Particle measurement system
US5999256A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Apr 3, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/1434
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for particle size detection comprises passing particles in a fluid medium relative to a light source which generates a light field the optical axis of which is transverse to the direction of fluid movement relative to the said light source and having a plurality of non-interferometrically formed variations in intensity spaced along the direction of movement of the particles relative to the light field, detecting variations in light intensity caused by the particles as they pass through the variations in the light field, and measuring the size of a detected particle substantially independently of the optical characteristics of the particle by plotting the mean peak signal as a function of the normalised peak-to-trough variation in the output pulses generated by the passages of the particle through the light field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.