罗克韦尔1746-OB16
扫描3D成像方法可分为扫描测距、主动三角法、色散共焦法等。
l扫描测距是利用一条准直光束通过一维测距扫描整个目标表面实现3D测量。典型扫描测距方法有:1)单点飞行时间法,如连续波频率调制(FM-CW)测距、脉冲测距(激光雷达)等;2)激光散射干涉法,如基于多波长干涉、全息干涉、白光干涉、散斑干涉等原理的干涉仪;3)共焦法,如色散共焦、自聚焦等。单点测距扫描3D方法中,单点飞行时间法适合远距离扫描,测量精度较低,一般在毫米量级。其他几种单点扫描方法有:单点激光干涉法、共焦法和单点激光主动三角法,测量精度较高,但前者对环境要求高;线扫描精度适中,效率高。比较适合于机械手臂末端执行3D测量的应是主动激光三角法和色散共焦法。
l主动三角法是基于三角测量原理,利用准直光束、一条或多条平面光束扫描目标表面完成3D测量的。光束常采用以下方式获得:激光准直、圆柱或二次曲面柱形棱角扩束,非相干光(如白光、LED光源)通过小孔、狭缝(光栅)投影或相干光衍射等。主动三角法可分为三种类型:单点扫描、单线扫描和多线扫描。如图,从左至右依次是单点扫描、单线扫描和多线扫描。
1746-OB16
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