一种最小可分辨温差计算方法  

A Calculation Method of Minimum Resolvable Temperature Difference

作　　者：毛谨[1] 

机构地区：[1]四川九洲电器集团有限责任公司,四川绵阳621000

出　　处：《红外》2014年第10期27-32,共6页Infrared

摘　　要：提出了一种红外成像系统的最小可分辨温差(Minimum Resolvable Temperature Difference,MRTD)预测方法。该方法以线性系统理论为基础,利用调制传递函数建立红外成像系统模型,模拟生成不同空间频率的标准四杆靶(长宽比为7:1);通过分析四杆靶的二维(横向和纵向)成像质量,引入对比度修正因子,获取系统输出的四杆靶与背景的温差;利用阈值输入对比度温差,得到系统的MRTD。仿真试验表明,该方法预测的MRTD值与实际测量值一致。A method for predicting the minimum resolvable temperature difference（MRTD） of an infrared imaging system is proposed.The method is based on the linear system theory.It uses the modulation transfer function to establish an infrared imaging system model for simulating and generating standard four-bar patterns with different spatial frequency（it has an aspect ratio of 7：1）.By analyzing the two-dimensional（horizontal and vertical） imaging quality of the four-bar pattern and introducing a contrast correction factor,the temperature difference between the four-bar pattern and the background output from the system is acquired.Then,the threshold input contrast transference is used to obtain the MRTD of the system.The simulation results show that the MRTD predicted by this method is coincident with the actual measurement value.

关 键 词：红外成像系统 阈值输入对比度 最小可分辨温差 对比度修正因子 

分 类 号：TN219[电子电信—物理电子学]