Thermocouple find voltage vs. temperature

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Array=csvread('ambient.csv');
x1=Array(:,1);
y1=Array(:,2);
nexttile
plot(x1,y1)
title('Voltage vs. Time of Ambient');
xlabel('Time');
ylabel('Voltage');
%Find mean
time=Array(:,1);
meanta=mean(time)
voltage=Array(:,2);
meanva=mean(voltage)
hold on
%icewater
Array2=csvread('icewater.csv');
x2=Array2(:,1);
y2=Array2(:,2);
nexttile
plot(x2,y2)
title('Voltage vs. Time of Ice Water');
xlabel('Time');
ylabel('Voltage');
hold on
%Find mean
time1=Array2(:,1);
meanti=mean(time1)
voltage1=Array2(:,2);
meanvi=mean(voltage1)

Accepted Answer

Clayton Gotberg
Clayton Gotberg on 26 Apr 2021
You're trying to make a calibration curve for your thermocouple, so you should know the temperature at two calibration points. Did your lab test the voltage at two known temperatures? Often, students measure the voltage of a thermocouple when it is inserted into boiling water and melting water (mixed water and ice).
If you know the voltage and temperature for two points, you can figure out how much the voltage changes when the temperature changes (the sensitivity). For example, if I read 10.5 volts when the thermocouple is in the freezing water and 0.5 volts when the thermocouple is in the hot water, I know that the voltage decreases 10 V over 100°C, meaning that the voltage changes by -0.1V/°C. Now, if I measure 5.5 V from the thermocouple, I can relate that to 50°C.
  7 Comments
Clayton Gotberg
Clayton Gotberg on 28 Apr 2021
My best guess is that your lab requirements include both the calibration curve and the results curves, but I'm not in your course so I really can't be sure about why it's being requested.
For text, check out both the text function built in to MATLAB and the labelpoints package on the File Exchange!
Joy
Joy on 28 Apr 2021
Thank you so much for your help!

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