Como é o termômetro usado em quente rolagem?
1. Basic principles
All objects with a temperature higher than zero are constantly emitting infrared radiation energy to the surrounding space. Infrared radiation characteristics of an object: the size of the radiation energy and its distribution according to the wavelength have a very close relationship with its surface temperature. Portanto, por medição o infravermelho energia irradiado por o objeto si, s superfície temperatura pode ser precisamente determinado, que é o objetivo base para infravermelho radiação temperatura medição.
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.
Equação (1) é usado para real objetos e necessidades para ser multiplicado por a emissividade:
Mgb(T)=εσT4
It can be seen that the spontaneous 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 directly related to its material properties (composition, metal and non-metal, crystal and amorphous, etc.), surface state (smooth and rough surface, degree of oxidation, pollution or surface coating, etc.) and the temperature of the object. As long as the emissivity of the object can be selected correctly, the actual temperature of the measured object can be accurately obtained.
Infravermelho termômetro é composto de três partes: óptico sistema, detecção unidade e sinal processamento. O principal função de o óptico sistema é para coletar a radiação potência de o medido alvo e fazer ele converge no infravermelho detector. A função de o infravermelho detector é para converter o recebido infravermelho radiação em elétrico sinal saída.
