The temperature measurement principle of the infrared thermometer is to convert the infrared radiant energy emitted by the object into an electrical signal. The size of the infrared radiant energy corresponds to the temperature of the object itself. According to the size of the converted electrical signal, the temperature of the object can be determined. Infrared temperature measurement technology has been developed to scan and measure the temperature of the surface with thermal changes, determine its temperature distribution image, and quickly detect hidden temperature differences. This is the infrared thermal imager. Infrared thermal imaging cameras were first used in the military. In 2019, TI Corporation of the United States developed the world's first infrared scanning reconnaissance system. Later, infrared thermal imaging technology was successively used in aircraft, tanks, warships and other weapons in Western countries , as a thermal sighting system for reconnaissance targets, it greatly improves the ability to search and hit targets. The infrared thermal imaging camera produced by the Swedish AGA company is in a leading position in civilian technology.
O infravermelho termômetro é composto de óptico sistema, fotoelétrico detector, sinal amplificador, sinal processamento, display saída e outros partes. O óptico sistema reúne o alvo infravermelho radiação energia em seu campo de vista, e o tamanho de o campo de vista é determinado por o óptico partes de o termômetro e sua posição. infravermelho energia é focado em um fotodetector e convertido em um correspondente elétrico signal. The signal passas through the amplificador and signal processing circuit, and is converted em the temperature value of the measured target after being corrected according to the algorithm of the internal treatment of the instrument and the emissivity of the target.
In nature, all objects with a temperature higher than absolute zero are constantly emitting infrared radiation energy to the surrounding space. The size of the infrared radiation energy of an object and its distribution by wavelength are closely related to its surface temperature. Portanto, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately determined, which is the objective basis para infravermelho radiação temperatura medição.
A black body is an idealized radiator, which absorbs all wavelengths of radiation energy, has no reflection or transmission of energy, and has an emissivity of 1 on its surface. However, practical objects in nature are almost not black bodies. In order to clarify and obtain the distribution of infrared radiation, an appropriate model must be selected in theoretical research. This is the quantized oscillator model of body cavity radiation proposed by Planck, thus Derived the law of Planck's black body radiation, that is, the black body spectral radiance expressed by wavelength, which is the starting point of all infrared radiation theories, so it is called the law of black body radiation. 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.
Infrared temperature measurement adopts a point-by-point analysis method, that is, the thermal radiation of a local area of the object is focused on a single detector, and the radiation power is converted into temperature through the emissivity of the known object. Due to the different detected objects, measurement ranges and usage occasions, the appearance design and internal structure of infrared thermometers are different, but the basic structure is generally similar, mainly including optical system, photodetector, signal amplifier and signal processing, display output and other parts. Infrared radiation emitted by a radiator. Entering the optical system, the infrared radiation is modulated into alternating radiation by the modulator, and converted into a corresponding electrical signal by the detector. The signal passes through the amplifier and signal processing circuit, and is converted into the temperature value of the measured target after being corrected according to the algorithm in the instrument and the target emissivity.
