Taisyklės infraraudonųjų spindulių termometrai
In nature, when the temperature of any object is higher than zero, it will continuously emit infrared radiation energy to the surround space, and the size and distribution of the radiation energy are related to the surface temperature of the object. Todėl, we can measure the radiation of the object Infrared energy to determine the temperature of its surface. This is the objective basis on which infrared radiation temperature matavimas is pagrįstas.
Let's look at one more law about infraraudonųjų spindulių termometrai.
Black body radiation law: A black body is an idealized radiator, which absorbs radiation energy of all wavelengths, has no reflection and transmission of energy, and has an emissivity of 1 on its surface. It should be pointed out that there is no real black body in nature, but in order to clarify and obtain the distribution law of infrared radiation, an appropriate model must be selected in theoretical research, which is the quantized oscillator model of body cavity radiation proposed by Planck, thus deriving Planck's law of black body radiation, that is, the black body spectral radiance represented by wavelength, is the starting point of all infrared radiation theories, so it is called the law of black body radiation.
The influence of object emissivity on radiation temperature measurement: the actual objects existing in 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, the surface state and the environmental conditions. Therefore, in order to make the law of black body radiation applicable to all practical objects, a proportional coefficient related to material properties and surface states must be introduced, that is, 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 law of radiation, as long as the emissivity of the material is known, the infrared radiation characteristics of any object are known. The main factors affecting emissivity are: material type, surface roughness, physical and chemical structure, and material thickness.
Kai naudojimas an infraraudonųjų spindulių termometras matas matas temperatūra iš a taikinys, it is pirmas būtinas matas kiekis iš infraraudonųjų spindulių iš the target in its band range, and then the temperature of the measured target is calculated by the thermometer. A monochromatic pyrometras is proporcingas to the amount of radiation in a band; a two-color pyrometer is proportional to the ratio of the amount of radiation in the two Juostų.
