Kako je termometar korišteno in toplo valjanje?
1. Osnovni principi
All objekti with a temperatura viši than zero are constant emitting infracrven radiation energy to the surrounding space. Infracrveno zračenje karakteristike of an objekt: the size of the radiation energy and its distribution accord to wavelength have a very close relationship with its surface temperature. Stoga, by measure the infrared energy radiated by the object itself, its surface temperature can be točno određeno, which is the objective basis for infracrveno zračenje temperatura mjerenje.
Infrared thermometer, also known as infrared radiation temperature measurement, is a technology that uses the infrared radiation emitted by the object itself to measure the temperature of an object. Infrared radiation or infrared radiation is electromagnetic radiation with a wavelength between 0.76 μm and 1000 μm. For an ideal black body, the total radiation power of all wavelengths emitted per unit surface area to the hemispherical space (abbreviated as total radiation or radiation intensity) is 4 times the temperature of the object. Proportional to the power:
Mb(T)=σT4(1)
This is the Stephen-Boltzmann law. Among them, σ=5.6697×10-8W/m2K4 is called Stephen-Boltzmann constant.
Equation (1) is used for real objects and needs to be multiplied by the emissivity:
Mgb(T)=εσT4
It can be seen that the spontane emission intensity Mgb(T) of any object is related to the temperature of the object and the emissivity of the object. The emissivity ε of an object is direkt related to its material properties (sastav, metal i nemetal, kristal i amorfni, itd.) , surface state (glatko i grubo površina, stupanj oksidacija, zagađenje ili površina premaz, itd.) and the temperature of the object. As long as the emissivity of the object can be selected right, the actual temperature of the measured object can be točno dobiveno.
Infracrven termometar is skladan of tri dijelova: optički sustav, detection unit and signal obrada. The main function of the optical system is to collect the radiation power of the the measured target and make it converge on the infrared detector. The function of the infrared detektor is to convert the primljen infracrveno zračenje into električno signal izlaz.
