双光斑重叠式PSD空间点位测量系统研究

针对空间点位测量的问题,设计了一种新型双光斑重叠式PSD空间点位测量系统。构建了测量系统的测量平台和运动控制平台,并将光电位敏传感器PSD作为测量系统测头上的靶标,形成了空间测量三角形,采用逐次逼近算法,使两个光斑在PSD上轮流交替跟踪,实现了测量系统的自动跟踪,并利用PSD对于光斑重心采集的原理,判断两光斑重合情况,进行了空间点位信息的采集测量。以某型航空发动机8级涡轮转子叶片为测量对象,用三坐标测量机和本测量系统分别对其进行了测量对比试验。研究结果表明,测量系统对距离测量系统1.5 m远处,对目标点的测量偏差为亚mm级,正向偏差维持在0.4 mm以内,负向偏差维持在-0.25 mm以内。

Spatial coordinates measurement system based on double spots overlapped PSD

Aiming at spatial coordinates measurement,a new spatial coordinates measurement system based on the double spots overlapped PSD was designed.The measurement and control platform of the spatial coordinate measurement system was constructed and photoelectric sensor PSD was taken as the target on the measurement head to form the measuring triangle.A successive approximation algorithm to make double spots alternately tracking on the PSD and realize the automatic tracking of the measurement system was used.The principle of PSD acquisition spot center of gravity and judging double spots overlap was used by the measurement system to measure the information of spatial coordinates.An 8th level turbine rotor blade of a certain type aircraft engine was taken as measuring object of the measurement system.The results indicate that measured by three coordinate measurement machine and by our measurement system,the deviation of our measurement system for target is at sub-millimeter level,and maintains at the range of ＋0.4 mm～-0.25 mm when the distance varies in 1.5 m from the measurement system.