单黑体温控的热成像仪MRTD野外在线自动检测技术研究

Field on-line automatic test technology of infrared thermal imager MRTD by single blackbody temperature control technology

为满足红外热像仪MRTD野外在线全自动检测要求,设计了一种新型MRTD检测方法。硬件采用单黑体温差控制技术,在减小检测设备体积质量的同时保证了黑体目标与环境背景的温差控制精度,采用串口通信控制与CCD图像采集处理等技术有机结合实现温差控制及图像采集处理的协调统一;在软件上采用优化的处理算法精确地提取目标及背景区域,并利用不同温差下目标与背景区域的灰度差计算出被测热像仪MRTD参数值。经实验检验,该结果与人眼观测所得结果误差在0.02℃以内,研制出的检测设备具有结构简单、体积及质量小、操作简便等优点。

To meet online automatic infrared camera minimum resolvable temperature difference （MRTD） field testing requirements, a novel method for detecting MRTD was presented. In hardware aspect, the use of the single blackbody temperature control technology not only reduced the volume and quality of testing equipment but also guaranteed the accuracy of the temperature difference control between blackbody target and environment background, and by combining serial interface communica tion technology with CCD technology, the cooperation of the temperature control and image acquisi tion was achieved In software aspect, the use of optimized algorithm could precisely extract the target and background region, and calculate the MRTD using gray difference between target and background region. The experiments show that the error is less than 0.02 vcompared with the results observed by eye. The testing equipment has simple structure, small volume, convenient operation, it can realize the automatic test of MRTD under field condition.