Methods and systems for measuring speckle translation with spatial filters
US8913232B2 · kind B2 · utility
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Key dates
| Filing date | Nov 23, 2009 |
| Grant date | Dec 16, 2014 |
| Priority date | — |
| Expiry date | Aug 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03549
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Two or more spatial filters are used in determining velocity based on speckle translation. A light source may be turned on, turned off, or both for a variable amount of time during operation. The velocity may then be determined with trend identification, correlation, recursive frequency estimation, or measurement bandwidth variation. A confidence level may also be calculated for the measured velocity, and the measured velocity reported or used only when the calculated confidence level meets or exceeds a given value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.