摘要
航空相机执行机构的核心是像面扫描系统,要求高扫描精度、高扫描频率、体积小、结构简单,否则成像模糊、成像帧频低。国内外低精度的扫描机构采用旋转电机外加凸轮、齿轮、涡轮蜗杆等机械传动机构将旋转运动变为直线扫描运动,搭建的像面扫描系统体积大、结构复杂、智能化程度低与未来相机的发展趋势不吻合。设计的新型高频高速像面扫描结构,直线往复扫描运动执行机构选用音圈电机,像面扫描方式为矩形扫描方式。为满足指标要求,采用音圈电机持续力控制和滞后超前控制相结合的控制策略。实验表明,线速度103mm/s,线性行程0.2mm时,实现了扫描频率15Hz,稳速精度±0.2%,满足了工程要求。
Image scanning system is the core sub-system of aerial camera. It requires high scanning accuracy, high scanning frequency, small size, simple structure, otherwise, the image is blur and image frame rate is low. Low-precision scanning mechanism abroad changes the rotary motion into linear scanning movement using rotary motor plus cams, gears, worm and other mechanical transmission mechanism. The image plane scanning system is bulky, has complex structure and low intelligence. It does not match the trends of future camera. Voice coil motor is chosen to produce linear reciprocating motion for the new design high-frequency and high-speed image scanning structure. Image scanning mode was rectangular scanning. In order to achieve high control accuracy and high repetition rate, intelligent control method with continuous force control of VCM was introduced. Image scanning frequency can reach 15 Hz, scanning speed accuracy can be in 0.2%, the linear travel was at least 0.2 mm, linear scanning speed is 103 mm/s. The experimental results shows that it is stronger in robustness, better in adaptability, the quality and effect of control are satisfactory. This result can meet the specific requirements of the project.
出处
《红外与激光工程》
EI
CSCD
北大核心
2014年第5期1540-1544,共5页
Infrared and Laser Engineering
基金
中国科学院知识创新工程领域前沿项目资助
