高速运动目标的光电精密测速系统误差分析

Error analysis of precision opto-electronic velocity measurement for high-speed moving object

在利用光电精密测速技术时,涉及复杂的空间光交汇计算,通用误差分析方法比较困难。在目标与光束垂直度适当的情况下,目标运动方向的偏差对测量精度的影响属于二阶小量。系统整体误差的主要来源为距离测量误差、时间测量误差以及光束不平行度产生的误差。分析得出,本系统在两光束间的不平行度α=100″,探测器对准精度为0.1mm的情况下,测量精度可以达到0.02%。

It was related to complex calculation of attitude in opto-electronic precision velocity measurement technology with general error analysis. The impact on measure precision produced by the deviation of object moving directivity is negligible because it is second order small quantity in the condition that the angle between the direction of object and light beam is as vertical as possible. The entire system error is mainly caused by the length error and time error and light-beams non-parallelism. Analysis shows that when non-parallelism is α=100＂and opto-detector alignment precision is 0.1mm, the system measurement precision can be up to 0.02%,