Dynamic light scattering at multiple discrete wavelengths, using multiple mono-mode fibres or for detecting the velocity of scattering sensors
US6459093B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 2000 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Jan 5, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dynamic light scattering apparatus comprises at least two lasers (11) of different wavelengths which illuminate the same volume (SV) of a fluid containing scattering or fluorescent centres. The scattered or fluoresced radiation is detected at each discrete wavelength and properties, such as the concentration of different particle sizes, of the volume (SV) are derived. The detection at multiple wavelengths allows the effects of multiple scattering to be overcome. Multiple volumes (SV) may be illuminated and detected simultaneously so as to measure the spatial variation of particle size concentration. The rotational diffusion constants of the particles may be measured from the depolarized component of scattered light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.