Limited volume method and apparatus for particle counting
US4739171A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1985 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Oct 22, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for determining the presence of particles in a fluorescent dispersion which exceed either a predetermined fluorescence intensity or size are disclosed. The method and apparatus involve the irradiation of the dispersion with excitation light, the examination of the fluorescent light entering an optical fiber from a portion of the excited region small enough to permit only a low probability that more than one particle of interest is present in the volume during a predetermined period of time, and the measurement of the emitted fluorescence entering the fiber, substantially free of excitation light, to the extent that the fluorescence differs in intensity from that of the dispersion in the absence of the particle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.