Method and apparatus for taking distance images
US5526038A · kind A · utility
Inventor
Key dates
| Filing date | Feb 3, 1994 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Feb 3, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/89
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for producing distance images according to the principle of emitting a light signal and the time-delayed reception of the reflected light signal by a receiving device wherein at least two reflection images of the same distance range are taken, and the emitted light signal is intensity-modulated by a modulation frequency. When at least one of the two reflection images is taken, the sensitivity of the receiving device is modulated by the same modulation frequency and is fixed in-phase with respect to it. Subsequently, by a comparison of the light intensity values in the first and second reflection images, the reflectivity and the distance of the objects are determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.