Study On Terahertz Radiation Test Of Blackbody

Blackbody radiation principle was the study element of detection for target radiation. Research on the test device of blackbody terahertz radiation due to terahertz photon energy was very lower than infrared energy and achieve a high signal to noise ratio test for THz blackbody radiation. First calculate the radiance of low temperature blackbody in the terahertz band. Radiation power from blackbody in the terahertz detector photosensitive surface was calculated in Cassegrain system. Second, blackbody terahertz radiation testing device was developed. The blackbody radiation was modulated by chopper and become square wave of a specific frequency, the detector output cycle signal was received by lock in amplifier in order to improve the radiation signal to noise ratio. Tsurupica material lenses and filters are used for removing the blackbody infrared radiation signals. Vacuum reduced background cryogenic channel was used to eliminate background radiation interference signals. Experimental results show the blackbody terahertz radiation testing device can successfully achieve radiation test of blackbody in temperature range (223 similar to 323) K.