Optical device for measuring speed
US6043869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1996 |
| Grant date | Mar 28, 2000 |
| Priority date | — |
| Expiry date | Sep 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/806
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for measuring the speed of an object. The device includes a spatial filter scheme to provide quick-response photodetectors and an efficient use of light. The device projects light onto the object by a light source 1, and the light reflected by the object is received by a lens. This light passes through aperture stop 4 and strikes prism array 7, where it is split alternately into two paths at a fixed pitch with respect to the optical axis. The two split beams are received respectively by two photodetectors. The speed of the object moving relative to the measuring device can be calculated based on the data collected by photodetectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.