Optical particle sensor
US11092531B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2017 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Apr 29, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A90/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention describes a laser sensor module. The laser sensor module comprises at least a first laser (111) being adapted to emit a first measurement beam (111′) and at least a second laser (112) being adapted to emit a second measurement beam (112′). The laser sensor module further comprises an optical device (150) being arranged to redirect the first measurement beam (111′) and the second measurement beam (112′) such that the first measurement beam (111′) and the second measurement beam enclose an angle between 45° and 135°. The laser sensor module comprises one detector (120) being adapted to determine at least a first self-mixing interference signal of a first optical wave within a first laser cavity of the first laser (111) and at least a second self-mixing interference signal of a second optical wave within a second laser cavity of the second laser (112). This configuration enables determination of an average velocity of the particles despite of the fact that it is not possible to determine the components of the velocity vector. The introduced error by means of statistical variations is acceptable because the number of detected particles scales with the cubic root of the pa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.