Optical inspection method and apparatus utilizing a variable angle design
US6366352B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1999 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Jun 10, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/94
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for optical inspection of an article are presented. The apparatus comprises an illumination unit and at least one detection unit. The illumination unit generates an incident beam and directs it onto a predetermined region of the article. The detection unit includes a light collection system and a detector. The light collection system collects light scattered from the illuminated region with a predetermined constant maximum collection angle, and utilizes a variable angle design for selectively selecting from collected light at least one light component propagating with a solid angle segment of the maximum collection angle, and directing it to the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.