大型回转体空间异面直线角度光电检测系统研究

Research on photoelectric system for space bifacial straight line a ngle measurement of large rotors

摘要:

为实现大型回转体空间异面直线角度的自动精确 测量,以激光模组为光源,以精密位置测试传感 器象限探测器为敏感探测器件,以精密电控转台、多维调节结构为辅助装置,构建了测量系 统。通过调节,保证激光 出射光路与回转体轴线平行及电控转台轴心与回转体轴线重合。采用公共基准将异面角度映 射到同一平面, 两象限探测器分别安装于空间异面待测点,其坐标原点与待测点重合。电动转台控制激光光 束先后扫描象 限探测器坐标原点,光电转换并调理后获得起、止位置信号。最后,通过数据采集和处理, 获得空间异面直线角 度。在自然照明条件下,对空间角为5°的标准大型回转体进行了自动和手动两种模式的 重复实验。实验 结果表明,系统在自动模式下的绝对误差均值Δ′为0.005,满足了实际工程对大型回转体空间异面角度的精 度需求。

Abstract:

In order to achieve the automatic accurate measurement of space bifaci al straight line angle for large rotary body,taking the laser module as the radiation source,using the precise location testing sensor quadrant detector as sensiting device,holding the precision electric turntable and multi -dimensional adjustment structure as the auxiliary device,the measurement system is built up.By means of the parallel ism of laser light path and the axis of revolving body are ensured,the coincidence of the axis of e lectric tur ntable and the rotary body.Arranging the two-quadrant detectors in different planes to be measured respectively,the origin of coordinates and the measured point are coincident.Laser beams scan the coordinate origin of qua drant detectors successively under the control of turntable.Through the photoelectric conversion,we can get t he position signals of beginning and ending.Finally,data acquisition device collects the beginning and ending signals ,then we can get the space angle after computer processing.In the natural lighting conditions,repeat the expe riment of the standard large rotary body whose space angle is 5° in the automatic and manual modes.Th e experimental results indicate that the absolute mean error (Δ′) is 0.0055° in automatic mode,which meets the precision requirements of spatial surface angle in practical engineering.The technique has wide application prosp ects and practical values.