摘要
研制了一套用于面阵探测器360°连续扫描成像的红外光学系统。该光学系统包含了一个无光焦度的望远镜、一个方位补偿摆镜及一个二次成像物镜,采用了制冷型面阵红外探测器。引入了方位补偿摆镜,按二倍角关系朝相反方向摆动,解决了面阵探测器连续扫描中的成像拖尾与模糊问题。采用了像方扫描方式,使得摆镜通光尺寸由物方扫描的大约40 mm×220 mm缩减至目前14 mm×22 mm,摆镜质量减轻了95%以上,摆动频率可达100 Hz,使系统可在1 s内完成对360°方位的扫描成像。系统结构简洁紧凑,共由八片透镜以及一片反射镜组成,像质接近衍射限。实验室测试结果表明:方位补偿摆镜固定时,对小圆靶成像有明显拖尾成长条状;而开启摆镜摆扫之后,小圆靶成像清晰无变形,成像效果接近凝视型。
One set of infrared optical system which was based on a 360° continuous-scan focal plane array was realized. This optical system contained one afocal telescope, one compensation scan-mirror, and one re- imaging object lens. A cooled focal plane array sensor was utilized. The scan-mirror was used for azimuth compensation. It scaned at a special angular velocity according to the double angle relationship in the opposite direction, thus the system could solve the problem of image smear. Image space scanning was adopted by the system, thus the size of the scan-mirror can be reduced from about 40 mm×210 mm under object space scanning to 14 mm×22 mm now, and the weight of the scan-mirror could be reduced by more than 95%. Now the swing frequency could reach 100 Hz, which enabled the system to finish 360° azimuth- scan in one second. This system was succinct and compact. It contained eight pieces of lens and one piece of reflective mirror. The image quality was close to the diffractive limit. The laboratory test result shows that, when the scan-mirror is fixed, the image of the small circle hole is blurred, and has smear ghostphenomenon. After the scan-mirror compensation, the image of the circle hole is clear and without smear or distortion, and the image quality is similar to that of the starring system.
出处
《红外与激光工程》
EI
CSCD
北大核心
2016年第1期110-114,共5页
Infrared and Laser Engineering
基金
国家十二五国防预研项目(41101050501)
上海市现场物证重点实验室基金(2011xcwzk04)
中科院上海技术物理所三期创新项目(Q-ZY-108)
关键词
像方扫描
面阵探测器
360°连续扫描
方位补偿
消模糊
image space scan
focal plane array
360° continuous-scan
azimuth compensation
removing image smear
