Infrared polarization imaging is a new kind of infrared detection technology developed in recent ten years. Different
from the traditional detection method of infrared imaging, infrared polarization imaging can not only obtain infrared
radiation intensity information of targets, but also obtain the infrared radiation polarization information. So the
polarization of the target scene is the physical basis of infrared polarization imaging detection.
On the basis of the research about infrared polarization imaging theory, the characteristics of long-wave infrared
polarization detection was analyzed in this paper. Firstly, the paper studied long-wave infrared polarization state and
interaction effect which coming from the spontaneous emission of target and environment, then designed the analysis
experiment about long-wave infrared polarization characteristics that coming from spontaneous radiation, further and
verified the forming mechanism of long wave infrared polarization. Through the several experiments that the long wave
polarization information of different material objects being measured, a physical phenomenon was found that with the
long-wave thermal radiation transmitting form high temperature object to low temperature object, the polarization
characteristics transfer process had been happened at the same time, and the degree of this transfer was associated with
the material and self-temperature of the objects.