Noncontacting Laser Vibrometer for Six Degrees of Freedom Positional Measurement

本研究的目的是开发一种非接触式的微型机械构件全部六自由度位置和姿态的完整动态测量系统。这种信息通常是无法获得的，但它在许多新的工程应用中是必不可少的。该系统基于监测从组件上的一个小反射目标反射的三束激光。通过利用光束的几何原点和相应反射的位置，可以确定目标的所有六个自由度的位置。该研究将优化激光器、靶标和传感器的几何形状，以便在实现整体尺寸小型化的同时获得最佳的操作参数集。将开发必要的硬件和软件，以实现高频实时操作(30 KHz)。将对设计进行原型设计和评估，以确定操作限制和能力。主要的研究重点将放在系统开发上，并针对结构的非接触式模态分析进行应用。具体地说，将使用该系统提供的新测量功能来检查将旋转自由度纳入实验模态数据库的情况。

The objective of this research is to develop a noncontacting system for the complete dynamic measurement of all six degrees of freedom of position and attitude of miniature mechanical components. This information is generally not obtainable, yet it is essential in many new engineering applications. The system is based on monitoring three laser beams reflected from a small reflective target on the component. By utilizing the geometric origin of the beams and the position of the respective reflections, all six degrees of freedom of position of the target can be determined. The research will optimize the geometry of the lasers, targets, and sensors in order to achieve the best set of operational parameters while miniaturizing the overall size. The necessary hardware and software will be developed to achieve high frequency real time operation (30 KHz). The design will be prototyped and evaluated to determine the operational limitations and capabilities. The main research emphasis will be on system development, with applications directed at noncontacting modal analysis of structures. Specifically the incorporation of the rotational degrees of freedom into the experimental modal data base will be examined using the new measurement capability presented by this system.