Physics Lab Equipment

LEOI-63 Blackbody Experimental System

LEOI-63 Blackbody Experimental System

Note: computer not included


  • Record blackbody radiation spectrum under computer control

  • Deduct transfer function of optical components and photoreceivers

  • Quantitative analysis of blackbody radiation spectrum

  • Include Tungsten-Bromine lamp with power supply


LEOI-63 is specifically designed to measure the blackbody radiation energy or the radiation energy of an emission light source. This system can automatically record the radiation spectrum of an emission light source. By varying the color temperature of the light source, the phenomenon as described by Wien's displacement law can be quantitatively analyzed through the recorded radiation spectrum of the light source. This system can be used to precisely verify the Planck's law and Stefan-Boltzmann's law. Based on the Planck's formula, system software can calculate the theoretical radiation spectrum of an absolute blackbody at any given temperature. It can also correct the emissivity coefficient (ε) of a Tungsten-Bromine lamp at various temperatures.

The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.

In addition, the infrared spectrometer can be used as a stand-alone instrument for spectroscopy with the software provided.


Using this system, the following experiment examples can be conducted:


1. Verify the Planck’s law of radiation
2. Verify the Stefan-Boltzmann law
3. Verify the Wien’s Displacement law
4. Study the relationship of radiation intensity between a blackbody and a non-blackbody emitter
5. Learn how to measure the radiation energy curve of a non-blackbody emitter


Wavelength Range 800 nm ~ 2500 nm
Relative ApertureD/F=1/7
Focal Length of Collimation Lens302 mm
Grating300 L/mm
Wavelength Accuracy± 4 nm
Wavelength Repeatability≤ 2 nm

Part List 

Power and Control Unit1

Software CD (Windows 7/8/10, 32/64-Bit PCs)

Power Cord2
Signal Cable3
USB Cable1
Tungsten-Bromine Lamp (LLC-1)1
Color Filter (White and Yellow)1 each

Screenshot LEEB1501.jpg

Spectra: measured vs theoretical

(Click figure to enlarge)

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