不同非均匀性校正温度的红外测温技术

为使制冷型中波红外热像仪在不同环境温度下经过非均匀性校正后保持较高的测温精度，研究了考虑非均匀性校正温度效应的中波红外热像仪标定模型。利用不同温度的面源黑体对热像仪进行非均匀性校正，然后对黑体目标进行测温实验，获得了不同校正温度下热像灰度与黑体辐射亮度之间的变化关系，建立了目标的测温数学计算模型，最后对测温结果进行误差分析。结果表明：在不同校正温度下，热像灰度相对非均匀校正辐亮度的漂移可做线性化处理，且与目标温度变化无关。在非均匀性较低的测温范围内热像仪的测温误差小于±0.22 ℃，极大减小了制冷型中波红外热像仪在不同校正温度下非均匀性校正后的测温误差。

Infrared thermometry technology with different nonuniformity correction temperatures

In order to keep high accuracy of temperature measurement of the cooled medium-wave infrared thermal imager after nonuniformity correction under different ambient temperatures , the calibration model of the medium-wave infrared thermal imager is analyzed with the consideration of the effect of the nonuniformity correction temperature .The nonuniformity of thermal imager is corrected using surface blackbody under differ-ent temperatures .The relationship between the gray and blackbody radiance is obtained by thermometry exper-iment of blackbody target .The mathematical calculation model of target temperature is established and the er-ror of thermometry result is analyzed .The results show that the drift of gray of thermal image as nonuniformity correction radiance under different correction temperatures can be treated linearly , and is independent on the target temperature .When the nonuniformity is low , the temperature measurement error of the thermal imager is less than 0.22℃, which greatly reduces the temperature measurement error of the cooled medium-wave infra-red thermal imager after nonuniformity correction under different correction temperatures .