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Thermodynamics – Radiation
Thermal Radiation Laboratory
TD-8855
Why are car radiators
black?
Radiation Cans
TD-8570A
With the Radiation Sensor, a versatile Radiation Cube and the Stefan-Boltzman Lamp,
four key experiments in thermal radiation can be performed.
Students begin with a study of thermal radiation from different types of surfaces at the
same temperature. The Thermal Radiation Cube has four different surfaces which can be
monitored (black matte, white matte, polished aluminum and dull aluminum). The cube is
heated electrically with a 100-watt bulb (its output can be varied). The thick aluminum walls
assure the same temperature on all four walls to within a fraction of a degree. The Radiation
Sensor provides an accurate measure of thermal radiation throughout the infrared region.
Its output is a voltage that is proportional to the intensity of radiation.
Another important introductory experiment is the Inverse Square Law. The Stefan-Boltzman
Lamp uses a special bulb to provide a near-perfect point source, providing accurate results.
Finally, students can verify the Stefan-Boltzman Law for both low and
high temperatures using the Radiation Cube for the low temperatures and
the Stefan-Boltzman Lamp for the high temperatures.
(Temperature probes not included)
Typical
Experiments
With Teacher’s Guide and Sample Data.
1. Introduction to Thermal Radiation
2. Stefan-Boltzman Law at Low
Temperatures. (Rrad = σT 4 )
3. Inverse Square Law
4. Stefan-Boltzman Law at High
Temperatures
Includes
Thermal Radiation Cube (TD-8554A)
Stefan-Boltzman Lamp (TD-8555)
Radiation Sensor (TD-8553)
Order Information:
Thermal Radiation
Laboratory................................................TD-8855
Required:
Basic Digital
Multimeter ...............................................SE-9786A
Power Supply ........................................SF-9584B
The Black, White,
and Silver Radiation
Cans are filled with
hot water, and
allowed to cool.
Order Information:
Radiation Cans
(set of 3) .................................TD-8570A
Quad Temperature
Sensor .....................................PS-2143 p. 70
Temperature
Probe ........................................PS-2153
PASPORT Interface ........................................p. 4
80
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