高灵敏红外测温仪用于双园筒法测量比辐射率

HIGH SENSITIVITY IR THERMOMETER USED TO MEASURE EMISSIVITY BY TWO-COLUMN METHOD

用完整的热成象系统灵敏度方程,研究了高灵敏红外测温仪(红外辐射计)用于双园筒法测量物体比辐射率时,其噪声等效反射率差NE△ρ与噪声等效温差NETD的关系。对《风云一号》气象卫星辐射致冷器辐射定标用的蜂窝平面黑体源的比辐射率ε进行了测试,其结果与用Gouffe公式及能量选加原理对蜂窝面源平均比辐射率的计算值吻合得很好。指出了提高蜂窝面源比辐射率的有效方法。

By using the total sensitivity equation of thermal imaging systems, this paper gives the relationship between noise equivalent reflectivity difference NE△P and noise equivalent tempereture difference NETD of infrared thermometers when used to measure the emissivity of targets by the two-column method. The emissivity ε of the honeycomb blackbody is measured for radiation calibration of the radiant cooler in the FY-1 Meteorological Satellite and the measurement results agree well with the calculated ones with Gouffe's formula.