Surface pit detection system and method
US4794265A · kind A · utility
74Cited by
5References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | May 8, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/9506
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for uniquely detecting pits on a smooth surface by irradiating an area of the surface; separately sensing radiation scattered from the surface in the near-specular region indicative of a pit and in the far-specular region indicative of a flaw and producing signals representative thereof; normalizing the near-specular signal with respect to the far-specular signal to indicate a pit; and discriminating the near-specular components of the normalized signal representative of surface pits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.