Variable angle polygon for use with a LiDAR system

Patent metadata

Field	Value
Publication number	US-11977185-B1
Application number	US-202016837429-A
Country	US
Kind code	B1
Filing date	Apr 1, 2020
Priority date	Apr 4, 2019
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

Embodiments discussed herein refer to variable geometry multi-faceted polygon for use with a LiDAR system and methods for the use thereof.

First claim

What is claimed is:

1. A LiDAR system, comprising:
a laser subsystem configured to emit an array of light beams comprising a plurality of light beams; and
a variable angle multi-facet polygon (VAMFP) configured to redirect the array of light beams to a field of view (FOV), the VAMFP comprising a plurality of facets each having a facet angle, wherein the facet angle of each of the plurality of facets corresponds to a different band of a plurality of bands within the FOV, wherein an inter-beam spacing (IBS) of the plurality of light beams is associated with the plurality of bands,
wherein the IBS of the plurality of light beams is selected such that the IBS of at least two of the plurality of light beams are equidistant, and dimensions and the facet angle of each of the plurality of facets are selected such that a spacing of the at least two light beams in at least two bands of the associated plurality of bands are uniformly distributed within the at least two bands and the plurality of bands are bounded by at least one boundary edge, wherein a boundary edge of a band in the plurality of bands is defined by a boundary edge of a corresponding facet of the plurality of facets, and
wherein the plurality of bands comprises at least three contiguous bands, a first band above the at least three contiguous bands, and a second band below the at least three contiguous bands, both the first band and the second band are non-contiguous to the at least three contiguous bands.

2. The LiDAR system of claim 1 , wherein at least two of the plurality of different bands overlap each other.

3. The LiDAR system of claim 1 , wherein the laser subsystem comprises an array of diode lasers that outputs the array of light beams.

4. The LiDAR system of claim 1 , wherein the laser subsystem comprises:
a fiber laser configured to output a single light beam; and
a splitter configured to receive the single light beam and output the array of light beams.

5. The LiDAR system of claim 1 , wherein the VAMFP comprises:
a multi-sided polygon; and
a plurality of wedge segments secured to the multi-sided polygon, wherein the plurality of wedge segments forms the plurality of facets.

6. The LiDAR system of claim 1 , wherein the array of light beams comprises a plurality of light beams that are spaced equidistantly apart from each other.

7. The LiDAR system of claim 1 , wherein the VAMFP is configured to rotate about a rotation axis, wherein rotation of the VAMFP enables the VAMFP to direct the array of light beams across two directions of the FOV.

8. The LiDAR system of claim 7 , further comprising a motor configured to rotate the VAMFP about the rotation axis.

9. A LiDAR system scanning component, comprising:
a variable angle multi-facet polygon comprising a plurality of facets each having a different facet angle, wherein each facet is configured to redirect any light beam of a plurality of light beams that interacts therewith to a plurality of bands, within a LiDAR system field of view (FOV), corresponding to the facet angle associated to that particular facet, wherein the facet angle of each of the plurality of facets corresponds to a different band of a plurality of bands within the FOV, wherein an inter-beam spacing (IBS) of the plurality of light beams is associated with the plurality of bands, and
wherein the IBS of the plurality of light beams is selected such that the IBS of at least two of the plurality of light beams are equidistant, and dimensions and the facet angle of each of the plurality of facets are selected such that a spacing of the at least two light beams in at least two bands of the associated plurality of bands are uniformly distributed within the at least two bands and the plurality of bands are bounded by at least one boundary edge, wherein a boundary edge of a band in the plurality of bands is defined by a boundary edge of a corresponding facet of the plurality of facets, and
wherein the plurality of bands comprises at least three contiguous bands, a first band above the at least three contiguous bands, and a second band below the at least three contiguous bands, both the first band and the second band are non-contiguous to the at least three contiguous bands.

10. The LiDAR system scanning component of claim 9 , wherein the variable angle multi-facet polygon is machined.

11. The LiDAR system scanning component of claim 9 , wherein the variable angle multi-facet polygon comprises:
a multi-sided polygon; and
a plurality of wedge segments secured to the multi-sided polygon, wherein the plurality of wedge segments forms the plurality of facets.

12. The LiDAR system scanning component of claim 9 , wherein the plurality of facets comprises five or six facets.

13. A method for directing light pulses to a field of view (FOV) of a LiDAR system, comprising:
emitting, from a laser subsystem, an array of light beams comprising a plurality of light beams; and
redirecting the array of light beams by a variable angle multi-facet polygon (VAMFP) to the FOV, the VAMFP comprising a plurality of facets each having a facet angle, wherein the facet angle of each of the plurality of facets corresponds to a different band of a plurality of bands within the FOV, wherein an inter-beam spacing (IBS) of the plurality of light beams is associated with the plurality of bands, and
wherein the IBS of the plurality of light beams is selected such that the IBS of at least two of the plurality of light beams are equidistant, and dimensions and the facet angle of each of the plurality of facets are selected such that a spacing of the at least two light beams in at least two bands of the associated plurality of bands are uniformly distributed within the at least two bands and the plurality of bands are bounded by at least one boundary edge, wherein a boundary edge of a band in the plurality of bands is defined by a boundary edge of a corresponding facet of the plurality of facets, and
wherein the plurality of bands comprises at least three contiguous bands, a first band above the at least three contiguous bands, and a second band below the at least three contiguous bands, both the first band and the second band are non-contiguous to the at least three contiguous bands.

14. The method of claim 13 , further comprising:
receiving return signals from the FOV via the VAMFP; and
processing the received return signals.

15. The method of claim 13 , further comprising rotating the VAMFP about a rotation axis.

Assignees

• Innovusion Ireland Ltd
• Seyond Inc

Inventors

• Wang Haosen
• Li Yimin

Classifications

• G01S17/10

  using transmission of interrupted, pulse-modulated waves (determination of distance by phase measurements G01S17/32) · CPC title

• G01S17/42

  Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) · CPC title

• G01S17/89

  for mapping or imaging · CPC title

• G01S17/931

  of land vehicles · CPC title

• G01S7/4815 Primary

  using multiple transmitters · CPC title