目前热像仪MRTD测试主要在室内,为了满足外场热像仪MRTD测试的需求,研制了一种便携式MRTD测试仪.文章主要阐述了仪器的研制原理、光学优化设计、结构设计及黑体组件等的设计要点.目前,该仪器已经用于外场环境的热像仪MRTD测试,结果准确.

光亮度是表征发光体的重要光度特性参数.提出了一种超低亮度计的设计方法,描述了超低亮度计的工作原理和组成;利用微弱光信号处理技术、非线性校准技术、制冷散热技术等实现了超低亮度的自动测量;根据亮度计的测量原理,对仪器进行了标定,测量不确定度达到5％.超低亮度计可适用于实验室和现场等测试场所,为微光夜视装备、显示系统、特种光源、发光材料等的性能评估测试和校准提供计量保障.

研究了脉冲光源有效光强空间分布的Blondel-Rey法,采用复合梯形数值积分实现了瞬时光强的测量,并对高色温光源测量时的光谱失配校正进行了分析.构建了基于双反射镜同步测量原理的脉冲光源有效光强空间分布测量装置,详细分析了全空间分布式旋转平台、脉冲光强探测系统、光谱失配校正用高分辨率光谱仪等重点组成部件.采用高色温调制光源对测量装置进行了校准.最后,对该装置的测量不确定度进行了分析,其扩展不确定度可以达到3.0％.

The spatial noise on staring array thermal imager restricts its capability in detecting , distinguishing and tracking the long distance targets .To solve the problem in measuring the thermal imager spatial noise ,its measuring theory was analyzed and the mathematical model for measuring the spatial noise based on signal transfer function (SiTF) was presented .After removing the temporal noise equivalent temperature difference (NETD) from the noise of a certain group or district or the whole pixels in thermal imager ,the spatial NETD model was calculated through analyzing statistically the noise of those pixels .In measuring the SiT F and spatial NETD of cooled MCT320 × 256 thermal imager ,when the temperature of the back‐ground blackbody is 5 ℃ ,the SiTF of central district in field of view(FOV) is 27 .29 mV/℃ , and the spatial NETD is 0 .128 ℃ .When the temperature of the background blackbody is 20 ℃ ,the SiTF of central district in FOV is 29 .03 mV/℃ ,and the spatial NETD is 0 .121 ℃ .The measuring results show that the measuring method can evaluate the influence of spatial noise on the perform‐ance of thermal imager .

In order to solve the calibration of the infrared imager test equipment,a kind of infrared radiometer in which the temperature of interior reference blackbody was equal to the environmental temperature was designed.In order to evaluate this kind of radiometer and give guidance to the infrared radiometer design,a mathematic model for infrared radiometer noise equivalent temperature difference(NETD)was given.The NETD of infrared radiometer was estimated under different electronic bandwidths and spectral wavebands.The results show that when noise equivalent bandwidth is within 1 Hz,NETD of infrared radiometer in mid-wavelength infrared(MWIR) and long wavelength infrared(LWIR) spectral bands is smaller than 0.01℃,which can meet the requirements of the calibration of infrared imager test equipment.