The principle of a two-color pyrometer, also known as a colorimetric pyrometer, is to use the ratio of the infrared radiation energy of the two bands of adjacent channels to determine the temperature. It can be widely used in smelting, casting, steel rolling, forging, powder metallurgy, chemical industry, glass processing, ceramics, medium frequency induction heating, welding and other industries.

It uses the ratio of the infrared radiation energy of the two bands of the adjacent channel to determine the size of the temperature. The relationship between the ratio and temperature is linear, which is determined by the performance of the detector.

The two-color thermometer can eliminate the influence of water vapor, dust, size change of the detection target, partial occlusion, emissivity change, etc. The two-color pyrometer does not need to correct the two-color coefficient when measuring the vast majority of gray body materials. The average of the highest temperature in the area. The two-color infrared pyrometer can overcome the influence of serious water vapor, dust, size change of detection target, partial occlusion, change of emissivity, etc. Even if the detection signal is attenuated by 95%, it will not have any effect on the temperature measurement result. The software and hardware design are suitable for reliable detection of one million times the dynamic range of the signal, and meet the user's requirements for the accuracy and resolution of the instrument.