可见光光电成像系统整机综合参数校准技术研究

为了准确、客观地评价可见光光电成像系统整机性能参数，研制了可见光光电成像系统整机综合参数校准装置。装置由积分球光源系统、标准测试卡、光学准直系统、支撑调整台、视频数据采集模块和综合处理软件等几部分组成，主要完成系统分辨力、调制传递函数（MTF）、对比度、噪声功率谱、噪声等效亮度、灵敏度等性能参数的测量。针对某型号可见光电视产品，验证了装置的有效性，给出了综合参数的测量结果，其截止频率为39.4 mm-1,对比度为76.5％，均方根噪声电压为2.14 mV，噪声等效亮度(NEL)为0.045 5 cd/m2，信号传递函数对应的灵敏度为47 mV（cd/m2)-1。最后，分别采用照度计和标准视频发生器对装置进行了标定，其积分球光源出口亮度和信号采集系统输出电压最大相对测量误差分别为-2.3％及1％。

Calibration for integrated parameters of visible photoelectricimaging system

In order to evaluate the integrated properties of visible photoelectric imaging system exactly and objectively, the calibration equipment was developed. The equipment was composed of integrating sphere, standard card, off-axis reflective collimator, mechanical adjustment bench, video acquisition module and comprehensive software. It could complete a measurement of resolution,contrast,optical transfer function(MTF),noise power spectrum, noise equivalent light and sensitivity.For a certain visible photoelectric imaging product, the effectiveness of the equipment was proved. The comprehensive parameter measurements are given:the cut-off frequency is 39.4 mm-1, the contrast is 76.5%,the root-mean-square (RMS) noise is 2.14 mV,the noise equivalent light(NEL) is 0.045 5 cd/m2 and the sensitivity is 47 mV·（cd/m2)-1. In addition, an illuminometer and a standard video pattern generator were respectively adopted for making calibration, results show that the maximum relative measurement errors of integrating sphere and the signal acquisition system are -2.3% and 1%.