Temperature measurement calibration system and temperature measurement method

Abstract

The invention relates to a temperature measurement calibration system and a temperature measurement method. The temperature measurement calibration system comprises a black body unit, a thermal imaging unit, a step-in high-and-low-temperature chamber and a control unit. The control unit is used for controlling the black body unit to generate thermal radiation according to preset radiation temperature in each preset time period, adjusting the temperature of the step-in high-and-low-temperature chamber in different time periods according to a preset temperature value and controlling the thermal imaging unit to rotate until an imaging center of the thermal imaging unit is aligned to a heating center of the black body unit; the control unit fits data of temperature values, measured at different high and low temperatures, of all black body radiation sources; during temperature measurement, a temperature value inputted by the thermal imaging unit is operated according to a fitting formula to acquire a final temperature measurement result; the thermal imaging unit is used for measuring the temperature of the black body unit and sends the measured temperature to the control unit. By the temperature measurement calibration system and the temperature measurement method, response curves of a plurality of thermal infrared imagers at different environment temperatures are calibrated to compensate influences of temperature drift on accuracy in temperature measurement in practical application.

Description

technical field [0001] The invention relates to a temperature measurement calibration system and a temperature measurement method. Background technique [0002] In nature, when the temperature of an object is higher than absolute zero, due to the existence of its internal thermal motion, it will continuously radiate electromagnetic waves to the surroundings, including infrared rays with a waveband of 0.75 μm to 100 μm. Its biggest feature is that at a given temperature and wavelength, the radiant energy emitted by an object has a maximum value. This kind of material is called a black body, and its reflection coefficient is set to 1. The reflection coefficient of other materials is less than 1, called black body. It is a gray body, because the spectral radiation power P(λT) of a black body and the absolute temperature T satisfy Planck's law. It shows that at the absolute temperature T, the radiation power of the black body per unit area at the wavelength λ is P(λT). (1) As ...

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Problems solved by technology

[0008] Therefore, temperature drift is the root cause of temperature measurement error

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