Infrared temperature measurement method and infrared temperature measurement system

Abstract

An infrared temperature measurement method comprises the following steps of: (1) when a temperature of a measured object in actual measurement is t, utilizing an automatic variable double wavelength infrared detector to measure radiation intensity E1 (lambda 1, t) and E2 (lambda 2, t) of the measured object, wherein E1 (lambda 1, t) is corresponding to the radiation intensity of the measured object when a wavelength is lambda 1, and E2 (lambda 2, t) is corresponding to the radiation intensity of the measured object when the wavelength is lambda 2; (2) substituting the measured E1 (lambda 1, t) and E2 (lambda 2, t) into a formula E1 (lambda 1, t)=alpha lambda[1]<-5> (e<delta / lambda[1]t>-1)<-1> and a formula E2 (lambda 2, t)=alpha lambda[2]<-5> (e<delta / lambda[2]t>-1)<-1>, and calculating values of coefficients alpha and delta, wherein alpha and delta are coefficients which are changed with material composition, temperature and measurement wavelength of the measured object; (3) substituting the calculated values of the coefficients alpha and delta into a measured object radiation intensity formula E(lambda, t) = alpha lambda-5(e delta / lambda t-1)-1 to obtain a corresponding relation curve between the radiation intensity and the temperature of the measured object with a given wavelength; (4) utilizing the automatic variable double wavelength infrared detector to measure the radiation intensity of the measured object with the given wavelength, and obtaining the temperature of the measured object based on the corresponding relation curve between the radiation intensity and the temperature of the measured object with the given wavelength. According to the infrared temperature measurement method, the temperature of the measured object can be accurately measured.

Description

technical field [0001] The invention relates to an infrared temperature measurement method and an infrared temperature measurement system. Background technique [0002] In the process of iron and steel smelting, one of the commonly used temperature measurement methods is to use thermocouples. Due to the high temperature of molten steel, the thermocouple may be melted during temperature measurement. It is necessary to repeatedly measure the temperature of molten steel every time a furnace of steel is smelted. On the one hand, this requires a large number of thermocouples, and on the other hand, it will cause pollution to the molten steel and reduce the quality of the molten steel. [0003] Infrared temperature measurement technology is more and more used in iron and steel smelting, photovoltaic semiconductor industry, ceramic industry, glass production, and Crystal growth and other fields. [0004] Existing infrared temperature measuring devices are all based on treating t...

AI Technical Summary

Problems solved by technology

Therefore, there are two problems in the existing infrared temperature measurement method: first, due to the inaccurate correction of emissivity, the temperature measurement accuracy can only stay at the level of 1%; Temperature measurement by windows or radiating objects that require temperature measurement through surface coverings cannot be accurately measured, because the window or covering will greatly reduce the radiation intensity of the object

In addition, smoke, dust, etc. are generated during the smelting process, and their random fluctuations seriously interfere with the transmission of infrared radiation

Therefore, the temperature measurement error of the existing infrared temperature measurement method is in the range of tens of degrees or even hundreds of degrees, which does not meet the needs of technological development at all.

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