What are the factors that affect the emissivity of infrared thermometers
Any object at -273°C will emit infrared waves. As an idealized radiator, a black body can absorb radiation energy of all wavelengths. Infrared thermometers have no energy reflection and transmission, and their surface emissivity is 1.00. Originally, there is no real black body in nature, but in order to understand and obtain the law of infrared radiation distribution, it is necessary to choose an appropriate model for infrared thermometers in theoretical research, which is the body cavity radiation proposed by the infrared thermometer Planck Quantize the oscillator model, and then derive the law of Planck's black body radiation. The infrared thermometer is the black body spectral radiance expressed by wavelength. This is the starting point of all infrared radiation theories, so it is called the black body radiation law.
The influence of infrared thermometer object emissivity on radiation temperature measurement: The actual objects existing in the infrared nature are almost not black bodies. The radiation amount of all actual objects depends not only on the radiation wavelength and the temperature of the object, but also on the type of material constituting the object, the preparation method, the thermal process of the infrared thermometer, and the surface and environmental conditions. Therefore, in order to make the law of black body radiation applicable to all actual objects, the infrared thermometer must introduce a proportional coefficient related to the material properties and surface conditions, that is, the emissivity. This coefficient indicates how close the thermal radiation of the actual object is to the black body radiation, and its value is between zero and a value less than 1. According to the radiation law of infrared Planck black body radiation, as long as the emissivity of the material is known, the infrared radiation characteristics of any object can be known.
Infrared radiation infrared thermometer measures the temperature of the target first to measure the infrared radiation of the target within its band range, and then calculate the temperature of the measured target by the infrared thermometer. The single-color infrared thermometer is proportional to the radiation in the band; the two-color infrared thermometer is proportional to the ratio of the radiation in the two bands.
