LOW COST SMALL SIZE LIDAR FOR AUTOMOTIVE

• US 20150219764A1
• Filed: 02/03/2015
• Published: 08/06/2015
• Est. Priority Date: 02/06/2014
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Lipson, Ariel
• Granted Patent: US 9,831,630 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01S 17/36 with phase comparison between the received signal and the contemporaneously transmitted signal
• CPC Class Codes: G01S 17/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S17/46
• CPC Class Codes: G01S 17/89 for mapping or imaging
• CPC Class Codes: G01S 17/931 of land vehicles
• CPC Class Codes: G01S 7/4815 using multiple transmitters
• CPC Class Codes: H01S 5/00 Semiconductor lasers superluminescent diodes H01L33/00

Abstract

A LiDAR sensor having particular application for use on a vehicle. The LiDAR sensor includes a plurality of spaced apart VCSEL arrays each including a single lens, where the lens for each VCSEL array directs the beam of the particular laser in the array that is illuminated in a desired direction so that turning on and off of the lasers in each array creates a scanning effect. The number and the size of the VCSEL arrays are selected to provide the desired FOV for the sensor, where the VCSEL arrays can be positioned on a curved platform to provide that FOV. The sensor also includes one or more detectors for detecting reflections of the laser beams emitted by the lasers. Control electronics are provided to scan the laser beams and generate a three-dimensional point cloud of return image points.

Claims

1. A LiDAR sensor comprising a plurality of vertical cavity surface emitting laser (VCSEL) arrays each including a plurality of VCSELs, said sensor further including a separate lens positioned proximate each VCSEL array that receives and focuses a laser beam from each VCSEL in the particular array.

2. The sensor according to claim 1 wherein the sensor is configured to be used on an automobile.

3. The sensor according to claim 1 wherein the sensor has a 180°

field-of-view.

4. The sensor according to claim 1 wherein the plurality of VCSEL arrays is nine VCSEL arrays.

5. The sensor according to claim 1 further comprising a camera having a same field-of-view as the VCSEL arrays.

6. The sensor according to claim 1 further comprising a semi-circular housing on which the plurality of VCSEL arrays are mounted.

7. The sensor according to claim 1 further comprising a detector assembly for detecting reflected beams reflected from objects that receive the laser beams.

8. The sensor according to claim 7 wherein the detector assembly includes a plurality of spaced apart detectors, where each detector includes a lens.

9. The sensor according to claim 7 wherein the detector assembly is part of a receiver including receiver electronics, said receiver electronics identifying a phase shift between the laser beams and the reflected beams for object range finding to determine the distance of the objects from the sensor.

10. The sensor according to claim 9 wherein the sensor includes emitter electronics that amplitude modulate the laser beams for the range finding.

11. The sensor according to claim 9 further comprising an optical device that provides a sample beam from the VCSEL arrays, said detector assembly including a reference detector that receives the sample beam and a main detector that receives the reflected beam, said receiver electronics using the sample beam and the reflected beam to determine the phase shift between the laser beam and the reflected beam.

12. An automotive LiDAR sensor comprising:

a plurality of vertical cavity surface emitting laser (VCSEL) arrays each including a plurality of VCSELs;

a separate lens positioned proximate each VCSEL array that receives and focuses a laser beam from each VCSEL in the particular array;

a detector assembly for detecting reflected beams reflected from objects that receive the laser beams; and

receiver electronics responsive to the reflected beams and identifying a phase shift between the laser beams and the reflected beams for object range finding to determine the distance of the objects from the sensor.

13. The sensor according to claim 12 further comprising an optical device that provides a sample beam from the VCSEL arrays, said detector assembly including a reference detector that receives the sample beam and a main detector that receives the reflected beam, said receiver electronics using the sample beam and the reflected beam to determine the phase shift between the laser beam and the reflected beam.

14. The sensor according to claim 12 wherein the sensor includes emitter electronics that amplitude modulate the laser beams for the range finding.

15. The sensor according to claim 12 wherein the sensor has a 180°

field-of-view.

16. The sensor according to claim 12 further comprising a camera having a same field-of-view as the VCSEL arrays.

17. The sensor according to claim 12 further comprising a semi-circular housing on which the plurality of VCSEL arrays are mounted.

18. A LiDAR sensor comprising:

a semi-circular housing;

an emitter including a plurality of vertical cavity surface emitting laser (VCSEL) arrays mounted on the housing each including a plurality of VCSELs and a separate lens positioned proximate each VCSEL array that receives and focuses a laser beam from each VCSEL in the particular array; and

a receiver including a detector assembly for detecting reflected beams reflected from objects that receive the laser beams, said receiver further including receiver electronics responsive to the reflected beams and identifying a phase shift between the laser beams and the reflected beams for object range finding to determine the distance of the objects from the sensor, wherein the sensor has a 180°

field-of-view.

19. The sensor according to claim 18 further comprising an optical device that provides a sample beam from the VCSEL arrays, said detector assembly including a reference detector that receives the sample beam and a main detector that receives the reflected beam, said receiver electronics using the sample beam and the reflected beam to determine the phase shift between the laser beam and the reflected beam.

20. The sensor according to claim 18 wherein the emitter includes emitter electronics that amplitude modulate the laser beams for the range finding.

21. The sensor according to claim 18 further comprising a camera having a same field-of-view as the VCSEL arrays.