System employing preconditioned radiation for detecting defects in transparent objects
US4900916A · kind A · utility
7Cited by
6References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Mar 2, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/9515
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for inspecting transparent objects is disclosed. The apparatus employs preconditioned radiation to detect defects having small radii of curvature or other such highly refractive surfaces and discriminate them from desirable markings having larger radii of curvature. The apparatus comprises a radiation source, means for selecting angular spectrum ranges, means for modifying average angles of incidence, radiation detection means and processing means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.