Bath-type large-area blackbody radiation source (400 mm × 400 mm)

The definition of a blackbody:an object that can absorb all external radiation energy and radiate all of its own energy.

The main technical indicators of blackbody: emissivity of blackbody, diameter of blackbody cavity, temperature uniformity and uncertainty of radiation temperature. Therefore, in order to ensure the product quality of blackbody, blackbody is usually designed according to temperature segments. Usually, the blackbody we refer to are artificial black body. The emissivity of artificial blackbody is close to 1, but not equal to 1.

The main function of a blackbody is to produce standard radiation at a certain temperature. Therefore, it is mainly used to calibrate various radiation thermometers in temperature measurement, such as optical pyrometers, infrared thermometers, infrared thermal imagers, etc.

Blackbodies are mainly used in the field of temperature measurement in industry, and the main product is black body furnace. The comparison method is usually used for the calibration and verification of radiation thermometers, that is, through a high-stability radiation source (usually a black body radiation source) and other supporting equipment, the temperature reproduced by the standard instrument is compared with the temperature reproduced by the radiation thermometer under test to determine whether it is qualified or give a calibration result.