The main factors that affect the emissivity of infrared thermometer are material, surface finish and thickness of data.
Any object will send out infrared wave at - 273 ℃. As an ideal radiator, blackbody can absorb radiation energy of all wavelengths. Infrared thermometer has no reflection and transmission of energy, and its external emissivity is 1.00. There is no real blackbody in nature, but in order to understand and obtain the distribution law of infrared radiation, it is necessary to select a suitable model in the theoretical research of infrared thermometer. This is the quantized oscillator model of cavity radiation proposed by Planck. Then the law of Planck blackbody radiation is derived. The infrared thermometer is the blackbody spectrum indicated by wavelength Radiance, which is the starting point of all infrared radiation theories, is called blackbody radiation law.
The influence of emissivity of infrared thermometer on radiation temperature measurement: the practical objects in infrared nature are not blackbody. In addition to the radiation wavelength and the temperature of the object, the radiation amount of all practical objects is also related to the material type, preparation method, thermal process of infrared thermometer, external condition and environmental conditions. Therefore, in order to make the rule of blackbody radiation applicable to all practical objects, it is necessary to introduce a share coefficient, i.e. emissivity, which is related to the nature and appearance of the data. The coefficient shows the closeness between the thermal radiation of the practical object and the blackbody radiation, and the value is between zero and the value less than 1. According to the radiation law of Planck blackbody, the infrared radiation characteristics of any object can be known only by knowing the emissivity of the data.
The temperature of the infrared thermometer should be measured in the infrared radiation range first. The ratio of monochromatic infrared thermometer to radiation component in two wavebands, and the ratio of two-color infrared thermometer to radiation in two wavebands.
Calibration time and self calibration procedure of infrared thermometer
Establish the basis for calibration: according to the temperature measurement scale, put a metal material sample in the resistance furnace whose diameter and area are larger than the required diameter of infrared thermometer. The S-type noble metal thermocouple is bound on it, and the thermocouple is used as the reference temperature source. To ensure that the temperature of the temperature source is relatively stable, refer to the expansion of the calibration temperature source, and the uncertainty should not exceed the table.
Calibration method: calibration environmental conditions ambient temperature (18 ~ 25) ℃ refer to the specification. The environmental humidity of electrical measuring equipment operation should meet the corresponding skill requirements.
Relative humidity: > 85%, to prevent strong background radiation and alternating magnetic field.
Supporting facilities: the accuracy (converted into temperature) of S-type thermocouple and its point test equipment used for measuring standard temperature source should be better than one tenth of the allowable error of infrared measuring instrument Zui.
Insulation resistance meter with additional DC voltage of 520v, meter ruler for calibration of temperature source heating furnace.
When starting up, the digital display should be clear and complete, and the button should be normal. If there is a prompt of lack of power, the battery should be replaced before calibration.
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