外场使用红外靶标系统的设计

Design of infrared target system for outfield

为了实现在外场对红外探测器进行最小可分辨温差(MRTD)测试,对MRTD的原理及过程进行了阐述,结合过去常用的技术手段,设计了一套用于外场的红外靶标系统。利用面源黑体作为被测目标源,降低了控制难度;采用旋转靶轮的方式切换不同的空间频率,减小了面源黑体的尺寸;利用二维调节机构实现目标靶方位角与俯仰角的手动调节。红外靶标系统可实现5℃~100℃的温度变化,靶面温度不均匀性小于1℃,可提供12组不同空间频率的MRTD测试靶标。经过有限元分析表明:整个系统稳定性好,可以满足外场MRTD测试的需要。

In order to realize the minimum resolvable temperature difference(MRTD)test of infrared detector in outfield,the principle and process of MRTD were described.Combined with the technical means in the past,a set of infrared target system for outfield was designed.By using the blackbody as the target source,the difficulty of control was reduced;by using the rotating target wheel to switch different spatial frequencies,the size of the blackbody was reduced;by using the 2D regulating mechanism,the azimuth and pitch angle of the target could be adjusted manually.The infrared target system can change the temperature from 5℃to 100℃,and the target surface temperature inhomogeneity is less than 1℃.It can provide 12 groups of MRTD test targets with different spatial frequencies.After the finite element analysis,it is proved that the whole system has good stability and can meet the needs of outfield MRTD test.