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Wed Jan 24 13:55:04 2018, Kira, Summary, PEM, Seismometer can insulation test 6x
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Thu Jan 25 12:41:18 2018, Kira, Update, PEM, Seismometer can insulation test
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Thu Jan 25 14:58:20 2018, Kira, Update, PEM, Seismometer can insulation test
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Thu Jan 25 16:39:09 2018, Kira, Update, PEM, Seismometer can insulation test
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Thu Feb 1 16:09:13 2018, Kira, Update, PEM, Seismometer can insulation test
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Mon Feb 5 12:12:41 2018, Kira, Update, PEM, Seismometer can insulation test
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Wed Feb 7 12:35:56 2018, Kira, Update, PEM, Seismometer can insulation test
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Wed Feb 7 17:01:25 2018, gautam, Update, PEM, PID test plan    
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Wed Feb 7 19:14:19 2018, rana, Update, PEM, PID test plan
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Thu Feb 8 12:24:37 2018, Kira, Update, PEM, PID test plan
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Thu Feb 8 17:32:44 2018, Kira, Update, PEM, PID test plan   
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Fri Feb 9 15:29:32 2018, Kira, Update, PEM, PID test plan
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Thu Feb 15 16:03:57 2018, Kira, Update, PEM, PID test plan
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Thu Feb 22 16:16:43 2018, Kira, Update, PEM, temp sensor input
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Mon Feb 26 16:22:10 2018, Kira, Update, PEM, temp sensor input  
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Wed Feb 28 12:31:28 2018, Kira, Update, PEM, temp sensor input
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Fri Mar 9 12:59:53 2018, Kira, Update, PEM, ADC noise measurement 
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Mon Mar 26 16:10:33 2018, Kira, Update, PEM, final setup sketch   
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Wed Apr 18 12:18:39 2018, Kira, Update, PEM, final setup sketch 7x
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Wed Apr 18 16:59:35 2018, rana, Update, PEM, final setup sketch: EX Seis
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Thu Apr 19 11:29:11 2018, rana, Update, PEM, PID tune
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Mon Apr 23 20:06:35 2018, rana, Update, PEM, PID tune
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Thu Apr 26 19:46:26 2018, rana, Update, PEM, PID Quixote
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Tue May 1 11:15:19 2018, Kira, Update, PEM, PID Quixote
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Tue May 1 15:23:18 2018, Kira, Update, PEM, new ADC channel setup issue
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Thu Apr 19 12:23:30 2018, Kira, Update, PEM, final setup sketch update 
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Thu Apr 19 18:23:51 2018, Kira, Update, PEM, final setup sketch update
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Fri Apr 20 15:07:45 2018, Kira, Update, PEM, final setup sketch update
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Thu May 24 16:08:12 2018, Kira, Update, PEM, parts list
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Tue May 29 16:22:43 2018, Kira, Update, PEM, parts list  
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Wed Jun 6 15:12:29 2018, Kira, Update, PEM, parts from lab  
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Mon Jun 18 11:12:23 2018, Kira, Summary, PEM, finishing up work at the lab  
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Tue Apr 24 09:10:20 2018, Kira, Update, PEM, final setup sketch
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Mon Apr 30 15:36:18 2018, Kira, Update, PEM, final setup sketch
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Tue May 8 10:24:10 2018, Kira, Summary, PEM, plan for this week
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Fri May 11 11:47:33 2018, johannes, Summary, PEM, Acromag issues
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Tue May 15 15:13:23 2018, Kira, Summary, PEM, Acromag issues
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Thu Mar 15 17:33:56 2018, Kira, Update, PEM, test setup
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Tue Mar 20 16:56:01 2018, Kira, Update, PEM, test setup 
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Tue Mar 20 19:48:10 2018, gautam, Update, PEM, test setup
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Fri Mar 23 12:00:20 2018, rana, Update, PEM, test setup
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Fri Mar 23 12:45:08 2018, Kira, Update, PEM, test setup
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Thu May 17 15:38:19 2018, Kira, Update, PEM, test setup with seismometer   
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Fri May 18 14:33:34 2018, Kira, Update, PEM, test setup with seismometer
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Mon May 21 14:17:28 2018, Kira, Update, PEM, test setup with seismometer
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Tue May 22 14:49:03 2018, Kira, Update, PEM, test setup with seismometer
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Wed May 23 14:50:33 2018, Kira, Update, PEM, test setup with seismometer 
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Thu May 24 15:18:12 2018, Kira, Update, PEM, PID loop restarted
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Thu May 31 15:48:16 2018, Kira, Update, PEM, running PID script with seismometer
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Mon May 21 10:15:35 2018, gautam, Update, PEM, test setup with seismometer
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Wed Feb 28 21:14:34 2018, gautam, Summary, PEM, Channel admin
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Tue Mar 27 11:11:16 2018, Kira, Update, PEM, Channel setup
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Thu Mar 29 17:14:42 2018, Kira, Update, PEM, PID test
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Fri Mar 30 06:16:45 2018, rana, Update, PEM, PID test
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Fri Mar 30 16:10:46 2018, Kira, Update, PEM, PID test
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Wed Apr 4 16:23:10 2018, Kira, Update, PEM, PID test  
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Fri Apr 6 16:17:20 2018, Kira, Update, PEM, PID tuning
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Fri Apr 6 18:28:57 2018, rana, Update, PEM, PID tuning
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Mon Apr 9 16:30:21 2018, Kira, Update, PEM, MEDM setup
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Tue Apr 10 15:42:08 2018, Kira, Update, PEM, MEDM setup
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Thu Apr 12 10:15:33 2018, Kira, Update, PEM, MEDM setup
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Fri Apr 13 00:20:46 2018, rana, Update, PEM, MEDM setup
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Message ID: 13605
Entry time: Mon Feb 5 12:12:41 2018
In reply to: 13598
Reply to this: 13614
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Author: |
Kira |
Type: |
Update |
Category: |
PEM |
Subject: |
Seismometer can insulation test |
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Attached the program I used to create the plot
Quote: |
After taking the measurements, calibrating them (approximately), and filterting them, I created the following plot. The exponential fit is quite good, as the error is not more than 0.03 C. I used the python function curve_fit in order to get this, and it gave me the time constant as well, which came out to 0.357 hr. From my previous calculations here, I plugged in the values we have (m = 12.2 kg, c = 500 J/kg*k, d = 0.0762 m, k = 0.26 W/(m^2*K), A = 1 m^2), and got that

This is a bit off, but it's probably due to the parameters not being exactly what I supposed them to be, and heat losses through the bottom of the can.
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from scipy.optimize import curve_fit
from scipy.signal import decimate
import cdsutils as cds
import numpy as np
import matplotlib.pyplot as plt
#extract data
channel = ['C1:PEM-SEIS_EX_TEMP_OUT_DQ']
tstart = 1200962230
tend = 1201041084
... 49 more lines ...
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