Detecting inclusions in transparent sheets
US6388745B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2000 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Mar 29, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/0061
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This light scattering technique for size measurement is based on the fact that an illuminated particle (inclusion) serves as a secondary radiation source in a manner which is related to its size. This technique allows for detection of inclusions in the interior of transparent solid media, such as bulk glass. When illuminated with a beam of monochromatic light such as a laser beam as the primary light source, the angular distribution of the scattered intensity originated from the inclusion in the micron to submicron range, is a function of intensity, wavelength and index of refraction. A lens and light trap block the primary light for reaching a detector. The light trap, however, allows the secondary scattered light to reach the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.