Process and device for optically measuring the distance and the velocity of a target
US4928152A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1987 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Feb 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/34
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for optically measuring the distance of a target (20) comprising a monomode coherent light source (18) means (18a, 21, 30) for periodically varying the wavelength of the light of the source, a photodetector (19) for detecting the variation in the wavelength between the light from the source (18) and that retroradiated by the target (20), and means (23, 24, 25; 33, 34, 35; 41, 43, 46) for processing the output signal of the photodetector (19) corresponding to the composite optical signal issuing from the cavity of the source of light and resulting from the re-injection into this cavity of the light retroradiated by the target (20), the frequency of the output signal of the photodetector being representative of the distance between the source (18) and the target (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.