转台角速率的高速摄像测量方法  

High-speed video measurement method for rotary table angular rate

作　　者：杨亮[1,2] 沈湘衡[1] 张宁[1] 赵玉艳[3] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院研究生院,北京100039 [3]中国白城兵器试验中心,吉林白城137001

出　　处：《沈阳工业大学学报》2011年第1期97-101,120,共6页Journal of Shenyang University of Technology

基　　金：国家863高新技术计划资助项目(2008AA7034320B)

摘　　要：针对精确测量转台角速率在转台性能评价中的重要性问题,提出一种测量转台角速率的高速摄像方法.该方法利用平行光管作为可测目标固定在转台上,目标的空间位置与转台转动的角位置相对应,在转台转动过程中,通过高速相机记录目标空间位置实现测量,并采用像元细分技术定位的方法来提高测量精度,细分精度达到0.03个像元.利用该方法对某型号的低速转台进行了试验数据采集及分析,验证了该方法的可行性.误差分析结果表明,在转台角速率为0.2°/s时,该方法的测速精度可达到3.405×10-4,完全可以用于高精度转台的角速率测量.由于高速相机的采样频率较高,因此,实现了转台瞬时角速率的测量.该方法的非接触测量方式实现了对转台角速率的客观评价.For the importance of measuring accurately the angular rate in the performance evaluation of rotary table,a high-speed video method for measuring the angular rate of rotary table was proposed.A collimator tube was fixed to the rotary table as a measureable objective,and the space position of the objective was corresponding to the rotating angular position of the table.In the rotating process of rotary table,the objective space position was recorded with a high-speed camera and thus the measurement was implemented.The orientation method with the pixel subdivision technology was adopted to improve the measurement precision,where the subdivision precision could reach 0.03 pixels.This method was used to collect and analyze the test data for a certain type of low-speed rotary table.The error analysis result shows that the precision of rate measurement can reach 3.405×10-4 when the angular rate of rotary table is 0.2°/s.It means that the present method can be used for measuring the angular rate of high-precision rotary table.The instantaneous angular rate of rotary table can be measured due to the high sampling frequency of high-speed camera.The objective evaluation for the angular rate of rotary table is realized with the non-contact measurement way in the proposed method.

关 键 词：光电测量 惯性技术 高速摄像 角速率 转台 亚像素 空间角度模型 测速精度 

分 类 号：TB934[一般工业技术—计量学]