PURPOSE: To observe infrared radiation.
DESCRIPTION: The output from a commercial thermopile is connected to a digital voltmeter where the voltage is proportional to the temperature observed: the hotter the object the higher the voltage. Use various sources: ice, boiling water, liquid nitrogen, the floor, people, etc. This is only qualitative; the system is not calibrated.
REFERENCES: (PIRA 5E50.10) See Demonstration Reference File for further information. See also Demonstration I2-06: THERMOPILE WITH AUDIO OSCILLATOR.
EQUIPMENT: Thermopile, DVM with TV camera and monitor, heat sources.
SETUP TIME: 5 min.
Go back to Lecture-Demonstration Home Page.