LIDAR system with reduced speckle sensitivity

Patent metadata

Field	Value
Publication number	US-11624810-B2
Application number	US-202016780871-A
Country	US
Kind code	B2
Filing date	Feb 3, 2020
Priority date	Feb 9, 2019
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

Multiple LIDAR output signals are generated and are concurrently directed to the same sample region in a field of view. The LIDAR output signals have one or more optical diversities selected from a group consisting of wavelength diversity, polarization diversity, and diversity of an angle of incidence of the LIDAR output signal relative to the sample region.

First claim

The invention claimed is:

1. A LIDAR system, comprising:
one or more LIDAR chips that generate multiple LIDAR output signals; and
electronics that operate the one or more LIDAR chips such that the LIDAR output signals are concurrently directed to the same sample region in a field of view and overlap at the sample region, the LIDAR output signals having one or more optical diversities selected from a group consisting of wavelength diversity, polarization diversity, and diversity of an angle of incidence of the LIDAR output signal relative to the sample region,
the electronics generating multiple different LIDAR data results for the sample region,
each of the LIDAR data results including the distance and/or radial velocity between the LIDAR system and the sample region, and
each of the different LIDAR data results being associated with a different one of the LIDAR output signals in that the electronics use light from the LIDAR output signal associated with the LIDAR data result to generate the LIDAR data result.

2. The LIDAR system of claim 1 , wherein the one or more LIDAR chips is one LIDAR chip that generates the multiple LIDAR output signals.

3. The LIDAR system of claim 1 , wherein the one or more LIDAR chips is multiple LIDAR chips that generate the multiple LIDAR output signals.

4. The LIDAR system of claim 1 , wherein the optical diversity is wavelength diversity.

5. The LIDAR system of claim 1 , wherein the optical diversity is polarization diversity.

6. The LIDAR system of claim 1 , wherein the optical diversity is diversity of the angle of incidence.

7. The LIDAR system of claim 1 , wherein the sample region is one of multiple sample regions in the field of view, the electronics being configured to sequentially direct the LIDAR output signals to a series of the sample regions such that the LIDAR output signals are concurrently directed to each of the sample regions and overlap at each of the sample regions.

8. The LIDAR system of claim 1 , wherein the LIDAR output signals have more than one of the optical diversities.

9. The LIDAR system of claim 1 , wherein the LIDAR output signals each travels to a focus as they travel away from the LIDAR system.

10. The LIDAR system of claim 1 , wherein the LIDAR output signals travel on the same optical pathway between the LIDAR chip and the sample region.

11. A method of operating a LIDAR system, comprising:
generating multiple LIDAR output signals;
concurrently directing the LIDAR output signals to a sample region in a field of view such that the LIDAR output signals have one or more optical diversities selected from a group consisting of wavelength diversity, polarization diversity, and diversity of an angle of incidence of the LIDAR output signal relative to the sample region; and
generating multiple different LIDAR data results for the sample region,
each of the LIDAR data results including the distance and/or radial velocity between the LIDAR system and the sample region, and
each of the different LIDAR data results being associated with a different one of the LIDAR output signals in that the electronics use light from the LIDAR output signal associated with the LIDAR data result to generate the LIDAR data result.

12. The method of claim 11 , wherein the LIDAR output signals exit from a LIDAR chip.

13. The method of claim 11 , wherein the LIDAR output signals exit from different LIDAR chips.

14. The method of claim 11 , wherein the optical diversity is wavelength diversity.

15. The method of claim 11 , wherein the optical diversity is polarization diversity.

16. The method of claim 11 , wherein the optical diversity is diversity of the angle of incidence.

17. The method of claim 11 , wherein the sample region is one of multiple sample regions in a field of view and further comprising:
sequentially directing the LIDAR output signals to a series of the sample regions such that the LIDAR output signals are concurrently directed to multiple sample regions in the series and overlap at each of the sample regions.

18. The method of claim 11 , wherein the LIDAR output signals have more than one of the optical diversities.

19. The method of claim 11 , wherein the LIDAR output signals each travel to a focus as they travel to the sample region.

20. The method of claim 11 , wherein LIDAR output signals exit from a LIDAR chip and the LIDAR output signals travel on the same optical pathway between the LIDAR chip and the sample region.

Assignees

• Silc Tech Inc

Inventors

• Luff Bradley Jonathan
• Feng Dazeng
• Asghari Mehdi

Classifications

• G01S7/4815 Primary

  using multiple transmitters · CPC title

• G01S7/484 Primary

  Transmitters · CPC title

• G01S7/499

  using polarisation effects · CPC title

• G01S17/58

  Velocity or trajectory determination systems; Sense-of-movement determination systems · CPC title

• G01S17/32

  using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated · CPC title