Processing

Please wait...

Settings

Settings

Goto Application

1. WO2018134618 - HOLOGRAPHIC LIGHT DETECTION AND RANGING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1. A light detection and ranging, "LIDA ", system arranged to scan a scene, the system

comprising:

a light source arranged to output light having a first characteristic;

a spatial light modulator, "SLM", arranged to receive the light from the light source and output spatially-modulated light in accordance with computer-generated holograms represented on the spatial light modulator;

a holographic controller arranged to output a plurality of computer-generated holograms to the spatial light modulator, wherein each computer-generated hologram is arranged to form a corresponding light footprint within the scene and the holographic controller is further arranged to change the position of the light footprint within the scene; and

a light detector arranged to receive light having the first characteristic from the scene and output a light response signal.

2. A LIDAR system as claimed in claim 1, wherein the plurality of computer-generated

holograms comprise a first plurality of computer-generated holograms arranged to provide a first scan within the scene, and wherein the holographic controller is arranged to receive the light response signal in response to the first scan and determine a second plurality of computer-generated holograms based on a property of the light response signal in response to the first scan.

A LIDAR system as claimed in claim 2 wherein the second plurality of computer-generated holograms are arranged to provide a second scan within the scene.

A LIDAR system as claimed in claim 3 wherein the first scan is a scan of a first area of the scene and the second scan is a scan of a second area of the scene.

A LIDAR system as claimed in claim 3 or 4 wherein the first scan is a scan in a first direction of the first area of the scene and the second scan is a scan in a second direction of the first area of the scene.

6. A LIDAR system as claimed in any of claims 2 to 5 wherein the first plurality of computer- generated holograms are arranged to form a first light footprint having a first area and the second plurality of computer-generated holograms are arranged to form a second light footprint having a second area, wherein the first area is not equal to the second area.

7. A LIDAR system as claimed in claim 6 wherein the first light footprint has a substantially one- dimensional shape extending in a second direction and the second light footprint has a substantially one-dimensional shape extending in a first direction.

8. A LIDAR system as claimed in claim 1 wherein the plurality of computer-generated

holograms comprise a first computer-generated hologram arranged to form a first light footprint at a first position in the scene and a second computer-generated hologram arranged to form a second light footprint at a second position in the scene, wherein output of the second computer-generated hologram immediately follows output of the first computer-generated hologram.

9. A LIDAR system as claimed in claim 8 wherein the first position is spatially separated from the second position.

10. A LIDAR system as claimed in claim 9 wherein the first position is substantially adjacent the second position.

11. A LIDAR system as claimed in any of claims 8 to 10 wherein the light footprint is continuously repositioned so as to scan the light footprint within the scene.

12. A LIDAR system as claimed in any of claims 8 to 11 wherein the first light footprint has a first area and the second light footprint has a second area, wherein the first area is not equal to the second area.

13. A LIDAR system as claimed in any of claims 8 to 12 wherein the first light footprint has a first shape and the second light footprint has a second shape, wherein the first shape is different to the second shape.

14. A LIDAR system as claimed in any of claims 8 to 13 wherein the first light footprint has a shape having a first orientation and the second light footprint has a shape having a second orientation, wherein the first orientation is different to the second orientation.

15. A LIDAR system as claimed in claim 14 wherein the shape is a substantially one-dimensional shape.

16. A LIDAR system as claimed in claim 14 or 15 wherein the first orientation is perpendicular to the second orientation.

17. A LIDAR system as claimed in any preceding claim wherein each computer-generated

hologram is a phase-only hologram.

18. A LIDAR system as claimed in any preceding claim wherein the spatially modulated light output by the SLM is encoded with a code that is unique to the LIDAR system.

19. A LIDAR system as claimed in claim 18 wherein the spatially modulated light output by the SLM is encoded by modulation of the light amplitude.

20. A LIDAR system as claimed in any preceding claim comprising first and second light sources configured to output light of different wavelengths to the SLM.

21. A LIDAR system as claimed in claim 20 wherein one of the first and second light sources is selected based on ambient conditions.

22. A LIDAR system as claimed in any preceding claim wherein the light footprint, or a

parameter or element associated with the plurality of computer-generated holograms that form the light footprint, is determined based on a received signal.

23. A LIDAR system as claimed in claim 22 wherein the received signal provides an indication of at least one of: vehicle speed; ambient conditions; weather conditions; traffic conditions and other driving parameters.

24. A LIDAR system as claimed in any preceding claim wherein the light footprint, or the

parameter or element associated with the plurality of computer-generated holograms that form the light footprint, is determined based on a distance range.

25. A LIDAR system as claimed in claim 24 wherein the light footprint, or the parameter

associated with the plurality of computer-generated holograms that form the light footprint, is determined so as to focus the light footprint at a distance corresponding to a distance range.

26. A LIDAR system as claimed in claim 24 or 25 wherein the distance range is selected based on at least one of: vehicle speed; ambient conditions; weather conditions; traffic conditions and other driving parameters.

27. A LIDAR system as claimed in any preceding claim further comprising an angular

magnification system arranged to magnify the angular deflection of the spatially-modulated light from the spatial light modulator.

28. A LIDAR system as claimed in claim 27 wherein the angular magnification system is arranged to refract the spatially-modulated light.

29. A LIDAR system as claimed in claim 27 or 28 wherein the angular magnification system is arranged to receive the spatially modulated light at a first angle and output the spatially modulated light at a second angle, wherein the second angle is greater than the first angle.

30. A LIDAR system as claimed in any preceding claim wherein the first characteristic is

amplitude modulation at a first frequency.

31. A LIDAR system as claimed in any preceding claim wherein the light is pulsed.

32. A LIDAR system as claimed in any preceding claim wherein the spatial light modulator is a liquid crystal on silicon, "LCOS", spatial light modulator.

33. A LIDAR system as claimed in any preceding claim wherein each computer-generated

hologram comprises first holographic data defining the size and shape of the light footprint and second holographic data defining the position of the light footprint in the scene.

34. A LIDAR system as claimed in any preceding claim wherein the first holographic data

comprises a lensing function.

35. A LIDAR system as claimed in any preceding claim wherein the second holographic data comprises a grating function.

36. A LIDAR system as claimed in any preceding claim further comprising a processor arranged to determine a distance of an object in the scene from the LIDAR system by measuring a time difference between output of first spatially-modulated light, corresponding to a first computer-generated hologram of the plurality of computer-generated holograms, and detection of first spatially-modulated light reflected from the object.

37. A LIDAR system as claimed in any preceding claim wherein the light detector comprises one of: a single light detecting element or an array of light detecting elements.

38. A LIDAR system as claimed in any preceding claim wherein at least one of the SLM and the light detector is located within a lamp unit of a portable device or vehicle.

39. A lamp unit comprising the LIDAR system of any preceding claim.

40. A vehicle comprising the LIDAR system of any preceding claim.