红外热成像系统作用距离预测方程计算误差探析

摘要

理论上讨论了能量传输过程中辐射出射度差和温差之间的关系，探讨了红外热成像系统作用距离方程小温差条件下近似计算的本质，分析了近似计算所产生的误差受温差大小、背景温度和工作波长影响的情况。基于 MRTD 的定义和红外热像仪成像的原理，在前述探析的基础上，提出更为符合红外热成像物理过程的作用距离方程计算方法，并实例计算了给定条件下的作用距离。计算结果表明，本文提出的计算方法更为符合辐射能量实际传输情况，具有更好的精度。%The paper theoretically discusses the relationship between the radiant exitance difference and temperature difference in the energy transmission, the nature of the approximate calculation under the condition of small temperature difference, and the error affected by approximate calculation influenced of the size of temperature difference, background temperature and wavelength. It also puts forward a calculation method which is more accord with the physical process of the infrared thermal imaging system adjusted by the definition of MRTD and the theory of the infrared imaging system. On this basis, the paper calculates the range of the given conditions. The results show that such method of calculation tallies more with the actuality and has better accuracy.