Question

Given a thermocouple, determine the plot of the seebeck voltage if we know the thermocouple is composed of copper constantan (a=38.7 μV/C, b=0.082 μV/C2) from 0 to 50 degrees celsius, knowing that the reference temperature is 0 degrees celsius. Does the Peltier or Thomson effect dominate the plot? What is the sensitivity of this thermocouple sensor at 30 degrees celsius?

Answer 1

Answer :

Given that:

Determine the plot of the seebeck voltage if we know the thermocouple is composed of copper constantan (a=38.7 μV/C, b=0.082 μV/C2) from 0 to 50 degrees celsius, knowing that the reference temperature is 0 degrees celsius.

Effective seeback coefficient of copper constant

with  

effective coefficient = a-b

=38.7-0.082

The peltier is the reverse phenonmenon of the seedback dffect The electric current flowing throught the junction connecting two material will emits or absorb heat per unit time at the junction to balance the diffrence in chemical potetial of the two material.

The electronic refrigeratoe can be made which is known as pethier cooler.

And similarly to seebeck coefficient the pettier coefficient ids defined as the coefficient of the thermal current (Q) to the electric current (I)

Thus peltier or thomson effect does not dominate plot.

sensitivity of thermo couple sensor at 30 0 c

is sensitivity

sensitivity