How to adjust the emissivity of infrared thermometer
Infrared radiance = emissivity - reflectivity
The reflectivity is inversely proportional to the emissivity, the stronger the object's ability to reflect infrared radiation, the weaker its own infrared radiation ability. Usually the visual method can be used to roughly judge the reflectivity of the object. The reflectivity of new copper is higher and the emissivity is lower (0.07-0.2), and the reflectivity of oxidized copper is lower and the emissivity is higher (0.6-0.7). ), the reflectance of copper blackened by heavy oxidation is even lower, and the emissivity is correspondingly higher (0.88). The vast majority of painted surfaces have very high emissivity (0.9-0.95) and negligible reflectance.
For most infrared thermometers, the only thing that needs to be set is the rated emissivity of the material to be measured. This value is usually preset to 0.95, which is sufficient for measuring organic materials or painted surfaces.
By adjusting the emissivity of the thermometer, the problem of insufficient infrared radiation energy on the surface of some materials, especially metal materials, can be compensated. The influence of reflectivity on the measurement only needs to be considered when there is a source of high-temperature infrared radiation near the surface of the measured object and reflects it.
Application of non-contact thermometer in steel processing and manufacturing
1. Application in continuous casting: monitor temperature to maintain proper metallurgical properties, increase product productivity, improve product quality, and extend equipment life
2. Application in rod/wire rolling: use infrared thermometer to control proper cooling to ensure correct metallurgical properties
3. Application in cold/hot rolling: automatic setting of rolling mill equipment through infrared thermometer, real-time temperature measurement and bracket adjustment. This ensures that the brackets are set properly to match the temperature of the steel
4. Application in heat treatment: Use an infrared thermometer to continuously measure the entire temperature and heater efficiency of the heater to save fuel and improve product quality
