Development of Measurement System on Radiative Properties of SolidMaterials in Infrared Region at Near Room Temperature

摘要

The separation blackbody method is one of the measurement methods of the emissivity. According to thernmethod, the emissivity is obtained by measuring the ratio of the radiation energy from a specimen to thatrnfrom a reference blackbody with the same temperature. In this case, it is necessary to be kept at the samerntemperature with the specimen and the reference blackbody. Additionally the irradiation from thernsurrounding and the reflected radiation at the specimen must not be detected by a detector. The separationrnblackbody method is simply to measure the emissivity of specimen at high temperature compared with thernsurrounding temperature. In the present study, a modified separation blackbody method was developed inrnorder to measure the emissivity at near room temperature. The new equipment was designed so as to preventrnthe influence of radiation from the surroundings by an attachment of cooled shade. The emissivity ofrnpainting copper plate was more than seven times as high as that of non-painting copper plate. Neither datarndepended on the temperature. Except for metal, the emissivity of environmental constituents was higher thanrn0.8.