紫外可见光图像叠加精确度是评价紫外成像仪定位可见光背景下的紫外信号的关键指标, 体现了紫外成像仪的紫外光图像与可见光图像融合的精确程度。为评估紫外可见光图像叠加精确度这一关键指标, 本文设计并实现了紫外成像仪的紫外可见光图像叠加精确度测试系统。系统选择高均匀性、高亮度、宽辐照度范围的紫外积分球光源照射十字靶标, 在紫外平行光管的作用下, 使紫外成像仪能够观测到一个无穷远的像, 通过测量紫外光图像与可见光图像的十字像中心点坐标的偏移量, 实现了对紫外成像仪的紫外可见光图像叠加精确度的测试。实验结果表明, 该测试系统可为紫外成像仪提供可靠的检测依据, 满足紫外成像仪筛选的应用需求。

The superposition accuracy of ultraviolet (UV)/visible images is a key index for evaluating the UV imager. The evaluation is performed by locating the UV signal under a visible light background, which reflects the fusion accuracy of the UV/visible image of the imager under consideration. To evaluate this key index, i.e., the superposition accuracy, this paper proposes the design and implementation of a testing system for estimating the superposition accuracy of the UV imager. The system selects the UV integrating sphere light source with high uniformity, high brightness and wide irradiance range to illuminate the cross target. Under the action of the UV collimator, the imager allows for the observation of an infinity image. By measuring the offset between the cross-center point coordinates of the UV/visible image, the superposition accuracy of imager can be estimated. The experimental results show that the testing system can provide a reliable detection basis for the UV imager and also meet the assessment requirements of the UV imager.