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飞秒激光跟踪仪通过PSD探测脱靶量实现目标跟踪,脱靶量零位是跟踪激光指向反射靶球的中心时反射激光在PSD上输出的光斑位置,跟踪时以脱靶量零位作为基准计算目标脱靶量,因此如何准确标定脱靶量零位是仪器实现精确测量的前提。文中在分析角反射器特性的基础上,结合仪器自身特点提出了一种基于角反射器的飞秒激光跟踪仪跟踪脱靶量零位标定方法。分析了脱靶量零位误差对仪器指向精度的影响;建立了跟踪脱靶量标定误差模型;根据仪器结构设计和轴系几何误差对脱靶量零位标定方法进行了仿真,结果显示,其误差小于17.8μm,当目标距离仪器10 m时,仪器的指向误差小于1.1″,该结果对系统误差补偿模型建立奠定了基础。最后,基于实际装置对仪器的脱靶量零位进行了标定,为后续仪器的动态测量提供了跟踪基准。
The femtosecond laser tracker achieves the target tracking by detecting the miss distance through the PSD. The miss distance zero is the spot position of the reflected laser output on the PSD when the laser is directed to the center of the reflecting target ball, and the target off-target is calculated on the basis of the missed target zero point Therefore, how to accurately calibrate the amount of miss distance zero is the prerequisite for the accurate measurement of the instrument. Based on the analysis of the characteristics of corner reflectors and combining with the characteristics of the instrument itself, a method of tracking zero distance calibration of miss distance based on corner reflectors is proposed. The influence of zero error of miss distance on the pointing accuracy of the instrument was analyzed. The calibration error model of tracking miss distance was established. According to the structural design of the instrument and the geometrical error of shaft geometry, the zero calibration method of miss distance was simulated. The result shows that the error is less than 17.8 μm, the pointing error of the instrument is less than 1.1 "when the target is 10 m away from the instrument, which lays the foundation for the establishment of the system error compensation model.Finally, based on the actual device, the zero of the miss distance of the instrument is calibrated, Dynamic measurements provide a tracking basis.