The output from a thermopile is connected to a digital voltmeter where the voltage is proportional to the temperature observed: the hotter the object the higher the voltage.
Related Demos
Tips
This is only qualitative; the system is not calibrated.
Voltmeters are in the black toolbox.
Use a small heater as a heat source.
7A10.50 = photoconduction vs. thermopile; photoelectric effect