Compact lidar systems for vehicle contour fitting
An apparatus of a light detection and ranging (LiDAR) scanning system for at least partial integration with a vehicle is disclosed. The apparatus comprises an optical core assembly including an oscillating reflective element, an optical polygon element, and transmitting and collection optics. The apparatus includes a first exterior surface at least partially bounded by at least a first portion of a vehicle roof or at least a portion of a vehicle windshield. A surface profile of the first exterior surface aligns with a surface profile associated with at least one of the first portion of the vehicle roof or the portion of the vehicle windshield. A combination of the first exterior surface and the one or more additional exterior surfaces form a housing enclosing the optical core assembly including the oscillating reflective element, the optical polygon element, and the transmitting and collection optics.
1. An apparatus of a light detection and ranging (LiDAR) scanning system for at least partial integration with a vehicle, the apparatus comprising:
an optical core assembly including an oscillating reflective element, an optical polygon element, and transmitting and collection optics, wherein the oscillating reflective element is positioned at a lower position compared with an optic axis of transmission light beams directed by the optical polygon element, at least a portion of the optical polygon element is positioned above a vehicle roof line, and at least a portion of the oscillating reflective element and the transmitting and collection optics is positioned below the vehicle roof line;
a first exterior surface at least partially bounded by at least a first portion of a vehicle roof or at least a portion of a vehicle windshield, wherein a surface profile of the first exterior surface aligns with a surface profile associated with at least one of the first portion of the vehicle roof or the portion of the vehicle windshield; and
one or more additional exterior surfaces, wherein a combination of the first exterior surface and the one or more additional exterior surfaces form a housing enclosing the oscillating reflective element, the optical polygon element, and the transmitting and collection optics.
2. The apparatus of claim 1 , wherein the optical core assembly is positioned proximate to a middle position between two A-pillars of the vehicle.
3. The apparatus of claim 1 , wherein the surface profile of the first exterior surface comprises a sloped or curved portion that aligns with a sloped or curved portion of the surface profile associated with at least one of the first portion of the vehicle roof or the portion of the vehicle windshield.
4. The apparatus of claim 1 , wherein the one or more additional exterior surfaces further comprise a second exterior surface having a surface profile that at least partially aligns with a surface profile of a second portion of the vehicle roof.
5. The apparatus of claim 4 , wherein the surface profile of the second exterior surface comprises a substantially planar portion that aligns with a substantially planar portion of the surface profile of the second portion of the vehicle roof.
6. The apparatus of claim 4 , wherein an amount of elevation difference between the second exterior surface and the second portion of the vehicle roof is less than or equal to approximately 50 mm.
7. The apparatus of claim 1 , wherein the lateral dimensions of at least one of the oscillating reflective element, the optical polygon element, and the transmitting and collection optics are configured to be greater than or equal to 150% of height dimensions of the same element.
8. The apparatus of claim 1 , wherein the housing has a tapered profile from a forward-facing end of the housing to a rear-facing end of the housing.
9. The apparatus of claim 8 , wherein the oscillating reflective element is disposed in a first inner portion of the housing, the first inner portion of the housing being proximate to the forward-facing end of the housing, the oscillating reflective element being positioned proximate to the first exterior surface.
10. The apparatus of claim 4 , wherein the optical polygon element is disposed proximate to the second exterior surface, the optical polygon element comprising a plurality of facets tilted with respect to a rotation axis of the optical polygon element.
11. The apparatus of claim 1 , wherein the transmitting and collection optics comprise a plurality of transmitter channels configured to deliver the transmission light beams to the oscillating reflective element.
12. The apparatus of claim 11 , wherein the transmitting and collection optics further comprise:
a collimation lens optically coupled to the plurality of transmitter channels to receive the transmission light beams; and
a collection lens disposed to receive and redirect returning light generated based on the transmission light beams.
13. The apparatus of claim 12 , further comprising an optical beam-shifting system optically coupled to the collimation lens, wherein the optical beam-shifting system redirects a plurality of collimated transmission light beams such that at least a part of the collimated transmission light beams is positioned within an optical receiving aperture of the collection lens.
14. The apparatus of claim 13 , wherein the optical beam-shifting system comprises one or more prisms, lenses, and mirrors configured to redirect a plurality of collimated transmission light beams such that the redirected collimated transmission light beams are substantially parallel to the collimated transmission light beams.
15. The apparatus of claim 13 , wherein the optical beam-shifting system comprises a periscope prism including two reflecting surfaces disposed substantially parallel to each other.
16. The apparatus of claim 11 , wherein the transmitting and collection optics further comprise a collection lens having an opening, wherein the plurality of transmitter channels is at least partially disposed in the opening to deliver the transmission light beams to the oscillating reflective element.
17. The apparatus of claim 16 , wherein the opening is positioned proximate to an edge of the collection lens and has a dimension configured based at least in part on an optical receiving aperture requirement.
18. The apparatus of claim 16 , wherein the collection lens has an asymmetric shape with a reduced height relative to a corresponding symmetrically shaped collection lens.
19. The apparatus of claim 18 , wherein the transmitting and collection optics further comprise a plurality of receiving channels disposed inside the housing at a position based on a focal length of the collection lens, wherein the collection lens comprises a first surface portion optically configured to direct light to the plurality of receiving channels.
20. The apparatus of claim 19 , wherein the collection lens further comprises a second surface portion and a third surface portion, wherein both the second surface portion and the third surface portion intersect with the first surface portion.
21. The apparatus of claim 20 , wherein the second surface portion is positioned proximate to the optical polygon element, and wherein an optical axis of the collection lens is closer to the second surface portion than to the third surface portion.
22. The apparatus of claim 19 , wherein the plurality of receiving channels is positioned proximate to the optical polygon element wherein a path of the plurality of receiving channels is configured to align with a tapered profile of the housing.
23. The apparatus of claim 19 , wherein the plurality of receiving channels is disposed proximate to the rear-facing end of the housing.
24. The apparatus of claim 11 , wherein the oscillating reflective element is configured to redirect the transmission light beams provided by the plurality of transmitter channels to the optical polygon element.
25. The apparatus of claim 1 , wherein a combination of the optical polygon element and the oscillating reflective element, when moving with respect to each other,
steers the transmission light beams both horizontally and vertically to illuminate one or more objects in a partial field-of-view of the LiDAR apparatus; and
obtains return light generated based on the illumination of the one or more objects.
26. The apparatus of claim 1 , wherein the optical polygon element has a height less than or equal to about 20 mm.
27. The apparatus of claim 1 , wherein the optical polygon element comprises a polygon motor positioned inside the optical polygon element.
28. The apparatus of claim 1 , wherein the optical core assembly further comprises a window forming a portion of the one or more additional exterior surfaces of the housing.
29. The apparatus of claim 28 , wherein the window is tilted at an angle configured based on at least one of: an orientation of the optical polygon element, an orientation of the oscillating reflective element, and an orientation of the transmitting and collection optics.
30. The apparatus of claim 1 , wherein the transmitting and collection optics comprise four or more transmitter channels and four or more receiving channels.