Radiation Measurement of the Real Temperature Based on Specific Wavelength

Abstract

The method of radiation thermometry has many advantages such as the wide temperature measurement range, the needless of establishing heat balance and has a good applicable prospect in aerospace as well as remote sensing. The theory of measuring real temperature in radiation thermometry is studied in this article by using mathematical analysis. This article establishes radiation thermometry model and points out the condition of measuring real temperature. A phenomenon is revealed through the analysis of radiation thermometry model that the real temperature of objects can be measured at specific wavelength even if the set emissivity function of pyrometer is different from object’s emissivity function. According to the phenomenon, a new radiation thermometry method— —the multi-wavelength thermometry based on specific wavelength is proposed in this paper. This new method relaxes the limits of object’s emissivity function from traditional multi-wavelength thermometry methods, which can measure the real temperature of the object as long as the specific wavelength can be found. According to the simulation experiment, the author proves that the multiwavelength radiation thermometry based on specific wavelength can measure the real temperature of the object, and points out that specific wavelength has numerically uncertain property. Finally, the author indicates the problems existing in the multi-wavelength thermometry based on specific wavelength and the future direction of the radiation thermometry development.