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When we need to quantify the effect of infrared radiation, we need to measure the temperature of infrared radiation. In this case, we need to use an infrared thermometer. Different materials, the performance of the infrared radiation is also different. Before reading the temperature using an infrared thermometer, we must first understand the basic principles of infrared radiation measurement and the specific infrared radiation characteristics of the measured material.
Infrared emissivity = absorptivity + reflectivity + transmittance Whatever infrared radiation, it will be absorbed once it is emitted, so absorptivity = emissivity. The infrared thermometer reads exactly the infrared radiation energy emitted by the surface of the object. The infrared radiation meter cannot read the infrared radiation energy lost in the air. Therefore, in the actual measurement work, we can ignore the transmission rate, so we get a Basic infrared radiation measurement formula:
Infrared emissivity = emissivity - reflectivity Reflectivity is inversely proportional to the emissivity. The stronger the ability of an object to reflect infrared radiation, the weaker its own ability to infra-red radiation. Generally, the method of visual inspection can roughly determine the reflectivity of the object. The new copper has a higher reflectivity and a lower emissivity (0.07-0.2). The oxidized copper has a lower reflectivity and a higher emissivity (0.6-0.7). The reflectance of blackened copper due to heavy oxidation is even lower, and the emissivity is correspondingly higher (0.88). The surface emissivity of most painted surfaces is very high (0.9-0.95), and the reflectance is negligible.
For most infrared thermometers, the only thing that needs to be set is the rated emissivity of the material under test, which is usually preset to 0.95, which is sufficient for measuring organic materials or painted surfaces.
By adjusting the emissivity of the pyrometer, the problem of insufficient infrared radiation energy on the surface of some materials can be compensated, in particular metal materials. The influence of reflectance on the measurement needs to be taken into consideration only when the high-temperature infrared radiation source is present and reflected near the surface of the measured object.
Schedule: emissivity of some substances (for reference only) 
How to adjust the infrared thermometer emissivity
Infrared radiation is everywhere and never stops. The greater the temperature difference between objects, the more obvious the radiation phenomenon. The vacuum can transmit the infrared radiation energy emitted by the sun to the earth through 93 million miles of time and space. It is absorbed by us and brings us warmth. When we stood in front of a food cooler in the mall, the heat of infrared radiation emitted by our body was absorbed by the refrigerated food, making us feel very cool. In both cases, the radiation effects are very obvious. We can clearly feel the changes and feel its existence.