What are the factors affecting the emissivity of infrared thermometers
Any object at -273 ℃ will emit infrared waves. As an idealized radiator, a blackbody can absorb radiation energy of all wavelengths. Infrared thermometers do not reflect or transmit energy, and their emissivity is 1.00. There is no real blackbody in nature, but in order to understand and obtain the scattering law of infrared radiation, it is necessary to choose a suitable model for infrared thermometers in theoretical research. This is the quantized oscillator model of body cavity radiation proposed by Planck for infrared thermometers. Later, the law of Planck blackbody radiation was derived, and infrared thermometers represent the spectral radiance of blackbody in wavelength. This is the starting point of all infrared radiation theories, hence the name blackbody radiation law.
The influence of emissivity of infrared thermometers on radiation temperature measurement: The practical objects that exist in nature with infrared radiation are not blackbodies. The radiation level of all practical objects depends not only on the radiation wavelength and temperature of the object, but also on the types of materials that make up the object, preparation methods, thermal processes of infrared thermometers, as well as external conditions and environmental conditions. Therefore, in order to make the blackbody radiation law applicable to all practical objects, it is necessary for infrared thermometers to introduce a share coefficient related to the data properties and external conditions, namely emissivity. This coefficient indicates the proximity between the thermal radiation of a practical object and blackbody radiation, with values between zero and values less than 1. According to the infrared Planck blackbody radiation law, as long as the emissivity of the data is known, the infrared radiation characteristics of any object can be determined.
When measuring the temperature of a policy using an infrared radiation thermometer, the first step is to measure the infrared radiation of the policy within its wavelength range, and then the temperature of the tested policy is calculated by the infrared thermometer. Monochromatic infrared thermometer and the composition of radiation within the frequency band; The ratio of the radiation of two bands to the two-color infrared thermometer.
