边缘视场检焦在航空遥感器中的应用  

Application of auto-focusing with margin field for airborne remote sensor

作　　者：张继超[1,2] 

机构地区：[1]中国科学院航空光学成像与测量重点实验室,吉林长春130033 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《红外与激光工程》2013年第4期1038-1043,共6页Infrared and Laser Engineering

基　　金：国家863计划(2006AA06A208);中国科学院知识创新领域前沿项目(070Y32R070)

摘　　要：针对大面阵航空遥感器检焦存在的问题,提出了一种通过边缘视场检焦确定中心视场焦面位置的方法。通过倾斜安装与精密装调相结合的方法来提高检焦精度,检焦系统的倾斜安装能够解决边缘视场视场角对检焦的影响,利用显微镜装调、照相装调和电控校准来实现检焦像面的粗、精和精细标定,解决边缘视场与中心视场像面存在差异的问题。检焦系统的伺服控制采用粗精结合、遍历搜索的方法搜索出焦面的最佳位置,搜索最短步长为0.01 mm。经分析计算,检焦重复精度为0.03 mm,在焦深范围内,满足使用要求。经试验验证和试飞验证,证明该自动检焦方法检出的焦面准确,得到的照片效果良好,该方法切实可行。To solve the problem of auto-focusing in large array airborne remote sensor, a method to search position of focal plane in center field through auto-focusing in margin field was presented. Combination of oblique assembling and fine setting were taken to improve precision of auto-focusing, which could settle the influence of field angle in margin field. Microscope adjustment, photographic adjustment and electric adjustment were used to realize coarse calibration, accurate calibration and fine calibration of focal plane position and the problem of difference between focal plane position in center and in margin field was resolved. In servocontrol of the auto-focusing system, coarse-to-fine and ergodic hunting method were taken to find the optimum position of focal plane. Minimum step length was O.0lmm, and repeatability precision was 0.03mm, which was within focal depth and met the requirement. After experiment and flight test, focal plane that was detected by this method was accurate and the photographs were in high quality.

关 键 词：边缘视场检焦 倾斜安装 精密装调 粗精结合 

分 类 号：TH745[机械工程—光学工程] V248.1[机械工程—仪器科学与技术]