LiDAR detection systems and methods that use multi-plane mirrors
Embodiments discussed herein refer to a relatively compact and energy efficient LiDAR system that uses a multi-plane mirror in its scanning system.
1. A light detection and ranging (LiDAR) system for use with a vehicle, comprising:
a transmitter comprising:
a plurality of semiconductor based light emitters configured to generate light energy, and
a lens group,
wherein the lens group is configured to collimate the generated light energy to obtain collimated light energy and to direct the collimated light energy along a plurality of different angles, the combination of the plurality of different angles forming at least a part of a vertical angle range of a field of view of the LiDAR system;
a receiver configured to receive light energy reflected from an object within the field of view of the LiDAR system;
a polygon structure that defines a horizontal angle range of the field of view of the LiDAR system; and
one or more mirrors configured to redirect light energy passing between the transmitter and the polygon structure, and to redirect light energy passing between the polygon structure and the receiver, wherein a position of one of the one or more mirrors is translatable in a manner that results in an increase of scan resolution of at least a part of the field of view of the LiDAR system.
2. The LiDAR system of claim 1 , wherein the one or more mirrors comprise at least one fixed or moveable mirror.
3. The LiDAR system of claim 2 , wherein the one or more mirrors move in a rotating manner.
4. The LiDAR system of claim 1 , wherein the plurality of semiconductor based light emitters generate laser pulses sequentially or simultaneously.
5. The LiDAR system of claim 1 , wherein the plurality of different angles are non-overlapping.
6. The LiDAR system of claim 1 , wherein a gap exists in between each of the plurality of different angles, and wherein the one or more mirrors are configured to redirect light energy in a manner that accounts for the gap in between each of the plurality of different angles.
7. The LiDAR system of claim 1 , wherein no gap exists in between each of the plurality of different angles.
8. The LiDAR system of claim 1 , wherein the receiver comprises a detector group, the detector group comprising at least one detection circuit for each of the plurality of different angles.
9. The LiDAR system of claim 8 , wherein the detector group comprises a plurality of detector subgroups, each of the plurality of detector subgroups configured to cover returning angles from each lens in the lens group.
10. The LiDAR system of claim 1 , wherein the polygon structure is configured to rotate about an axis in a first direction at a substantially constant speed.
11. The LiDAR system of claim 10 , wherein the rotation axis is coincident to or different to the symmetric axis of the polygon structure.
12. The LiDAR system of claim 1 , wherein the polygon structure is masked.
13. The LiDAR system of claim 1 , wherein the polygon structure is trimmed to include chamfers to improve operation.
14. The LiDAR system of claim 1 , further comprising housing to house the transmitter system, the receiver system, the polygon structure, and the one or more mirrors, wherein the housing is configured to be mounted to a windshield or other structure on the vehicle.
15. A method for using a LiDAR system comprising a transmitter, a receiver, a polygon structure, and one or more mirrors, the transmitter comprising a plurality of semiconductor based light emitters and a lens group, the method comprising:
generating, by the plurality of semiconductor based light emitters, light energy;
collimating, by the lens group, the generated light energy to obtain collimated light energy;
directing, by the lens group, the collimated light energy along a plurality of different angles, the combination of the plurality of different angles forming at least a part of a vertical angle range of a field of view of the LiDAR system;
defining, by the polygon structure, a horizontal angle range of the field of view of the LiDAR system;
redirecting, by the one or more mirrors, light energy passing between the transmitter and the polygon structure, and light energy passing between the polygon structure and the receiver, wherein a position of one of the one or more mirrors is translatable in a manner that results in an increase of scan resolution of at least a part of the field of view of the LiDAR system; and
receiving, by the receiver, light energy reflected from an object within the field of view of the LiDAR system.
16. The method of claim 15 , wherein the one or more mirrors comprise at least one fixed or moveable mirror.
17. The method of claim 15 , wherein generating, by the plurality of semiconductor based light emitters, light energy comprises generating laser pulses sequentially or simultaneously.
18. The method of claim 15 , wherein a gap exists in between each of the plurality of different angles, and wherein the one or more mirrors are configured to redirect light energy in a manner that accounts for the gap in between each of the plurality of different angles.
19. The method of claim 15 , wherein the receiver comprises a detector group, the detector group comprising at least one detection circuit for each of the plurality of different angles.
20. The method of claim 19 , wherein the detector group comprises a plurality of detector subgroups, each of the plurality of detector subgroups configured to cover returning angles from each lens in the lens group.