Diffractive optical element in a lidar system to correct for backscan
US10061019B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2017 |
| Grant date | Aug 28, 2018 |
| Priority date | — |
| Expiry date | Oct 10, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/931
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To detect return light pulses in a lidar system when scanning in the forward-scanning and reverse-scanning directions, a light source may transmit first light pulses having a first wavelength when scanning in the forward-scanning direction and may transmit second light pulses having a second wavelength when scanning in the reverse-scanning direction. A diffractive optical element (DOE) is configured to deflect the two wavelengths in opposite directions, so that light pulses are transmitted ahead of the field of view of the detector in the scanning direction of the lidar system. A controller may determine the scanning direction of a scanner in the lidar system and transmit a control signal to a light source indicative of a wavelength that corresponds to the scanning direction. The light source may then transmit light pulses at the requested wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.