KIT OF BLACK BODY RADIATION.
KIT OF BLACK BODY RADIATION The kit for studying radiation includes a radiometer, Leslie’s
cube and a Stefan-Boltzmann lamp.
This kit will enable students to measure the radiation of a black
body from sources with a wide range of temperatures.
Leslie’s cube can be used as source of black body radiation up
to 120°C, whereas the different faces of the same cube will
enable to study emissivity. Stefan-Boltzmann lamp can be used
to study black body radiation from 3000 to 3500 K.
Instrument used to measure the energy of a beam of radiations
The detector is a thermopile consisting of a set of thermocouples
connected in series. This thermopile is installed inside a housing
of aluminium to keep temperature stability.
An additional shutter mounted on the housing cuts the input
radiation when the zero line of amplifier is adjusted.
This detector has a fl at spectral response of 0.3 μm in ultraviolet
band, and of 15 μm in infrared band. The detection area is of
approximately 2 mm2 and it is small enough to measure the
energy in a laser beam.
For wide radiation sources, the instrument is sensitive in a
cone-shaped angle of 60°.
• Detector: a thermopile with 14 junctions
• Spectral range: 0.3 to 15 μm
• Sensitivity: 1000 W/m2 – 1 W/m2 on 4 ranges
• Controls: change of range, zero adjustment, detector
• Dimensions: 12 (h) x 9.5 (w) x 22.5 cm (d)
It has been designed to study thermal radiation versus
temperature and surface; it consists of a cube of brass with
white and black sides and sides of matt and polished metal.
The thermal emittance of sides varies from the dark part to the
polished metal according to a factor of 20. A pipe for inserting
a thermometer is available on the top of the cube. Filling the
cube with warm tap water will enable to measure the radiation
on the radiometer.
• Dimensions: cube of 7.5 cm
• Material: brass
• Sides: black side, white side matt brass, polished brass
• Alcohol thermometer: 0° to 120°C
It is used to measure radiation versus temperature.
This tungsten lamp is a radiation source that enables to
measure the energy radiated versus temperature. This ratio is
the well-known Stefan-Boltzmann law of radiation.
Starting from the current crossing the lamp and from the
voltage across it, students will be able to calculate the
resistance of fi lament. Then, starting from the variation of
fi lament resistance, they can also determine temperature.
The equipment also includes a low-voltage power supply unit
0 – 20 V, 0 – 5 A.