光电测量系统畸变的实时数字校正

根据视场角为70°的大视场光电测量系统中光学系统产生畸变的机理及径向变化的特点,设计了由11个等距激光目标点组成的畸变检测装置。对于不同的光学测量系统,按照畸变检测的三个步骤对光学系统的畸变进行检测,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,编写出成像位置数据采集及实时处理的补偿程序,提高了测量系统实时测量的精度。在对焦距为29.98 cm的光学系统进行实际校正测试中,结果表明,当目标物距为1 651.59 mm、物高为400.007 mm时,按照拟合的二次补偿方程进行计算补偿,可将畸变误差从校正前的-0.026 4 mm提高到校正后的-0.002 9 mm,并使系统整体检测精度从0.36%提高到0.04%。

Real time digital correction for distortion in photoelectronical measuring system

In the photoelectronical measuring system with a big field of view of 70°, distortion caused by optical system leads to the image of object in linear CCD deviation from the theoretical point, which results in system measuring errors. In the practical project measuring system, in order to improve measurement precision of the point of laser goal in the system, a set of installation for optical detection systematic distortion is designed. This installation on the basis of distortion mechanism and radical character has eleven equidistance points of laser goal. For different optical measurement systems, when distortion is detected in according to three steps, the compensation equation for goal in linear CCD in real-time measurement is fitted. Then the program on data collection and real-time manipulation of imaging position will be compiled to improve the precision of measurement system on real-time nicety measurement. The experiment results show that the installation can reduce error obviously from -0.026 4 mm to -0.002 9 mm in according to the compensation equation when the distance is 1 651.59 mm and the height is 400.007 mm, and raise the whole systematic detection precision from 0.36% to 0.04%.