# Thermocouple find voltage vs. temperature

12 vues (au cours des 30 derniers jours)
Joy le 26 Avr 2021
Modifié(e) : Joy le 28 Avr 2021
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
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)
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### Réponse acceptée

Clayton Gotberg le 26 Avr 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.
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Clayton Gotberg le 28 Avr 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 le 28 Avr 2021
Thank you so much for your help!

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