小型高精度红外黑体辐射源的设计

摘要

An infrared blackbody radiator is a pivotal part of test and calibration equipment for an infrared system.To meet the requirements of minitype,light weight and high-precision for portable field test equipment of the infrared imager,we designed the structure,control circuit as well as the software of blackbody radiator . The blackbody radiator component,small and highly efficient,was composed of red-copper radiant area,thermoelectric cooler and thermal sink .The temperature acquisition precision of 0.0122 ℃was realized by using the bridge for measuring temperature driven by the constant current .The conversion precision of 0.01 ℃between the acquired voltage and the real temperature was achieved by using the indexing function of platinum resistance and the Newton iteration method .Test result shows that the emissivity,temperature control precision and the size of the IR blackbody radiator can meet the requirement,and the infrared blackbody radiator has successful application effect .%红外黑体辐射源是实现红外成像系统性能检测和定标的关键设备，针对红外热像仪便携式野战测量设备小型、轻量、高精度的要求，设计了黑体辐射部件的结构、硬件电路和控制软件。采用紫铜辐射面、热电制冷器、散热片等设计了小型高效的热辐射源部件，采用高精度恒流源驱动测温电桥，实现了0．0122℃的温度采集精度，采用铂热电阻的分度表函数及牛顿迭代算法，使采集电压与实际温度的转化精度达0．01℃。该红外黑体辐射源的辐射面发射率、温度控制精度、外形尺寸等各项指标通过测试，达到设计要求，取得了理想的应用效果。