摘要
为了提高光电检测系统对激光目标点的测量精度,设计了由11个等距离激光目标点组成的畸变检测装置。根据测量得到的系统畸变变化情况,拟合出实时测量时目标点在线阵CCD上成像位置的补偿方程。在确定补偿方程时,分别进行了一次线性方程、二次方程、三次方程和四次方程拟合,并进行了理论分析和实验测试。在对焦距的30.01mm的光学测量系统进行拟合测试时的结果表明,二次方程和三次补偿方程均可以满足测量要求,其中三次拟合方程补偿得到的像(误差为0.0045mm)略微优于二次拟合补偿效果(误差为0.0053mm),但实际工程测量中主要采用二次拟合方程来减小计算中误差传递,其中采用二次拟合方程补偿后即可使系统的测量精度从1.82%提高到0.07%。
In order to raise the measure precision for laser goal, the distortion detection installation which consists of 11 equidistant laser goal points is designed. According to the change of systematic distortion,the compensation equation is fitting to ioin point location imagined by object point on linear CCD in real time measurement. Then the compensation program is compiled to carry out real time correction on distortion. In order to establish the eqation format, the linear eqation,quadratic equation, cubic equation and quartic equation are separated to fitting and compiled in experiment program. The experiment result shows, both the quadratic equation and cubic compensation equation can fulfill actual measure demand, and the correction effect of cubic equation（error is 0. 004 5 mm） is slightly better than that of quadratic equation （error is 0. 005 3 mm） when the equation is fitting for measuring system whose focus is 30.01 mm. But quadratic equation is applied in engineering survey to reduce propagation of error in calclate. And quadratc equation can raise the measurement precision from 1.82% to 0.07% after correction compensation.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2008年第1期83-86,共4页
Journal of Optoelectronics·Laser
基金
中国科学院二期创新基金资助项目(C02N021)
关键词
光电检测
数字校正
拟合方程
测量精度
photoelectronic measurement
digital correction
fitting equation
measuring precision
