公开(公告)号：US20050127271A1

公开(公告)日：2005-06-16

申请号：US11045675

申请日：2005-01-28

申请人： William Ortyn ,  Michael Seo ,  David Basiji ,  Keith Frost ,  David Perry

发明人： William Ortyn ,  Michael Seo ,  David Basiji ,  Keith Frost ,  David Perry

IPC分类号： G01N15/10 ,  G01N15/14 ,  G02B27/00 ,  G06T7/20 ,  G01N21/00 ,  G01N15/06 ,  G02B7/04

CPC分类号： G06T7/20 ,  G01N15/1459 ,  G01N15/1463 ,  G01N2015/1018 ,  G01N2015/1443 ,  G01N2015/1447 ,  G01N2015/1452 ,  G01N2015/1497 ,  G02B27/0012 ,  G06K9/00134

摘要： A pair of optical gratings are used to modulate light from an object, and the modulated light from either grating is used to determine the velocity of the object. Each optical grating is offset from a reference focal point by the same distance, one grating being offset in a positive direction, the other in a negative direction. Signals produced in response to the modulated light can be processed to determine a direction in which a primary collection lens should be moved in order to improve a focus of the imaging system on the object. The lens is moved incrementally in the direction so determined, and the process is repeated until an optimal focus is achieved. In a preferred embodiment, the signals are weighted, so that the optical grating disposed closest to the optimal focus position contributes the most to velocity detection.

摘要翻译： 一对光栅用于调制来自物体的光，并且来自任一光栅的调制光用于确定物体的速度。 每个光栅从参考焦点偏移相同的距离，一个光栅在正方向偏移，另一个光栅在负方向上偏移。 可以处理响应于调制光产生的信号以确定主收集透镜应该移动的方向，以便改善成像系统对物体的焦点。 透镜在如此确定的方向上逐渐移动，并重复该过程，直到达到最佳聚焦。 在优选实施例中，对信号进行加权，使得最靠近最佳聚焦位置布置的光栅最有助于速度检测。