The size of radiation energy of object is related to surface temperature of objects.
Infrared radiation: in nature; all objects with temperature above absolute zero(-273C) with emit infrared radiation to the outside world.
Infrared detector: it’s the device which can convert the change of amount of infrared radiation of measured object into power change; i.e. convert light signals into electrical signals.
Infrared thermal imager will focalize the infrared energy radiated from measured objects to infrared detector by optical devices.
After the infrared data which each pixel on detector receivers are processed; compare the pre-calibrated temperature data; convert them into standard video format and display; thus the process can be achieved that the heat distribution of measured objects is converted into infrared thermal map.
This infrared thermal map corresponds to the thermal distribution on the surface of measured objects.