非致冷红外焦平面成像系统辐射测温技术研究

Research on Radiation Thermometry Using Uncooled Infrared Focal Plane Imaging System

为了消除由非致冷红外焦平面自身温度变化造成的辐射测温偏差,提出了一种基于G-t(黑体辐射灰度-探测器工作温度)标准曲线进行辐射测温的新方法。该方法从热辐射理论和热像仪测温原理出发,利用实验测得的G-t标准温度关系曲线,并结合灰体表面真实温度的计算公式,最终实现了非致冷红外焦平面成像系统的高精度辐射测温。实验结果表明,当探测器的工作温度在26℃～35℃、黑体温度在35℃(308K)～45℃(318K)时,绝对温度偏差低于1K,有效地消除了非致冷红外焦平面自身的温度变化对辐射测温精度的影响。

In order to eliminate the measurement deviation caused by the temperature variation of an uncooled infrared focal plane array,a new radiation temperature measurement method based on the standard G-t（Gray level detected from a blackbody-Temperature of an infrared detector） curves is proposed.According to the thermal radiation theory and the temperature measurement principle of a thermal imager,the standard G-t curves measured in the experiment are combined with the real temperature formula for a graybody.Finally,the radiation thermometry with high precision is realized by using an uncooled infrared focal plane imaging system.The experimental result shows that when the detector is operating in the temperature range from 26℃to 35℃and the blackbody is in the temperature range from 35℃（308K） to 45℃（318K）,the uncooled infrared focal plane imaging system has its absolute temperature measurement deviation less than 1 K and the influence of the temperature variation of the uncooled infrared focal plane array itself on the radiation thermometry precision is eliminated effectively.