Binary optical grating and method for generating a

专利名称：Binary optical grating and method for

generating a moire pattern for 3D imaging

发明人：Franz W. Ulrich,John Ma,Darcy J. Hart申请号：US09598069申请日：20000620公开号：US06509559B1公开日：20030121

专利附图：

摘要：In the context of a machine-vision system for inspecting a part, a method andapparatus to provide high-speed high accuracy 3D (three-dimensional) inspection ofmanufactured parts by reducing vibration. The invention provides a method, a grating,

and a 3D imaging system using a binary grating in the projection system to generatepatterned light. The grating includes a binary grating having a cycle pattern, wherein eachcycle includes a first substantially clear stripe of a first width and a first substantiallyopaque stripe of substantially the same first width, and between the first substantiallyclear stripe and the first substantially opaque stripe are a second substantially opaquestripe of a second width narrower than the first width, and a second substantially clearstripe of substantially the second width. In some embodiments, a plurality of alternatingrelatively narrow clear and opaque stripes are positioned between the relatively widerfirst substantially clear stripe and first substantially opaque stripe, in order that theoptics of the projection optical system and the relative motion between the projectionlight pattern and the imaging time (trapezoidal integration) smooth the resulting patternto provide a linear sine-wave-like pattern of projection light.

申请人：PPT VISION, INC.

代理机构：Schwegman, Lundberg, Woessner & Kluth, P.A.

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