Arrangement for sensing the geometric characteristics of an object
US4202612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1978 |
| Grant date | May 13, 1980 |
| Priority date | — |
| Expiry date | Jun 6, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B15/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A plurality of projectors are positioned in spaced relationship about an object with a surface to be geometrically analyzed. The projectors have cooperating masks which project onto the object illuminated patterns that subdivide the object into predetermined sections. Each mask has a predetermined pattern of sections, and is applied in sequence. The masks are cooperatively advanced in the projectors, with a separate illuminating pattern prevailing on the object each time that the masks are advanced. The combinations of the patterns on the masks define closely-spaced sections subdividing the object. The patterns are coded so that each section is uniquely defined in coded form. Cameras having the entire object within their field of view, photograph the object each time a separate mask is applied. The patterns or sections are parallel planes projected through a mask onto the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.