Methodology for absolute measurement is proposed by using an outside installation mechanism in laser tracking measurement system , which has an important reference value in practicality in high accuracy assembly and inspection of large - scale mechanical field . spherical tracking servo mechanism " s model described in this paper not only is a new thought but also have much reference value in the mechanical design and other industrial machines design 本文提出的外置式激光跟踪测距系统应用于无导轨曲线测量的设计方法在大型机械现场组装与安装中具有较高的参考价值和实用价值，提出的球形跟踪伺服机构的设计思想，不仅简化了伺服机构，对跟踪伺服机构的设计提供了新思路，而且对机器人设计及其他工业领域机构设计都具有一定的参考价值。
