Abstract: An experimental platform about thermal radiation is designed in this paper. Three basic principles of thermal radiation, including inverse square law of radiation, Stefan-Boltzmann radiation law and Lambert cosine law, are studied quantitatively. The results obtained agree with the theory well. The Kirchhoffs law is also studied qualitatively and it demonstrates the positive relativity between radiating capacity and absorbing capacity.

Key words: thermal radiation, radiant exit, radiation law, infrared temperature measurement