| Summary: | 碩士 === 國立彰化師範大學 === 機電工程學系所 === 105 === Correct and reliable temperature measurement is necessary for the industry, The accuracy of the non-contact temperature measurement is related to the specific surface emissivity of the object.
In this study, cold and hot wafers were used as the blackbody. Five samples of metal and nonmetal, aluminum, copper, iron, bamboo charcoal and graphene were used to measure the blackbody and samples at 35ﾟC, 40ﾟC, 45ﾟC, 50ﾟC, 55ﾟC to calculate the temperature difference between the individual emissivity, The basic temperature was measured with a thermocouple and the control temperature was measured with a radiation gun, the reading is the surface radiation conversion out The temperature is related to the emissivity of the material. The more radiation it is, the more readings it displays. The measured emissivity is calculated from the radiated power, but we simply change the radiated power to temperature to derive it.
Experimental verification analysis, aluminum, copper, iron because of the characteristics of the metal relationship, the surface is smooth, good reflectivity, emissivity on the low. Bamboo charcoal and graphene because the surface is dark and rough, low reflectivity, high emissivity. Because the emissivity will change with temperature and wavelength changes. The emissivity of the object is related to the surface state of the object (including color, light and dark, thickness, temperature, oxide, dye, coating thickness). The emissivity of the metal increases with increasing surface temperature, whereas the emissivity of the nonmetal is generally decreased with increasing surface temperature, and the emissivity of the metal is much smaller than that of the nonmetal.
Summary The emissivity measurement method proposed in this experiment has the advantages of simple operation, convenient and rapidity, relative stability and so on.
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