ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
138
|
Fri Aug 25 13:25:05 2023 |
Radhika | General | General | Summary of JPL/Ball cryocooler discussion | Here is a summary of the cryocooler discussion
hosted at JPL.
Dave Glaister of Ball Aerospace |
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137
|
Wed Aug 23 16:34:47 2023 |
Sophia Adams | General | Optical Contacting | Matlab Cantilever Geometry Optimization | Here is the code to generate a random list
of parameters and evaluate the energy ratio
of each. |
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136
|
Wed Aug 23 11:13:58 2023 |
Sophia Adams | General | Optical Contacting | Matlab fminsearch Cantilever Geometry Optimization | I am trying to get a plot of the fminsearch
data, but I was not sure how to extract the
data. But fminsearch has built in plots that |
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135
|
Tue Aug 22 13:14:22 2023 |
Sophia Adams | General | Optical Contacting | Matlab fminsearch Cantilever Geometry Optimization | Restricting the search to nothing less
than the initial parameters (L = 2 cm, h
= 0.3 mm, d = 0.55 mm), fminsearch outputs |
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134
|
Tue Aug 22 12:12:05 2023 |
Sophia Adams | General | Optical Contacting | Matlab fminsearch Cantilever Geometry Optimization | The code works now. If the function is
specified by a file, there should be an @
symbol front of it when it is passed into |
|
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133
|
Tue Aug 22 10:16:54 2023 |
Sophia Adams | General | Optical Contacting | Matlab fminsearch Cantilever Geometry Optimization | I am trying to use fminsearch to find the
best cantilever dimensions to maximize the
bond/cantilever energy ratio. Fminsearch |
|
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132
|
Fri Aug 4 17:07:41 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Here is the model including an additional
LN2 tank aiding in inner shield cooldown, |
|
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131
|
Mon Jun 26 13:53:40 2023 |
Sophia Adams | General | Optical Contacting | cantilever geometry to find the quality factor of a silicon bond | I am trying to design a cantilever setup
to find the quality factor of optically bonded
silicon. The cantilever will be given an |
|
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130
|
Fri Jun 23 15:37:39 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | I simulated the Mariner cooldown with an
additional
LN2 tank connected to the main cold strap |
|
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129
|
Fri Jun 2 11:31:29 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Summarizing the current Mariner ITM cooldown
model assumptions:
- Inner shield and outer shield |
|
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128
|
Wed Apr 12 12:03:34 2023 |
Radhika | General | Heat Load | Mariner TM Cooldown model | Here we lay out the Mariner cryocooler
requirements and discuss the most recent
cooldown model, which includes a cryocooler that cools |
|
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127
|
Fri Mar 24 20:27:46 2023 |
Jennifer Hritz | General | Optical Contacting | Controlling hot plate and recording temperature with one Arduino | Previously, we had one Arduino taking the
two thermocouple readings and another, separate
one controlling the PWM of the hot plate. |
|
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126
|
Mon Feb 6 15:36:39 2023 |
Jennifer Hritz | General | Optical Contacting | Papers on making Q measurements of bonds | Upper limits on the mechanical
loss of silicate bonds in a silicon tuning
fork oscillator​ |
|
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125
|
Thu Feb 2 17:28:37 2023 |
Sophia Adams | General | Optical Contacting | Test of Temperature Reading of One Plate |
The arduino was able to read temperature |
|
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124
|
Thu Jan 12 15:36:22 2023 |
Koji | General | General | Crane configuration for the suspension test chamber | I made a quick investigation of the crane
configuration for the suspension test chamber.
Conclusions: |
|
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123
|
Thu Jan 12 11:54:08 2023 |
Koji | General | General | Heavy item transport | [JC, Koji]
Caltech transport came in this
morning. They first went to the OMC lab and |
7x |
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122
|
Thu Jan 12 11:38:26 2023 |
Koji | General | General | How to move the large engine hoist through the narrow door | See the attachments. |
|
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121
|
Tue Jan 10 23:30:25 2023 |
Koji | General | General | Heavy item transport - preparation | [JC, Stephen, Paco, Gabriele, Aidan,
Radhika, Koji]
We have successfully extracted |
|
|
120
|
Mon Jan 9 21:03:53 2023 |
Koji | General | General | Heavy item transport - preparation | 1) Paco cleared the path in the DOPO lab.
We'll need a flat dolly or wooden bars
(covered with a mylar sheet) to place the |
|
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119
|
Mon Jan 9 16:18:50 2023 |
Sophia Adams | General | Optical Contacting | | |
|
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118
|
Sat Jan 7 17:08:47 2023 |
Sophia Adams | General | Optical Contacting | | I am getting started on building the arduino
circuit as well as setting up my computer
so I can communicate between jupyter notebook |
|
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117
|
Sat Jan 7 16:07:13 2023 |
| General | General | | The bond quality measurements can be split
into two categories: destructive and nondestructive.
For destructive, we have measuring tensile |
|
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114
|
Thu Oct 27 22:12:21 2022 |
rana | General | Optical Contacting | plotting and PID | The Arduino / AC PWM interface looks good.
I recommend that you maintain the code in
GitHub and post a link to the repo whenever |
|
|
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 |
|
|
112
|
Wed Oct 26 21:27:23 2022 |
Jennifer | General | Optical Contacting | PWM 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] |
|
|
Draft
|
Tue Oct 25 18:55:38 2022 |
Jennifer Hritz | General | Optical Contacting | PWM 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] |
|
|
110
|
Mon Oct 24 21:23:22 2022 |
Jennifer Hritz | General | Optical Contacting | PWM 3.1 longer off times in cycle | To combat the bottom plate heating up much
faster than the top plate, I decided to try
increasing the cycle period from 1000ms (1s) |
|
|
109
|
Sun Oct 23 21:01:40 2022 |
Jennifer Hritz | General | Optical Contacting | PWM 3.0 (+280°C 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 |
|
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108
|
Sat Oct 22 21:18:56 2022 |
Jennifer Hritz | General | Optical Contacting | PWM v3.0 | With 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 |
|
|
107
|
Fri Oct 21 22:22:37 2022 |
Jennifer Hritz | General | Optical Contacting | PWM v2.6 on new thermocouple set up | I performed the same tests I have been
doing prior (+180°C in 10 minutes)
but now with the (correctly wired) thermocouples |
|
|
106
|
Thu Oct 20 22:43:05 2022 |
Jennifer Hritz | General | Optical Contacting | Wired the thermocouples backwards | Since the two devices are giving different
temperature readings, I would like to find
out if this imprecision is linear (e.g. they |
|
|
105
|
Wed Oct 19 21:51:10 2022 |
Jennifer Hritz | General | Optical Contacting | The trials and tribulations of the thermocouples | I intended to test the new thermocouple
set up today, but when I plugged them in,
both did not read a temperature. It took |
|
|
104
|
Tue Oct 18 19:33:38 2022 |
Jennifer Hritz | General | Optical Contacting | Setting up thermocouples | Firstly, last night's heating did not
change the contacted surface area greatly,
but there is too many factors to speculate |
|
|
103
|
Mon Oct 17 23:17:25 2022 |
Jennifer Hritz | General | Optical Contacting | Testing PWM code with actual samples | Now that I have (relatively) good PWM code,
I wanted to do my first real test with actual
samples. Since everything went smoothly, |
|
|
102
|
Sun Oct 16 14:20:32 2022 |
Jennifer Hritz | General | Optical Contacting | Samples after 2 weeks under pressure | Since 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 |
|
|
101
|
Sat Oct 15 21:59:13 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2.6 Test #1, 2, 3 | I realized that, after changing so much
from v2.3 to 6, I should check that my first
two tests produce correct results with the |
|
|
100
|
Fri Oct 14 21:36:52 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2.6 Test #3 | The 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 |
|
|
99
|
Thu Oct 13 20:56:48 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2.4,5 Test #3 | My two corrections ended up being huge
overshoots. The drop off time (100°C)
is correct, but the default rate increase |
|
|
98
|
Wed Oct 12 23:26:48 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2.3 Test #3 | I tried increasing the temperature by 180°C
over 20 minutes. As suspected, it did not
quite reach the target temperature because |
|
|
97
|
Tue Oct 11 23:59:07 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2.3 Test #1 and 2 | Here are the graphed results from
yesterday's tests, both by themselves
and overlayed with the previous tests. I |
|
|
96
|
Mon Oct 10 15:34:13 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2.1,2,3 Test #1 and v2.3 Test #2 | Before trying the PWM on actual samples,
I wanted to make one final attempt at improving
my code (labled as v2.1). This change |
|
|
95
|
Sun Oct 9 21:55:53 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2 test #1 & 2 | For 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 |
|
|
94
|
Sat Oct 8 23:22:25 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2 test #1 | I had some trouble with the code not working
as intended (partially because it has been
I while since I coded in C++). |
|
|
93
|
Fri Oct 7 21:20:08 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM v2 progress | I 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 |
|
|
92
|
Fri Oct 7 00:21:24 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM Test #3 | The 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 |
|
|
91
|
Wed Oct 5 23:24:08 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM Test #2 | I repeated the first test, but let the
hot plate run longer. It revealed that the
linearity for the lower temperatures completely |
|
|
90
|
Tue Oct 4 22:15:23 2022 |
Jennifer Hritz | General | Optical Contacting | Hot plate PWM Test #1 | I wrote a program to control the heating
rate of the hot plate using Pulse Width Modulation
(PWM), and it was a great success! |
|
|
89
|
Mon Oct 3 23:32:30 2022 |
Jennifer Hritz | General | Optical Contacting | Cause 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 |
|
|
88
|
Sun Oct 2 23:23:07 2022 |
Jennifer Hritz | General | Optical Contacting | Cause of improved bond: time or pressure | Before jumping to conclusions based on
my previous results, I wanted to check that
it was indeed heat and pressure, not time, |
|
|
87
|
Sat Oct 1 23:00:03 2022 |
Jennifer Hritz | General | Optical Contacting | (RESULTS!) Quick test heat and pressure test | These are the results from the previous
log.
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