Infrared thermometer is made up of RF connector ptical system, optoelectronic detector, signal amplifier, signal processing, display and output parts, etc. Optical system convergence within its field of view of target infrared radiation energy, the size of the field by the thermometer optical components and their locations. Infrared energy focusing on the photodetector is converted into corresponding electrical signals. The signal after amplifier and signal processing circuit, and according to the instrument in the treatment of algorithm and the target emissivity correction after into GPS antenna the target temperature being measured.
In nature, all objects of temperature above absolute zero energy constantly emit infrared radiation into the surrounding space. Object and according to the size of the wavelength of infrared radiation energy of distribution - and its surface temperature has a very close relationship. Therefore, through the measurement of objects radiation of infrared energy, can accurately measure the surface temperature, which is the objective which is the basis of the infrared radiation temperature measurement basis. Blackbody radiator is an idealized, it absorbs all the wavelengths of radiation energy, no energy reflection and, through its surface emissivity is 1. Existing in the nature of real objects, however, almost is not bold, to detect and obtain the infrared radiation distribution, must choose the right model in the theory study, this is the Planck quantization of the coelomic cavity radiation oscillator model is put forward, so as to export the Planck's blackbody radiation law, i.e., according to the wavelength of blackbody radiation spectrum, it is the starting point of all the infrared radiation theory, therefore calls the blackbody radiation law. All the wavelength of the radiation in addition to the actual object depends on the radiation and the temperature of the object, and constitutes a material object types, preparation methods and thermal process and related factors such as surface state and environmental conditions. Therefore, in order to make the blackbody radiation law applies to all real objects, must introduce a related to material properties and surface state of the proportional coefficient, the emission rate. The coefficient according to the actual object heat radiation and proximity of blackbody radiation, its value between zero and less than 1. According to the law of radiation, as long as know emissivity of the material, will know that the infrared radiation characteristics of any object. The main factors influencing the emission rate in: material, surface roughness, the physical and chemical structure and the material thickness, etc.
When using infrared radiation thermometer when measuring the temperature of the target first to measure the goal in the wavelength range of the infrared radiation, then measured the temperature of the target is calculated from RF cable assembly hermometer. Monochrome thermometer and wavelengths of radiation is proportional to the; Two-color thermometer and the ratio of the two wavelengths of radiation is proportional to the.
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