Quasi bright field particle sensor
US5606418A · kind A · utility
6Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1995 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Mar 29, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/21
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A structure and a method provide a quasi bright field particle sensor, using a laser beam of predetermined polarization. A phase shift caused by a particle passing through a laser beam is utilized to detect the presence of a particle. In one embodiment, the laser beam is split into two components of laser beams of orthogonal polarization separated by a predetermined distance, so as to allow detection of both spherical and non-spherical particles. In another embodiment, where only non-spherical particles are detected, a single laser beam is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.