Method for optical measurement of velocities according to the spatial frequency filtering method and sensor for optical measurement of velocities
US8355119B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 2008 |
| Grant date | Jan 15, 2013 |
| Priority date | — |
| Expiry date | Feb 1, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/68
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method for measuring a relative velocity between an object surface (O) and a sensor (1) having at least one light-sensitive element (2) according to the spatial frequency filtering method, wherein the light-sensitive element (2) is read out at time intervals, and wherein the spatial frequency filter is designed as at least one masking grating having a variable grating constant. The method according to the invention is characterized in that the relative velocity is firstly measured with a first grating constant k1 having a large period length and/or over a short observation time period t1 (rough measurement) and then the measurement of the relative velocity is repeated for an exact determination using a second grating constant k2 having a small period length and/or over a long observation time period t2 (fine measurement). The invention further relates to a sensor for velocity measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.