXL_20220708_230234841.MP.jpg 
  63   Mon Jul 11 17:27:39 2022 Jennifer HritzGeneralOptical ContactingFirst successful bondNote that the slides have "GLOBE"
printed on one side. I always bond the opposite
using the opposite side without the text.
 PXL_20220712_223449788.MP.jpg 
  66   Thu Jul 14 14:55:01 2022 Jennifer HritzGeneralOptical ContactingTesting isopropanol and methanolNote that I am just testing out different
techniques, so I have not set up the thermocouples
to precisely measure the temperatue.
 PXL_20220714_220953206.MP_2.jpgPXL_20220714_220940258.MP_2.jpgPXL_20220714_222105409.jpgPXL_20220713_003923957.jpg 
  71   Wed Jul 27 14:50:20 2022 Jennifer HritzGeneralOptical ContactingBonding without liquids and narrowing down heating issueI have found that, after cleaning the glass
with methanol (or even sometimes with just a dry
lense-cleaning cloth), I can get glass slides to
 PXL_20220727_214658230.jpgPXL_20220727_214241668.mp4 
  73   Thu Aug 4 13:44:56 2022 Jennifer HritzGeneralOptical ContactingSuccess with slowly heatingYesterday, I did two rounds of slowly heating
4 samples to the maximum hot plate temperature.
This was to formally test if my success
 PXL_20220803_232203193.jpgPXL_20220804_002433906.jpg 
  77   Tue Aug 16 19:54:29 2022 Jennifer HritzGeneralOptical ContactingRazor blade testWe succeeded in setting up an apparatus
for quantifiying the razor blade test. After
mounting the glass slides such that
 PXL_20220817_023737796.MP.jpgPXL_20220817_023741865.MP.jpg 
  82   Tue Sep 27 22:29:34 2022 Jennifer HritzGeneralOptical ContactingRazor test apparatus disassembly picturesPictures of the razor test apparatus before
and after disassembly, to make future reassembly
easier.
 razor_before_PXL_20220817_211123631.MP.jpgrazor_after_PXL_20220911_062818511.MP.jpg 
  83   Wed Sep 28 22:11:31 2022 Jennifer HritzGeneralOptical ContactingLooked at Thor Lab slidesWhile finalizing my work plan for the quarter,
I decided to look at the Thor Lab slides.
This was instructive because they highlighted
 thor_lab_slides_first_bond_PXL_20220929_045352675.MP.jpgthor_lab_slides_after_attempting_to_expand_bond_area_PXL_20220929_045510075.MP.jpg 
  84   Thu Sep 29 18:36:40 2022 Jennifer HritzGeneralOptical ContactingLooked at Thor Lab slides (continued)Continuining with my casual exploration
of the Thor Lab slides, I heated them from
off --> low --> med --> high, with
 before_heat_PXL_20220930_011031420.MP.jpgset_up_PXL_20220930_011050114.MP.jpgright_after_heating_PXL_20220930_014301900.MP.jpgafter_4ish_hours_of_cooling_PXL_20220930_063533904.jpg 
  86   Fri Sep 30 21:51:31 2022 Jennifer HritzGeneralOptical ContactingQuick test heat and pressure testGiven that these glass slides are much
thinner than the ones I worked with prior,
I suspected they would be more receptive
 pressure_set_up_PXL_20221001_040539385.MP.jpgsamples_before_pressure_PXL_20221001_040441662.MP.jpgheat_w_pressure_set_up_PXL_20221001_033228622.MP.jpgsamples_before_heat_w_pressure_PXL_20221001_034620991.MP.jpg 
  87   Sat Oct 1 23:00:03 2022 Jennifer HritzGeneralOptical Contacting(RESULTS!) Quick test heat and pressure testThese are the results from the previous
log.
 samples_before_AND_after_pressure_PXL_20221002_054158446.MP.jpgsamples_before_AND_after_heat_w_pressure_PXL_20221002_053842185.MP.jpg 
  88   Sun Oct 2 23:23:07 2022 Jennifer HritzGeneralOptical ContactingCause of improved bond: time or pressureBefore jumping to conclusions based on
my previous results, I wanted to check that
it was indeed heat and pressure, not time,
 before_time_on_left_pressure_on_right_PXL_20221003_061828860.MP.jpgset_up_time_vs_pressure_PXL_20221003_062018249.MP.jpgin_progress_time_vs_pressure_PXL_20221003_062117715.MP.jpg 
  89   Mon Oct 3 23:32:30 2022 Jennifer HritzGeneralOptical ContactingCause of improved bond: time or pressure (Update)I was unable to check the samples because
I could not get access to Bridge, so they
will be checked tomorrow and the results
 pressure_v_time_samples_both.jpg 
  90   Tue Oct 4 22:15:23 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM Test #1I wrote a program to control the heating
rate of the hot plate using Pulse Width Modulation
(PWM), and it was a great success!
 PWM_Test_#1_(first_300_sec).pdfframe_from_pwm_test1_video_PXL_20221005_064240498_exported_231444.jpg 
  91   Wed Oct 5 23:24:08 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM Test #2I repeated the first test, but let the
hot plate run longer. It revealed that the
linearity for the lower temperatures completely
 PWM_Test_#2.pdfPWM_Test_#2_(comparison).pdf 
  92   Fri Oct 7 00:21:24 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM Test #3The previous test was cycled with 0.3s
on follwed by 0.7s off*. This test was 0.7s
on followed by 0.3s off. I intended to let
 PWM_Test_#3.pdfPWM_Test_#3_(comparison).pdfhot_plate_cycler_v1.zipPWM_tests_1-3.zip 
  93   Fri Oct 7 21:20:08 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2 progressI had a little set back regarding the non-linear
portion of the heating. After about 150°C,
if the heating rate is kept constant, the
 PWM_Test_#2_(log_comparison).pdfPWM_Test_#3_(log_comparison).pdf 
  94   Sat Oct 8 23:22:25 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2 test #1I had some trouble with the code not working
as intended (partially because it has been
I while since I coded in C++).
 PWM_v2_Test_#1.pdf 
  95   Sun Oct 9 21:55:53 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2 test #1 & 2For the following two graphs, I ram
four tests: two using the the v1 of the PWM
code and two using v2 of the PWM code. The
 PWM_v2_Test_#1_-_increase_180°C_in_10_minutes.pdfPWM_v2_Test_#2_-_increase_180°C_in_7_minutes.pdf 
  96   Mon Oct 10 15:34:13 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.1,2,3 Test #1 and v2.3 Test #2Before trying the PWM on actual samples,
I wanted to make one final attempt at improving
my code (labled as v2.1). This change
 PWM_v2.1_test1_max_rate_reached_and_peak_heat.jpg 
  97   Tue Oct 11 23:59:07 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.3 Test #1 and 2Here are the graphed results from
yesterday's tests, both by themselves
and overlayed with the previous tests. I
 PWM_v2.3_Test_#1_-_increase_180°C_in_10_minutes.pdfPWM_v2.3_Test_#2_-_increase_180°C_in_7_minutes.pdfPWM_v2_Test_#1_-_increase_180°C_in_10_minutes.pdfPWM_v2_Test_#2_-_increase_180°C_in_7_minutes.pdf 
  98   Wed Oct 12 23:26:48 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.3 Test #3I tried increasing the temperature by 180°C
over 20 minutes. As suspected, it did not
quite reach the target temperature because
 PWM_v2.3_Test_#3_-_increase_180°C_in_20_minutes.pdf 
  99   Thu Oct 13 20:56:48 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.4,5 Test #3My two corrections ended up being huge
overshoots. The drop off time (100°C)
is correct, but the default rate increase
 PWM_v2.3_Test_#3_-_increase_180C_in_20_minutes.pdf 
  100   Fri Oct 14 21:36:52 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.6 Test #3The goal of "v2.X test #3" is
to heat the hot plate to 200°C over the
course of 20 minutes, and with v2.6, I have
 PWM_v2_Test_#3_-_increase_180°C_in_20_minutes.pdfPWM_v2.6_Test_#3_-_increase_180°C_in_20_minutes.pdfcycler_v1_graphs.zipcycler_v2_graphs.ziphot_plate_cycler_v1-2.6.zip 
  101   Sat Oct 15 21:59:13 2022 Jennifer HritzGeneralOptical ContactingHot plate PWM v2.6 Test #1, 2, 3I realized that, after changing so much
from v2.3 to 6, I should check that my first
two tests produce correct results with the
 PWM_v2.6_Test_#1_2_3_-_increase_180C_in_10_7_20_minutes.pdfPWM_v2.6_tests_data.zip 
  102   Sun Oct 16 14:20:32 2022 Jennifer HritzGeneralOptical ContactingSamples after 2 weeks under pressureSince I was focusing on the hot plate code
and therefore did not need my weights, I
decided to leave them on top of my samples
 2_weeks_pressure_PXL_20221004_190652540_20221017_074745619.jpg 
  103   Mon Oct 17 23:17:25 2022 Jennifer HritzGeneralOptical ContactingTesting PWM code with actual samplesNow that I have (relatively) good PWM code,
I wanted to do my first real test with actual
samples. Since everything went smoothly,
 first_real_PWM_test_samples_before_PXL_20221018_071840794.MP.jpgfirst_real_PWM_test_set_up_PXL_20221018_071943406.MP.jpgfirst_real_PWM_test_in_action_PXL_20221018_072832135.mp4 
  104   Tue Oct 18 19:33:38 2022 Jennifer HritzGeneralOptical ContactingSetting up thermocouplesFirstly, last night's heating did not
change the contacted surface area greatly,
but there is too many factors to speculate
 first_real_PWM_test_samples_before_after_PXL_20221018_080838426.MP.jpgK_Type_connector_PXL_20221019_000708969.MP.jpgthermocouple_plates_PXL_20221019_003002817.MP.jpg 
  105   Wed Oct 19 21:51:10 2022 Jennifer HritzGeneralOptical ContactingThe trials and tribulations of the thermocouplesI intended to test the new thermocouple
set up today, but when I plugged them in,
both did not read a temperature. It took
 thermocouple_connector_test_ciruit_PXL_20221020_035719119.MP.jpgcorrect_assembly_PXL_20221020_042855181.MP.jpgresistance_through_broken_and_fixed_connector_PXL_20221020_035951538_20221020_041939698.MP.jpgbroken_and_fixed_thermocouple_PXL_20221020_042242792_20221020_042201775.MP.jpgthermocouples_and_thermometers_room_temp.zip 
  106   Thu Oct 20 22:43:05 2022 Jennifer HritzGeneralOptical ContactingWired the thermocouples backwardsSince the two devices are giving different
temperature readings, I would like to find
out if this imprecision is linear (e.g. they
 wrong_correct_polarization_PXL_20221022_054250498_20221022_055117337.MP.jpg 
  107   Fri Oct 21 22:22:37 2022 Jennifer HritzGeneralOptical ContactingPWM v2.6 on new thermocouple set upI performed the same tests I have been
doing prior (+180°C in 10 minutes)
but now with the (correctly wired) thermocouples
 PWM_plates_-_increase_180C_in_10_minutes.pdf 
  108   Sat Oct 22 21:18:56 2022 Jennifer HritzGeneralOptical ContactingPWM v3.0With v3.0, I took a couple steps backwards
by getting rid of the feature that increases
the heating rate so I can isolate the base
 PWM_plates_-_increase_280C_in_10_minutes.pdf 
  109   Sun Oct 23 21:01:40 2022 Jennifer HritzGeneralOptical ContactingPWM 3.0 (+280C in 5)I decided test how fast the plates
would heat up if the heat was just on constantly
on for 5 minutes. In general, these tests
 PWM_plates_-_increase_280°C_in_5_minutes.pdf 
  110   Mon Oct 24 21:23:22 2022 Jennifer HritzGeneralOptical ContactingPWM 3.1 longer off times in cycleTo combat the bottom plate heating up much
faster than the top plate, I decided to try
increasing the cycle period from 1000ms (1s)
 PWM_plates_-_1000_ms_on_9000_ms_off.pdf 
  Draft   Tue Oct 25 18:55:38 2022 Jennifer HritzGeneralOptical ContactingPWM 3.1 very slow heating[I'm behind on data processing, but
I'm creating an entry on the day I actually
run the tests]
  
  Draft   Thu Oct 27 19:54:20 2022 Jennifer Hritz   Somehow I never thought of this before,
but instead of increasing the "on"
time of the hot plate to account for the
  
  22   Tue Aug 24 08:15:37 2021 Jiri SmetanaGeneralGeneralActuation Feedback ModelI'm posting a summary of the work I've
done on the Lagrangian analysis of the Mariner
suspension design and a state space model
 actuator_feedback_diagram.pngbode_servo.pngbode_plant.png 
  26   Wed Sep 15 09:15:21 2021 Jiri SmetanaGeneralGeneralActuation Feedback Model and NoiseI've implemented a more extensive feedback
model that uses proper conversions between
metres, volts, counts etc. and includes all
 displacement_asd.pngservo.pngsystem_loop.mground_freq.txtground_xx.txt 
  27   Thu Sep 16 10:02:47 2021 Jiri SmetanaGeneralGeneralActuation Feedback Model and NoiseHere's the DAC voltage spectrum with
its associated RMS.

Also, for clarity, this model is
 DAC_voltage.png 
  39   Tue Oct 12 12:44:44 2021 Jiri SmetanaGeneralGeneralNew Damping Loop ModelI've ironed out the issues with my
MATLAB model so that it now shows correct
phase behaviour. The problem seems to arise
  
  40   Tue Oct 12 12:49:42 2021 Jiri SmetanaGeneralGeneralDamping Loop (Point-Mass Pendulums)Now that I have correct phase and amplitude
behaviour for my MIMO state space model of
the suspension and the system is being correctly
 servo.pngopen_loop.pngclosed_loop.pngnoise.pnglength_change.png 
  41   Thu Oct 14 04:17:36 2021 Jiri SmetanaGeneralGeneralDamping Loop (Point-Mass Pendulums)Here are the DAC and residual displacement
spectra for different suspension heights
ranging from 450 mm to 600 mm. I aimed to
 8x 
  44   Tue Oct 26 08:09:08 2021 Jiri SmetanaGeneralGeneralLagrangian Suspension Model - Extended BodyI've been testing out the extended
body lagrangian models and I'm trying
to understand the ground motion and force
 comparison_xg.pngcomarison_F.png 
  49   Wed Nov 17 09:27:04 2021 Jiri SmetanaGeneralGeneralLagrangian Model - Translation & PitchI've been having a look at the transfer
functions for the translation and pitch of
both masses. I'm attaching the plot of
 plant_all_tfs.png 
  50   Wed Dec 15 06:43:43 2021 Jiri SmetanaGeneralGeneralLagrangian Model - Translation & PitchI've checked the validity of my state
space model in a couple of ways so that we
have confidence in the results that it gives.
  
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