Object surface emissivity field calibration method

Abstract

The invention discloses an object surface emissivity field calibration method. The actual temperature value of a paint coating is measured through a platinum resistor patch, emissivity is calibrated, so that the platinum resistor patch serves as a calibration target; the calibration target is closely attached to a filed calibration object, temperature of local surface of the field calibration object with the calibration target as the center is measured through a thermal infrared imager, and the temperature of the surface of the field object and temperature data of the paint coating on the calibration target are obtained; the value of the surface emissivity of the field object is calculated according to the temperature of the surface of the field object and the temperature data of the paint coating on the calibration target, and field calibration is performed on the surface emissivity of the field object. According to the method, the temperature of the field calibration object is measured through a thermodetector, temperature measuring speed and accuracy are high, and the surface of the field calibration object and the calibration target are in the same plane so that background factors and system noise can have the same influence on the field calibration object and the calibration target; the method is suitable for emissivity calibration of the surface of the field object, and calibration equipment is convenient to carry.

Description

technical field [0001] The invention relates to a method for emissivity measurement, in particular to an on-site calibration method for the emissivity of an object surface. Background technique [0002] 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 according to the wavelength have a very close relationship with its surface temperature. Therefore, by measuring the infrared energy radiated by the object itself, its surface temperature can be accurately determined. The temperature measurement method has the advantages of non-contact and fast temperature measurement. [0003] A blackbody is an idealized radiator, which absorbs all wavelengths of radiant energy, has no reflection or transmission of energy, and has an emissivity of 1 on its surface. However, there is no true black body in nature, and the emissivity of...

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Problems solved by technology

[0005] However, the current emissivity calibration method is highly accurate but not suitable for on-site temperature measurement (such as a patented optical infrared radiation high-temperature calibration device and its self-calibration method, Chinese Invention Patent Publication No. CN102353454A, public date February 15, 2012 ); also have the device that is applicable to on-the-spot emissivity calibration but be inconvenient to carry (as patent a kind of infrared temperature measurement online self-calibration device and method thereof, Chinese Invention Patent Publication No. CN101183026A, open day on May 21st, 2008)

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