Lidar sensor with orthogonal arrays

Patent metadata

Field	Value
Publication number	US-12181583-B1
Application number	US-202217712264-A
Country	US
Kind code	B1
Filing date	Apr 4, 2022
Priority date	Aug 18, 2017
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

A method for scanning a scene is disclosed. According to the method, light is transmitted by a transmitter through a transmitter surface grating array, as a first elliptical pattern in a first lateral direction. Light is received by a receiver through a receiver surface grating array, from an area of a second elliptical pattern. The received light is reflected from the first elliptical pattern. The first elliptical pattern is orthogonal to the second elliptical pattern. The first elliptical pattern overlaps with the second elliptical pattern.

First claim

What is claimed is:

1. A method for scanning a scene, the method comprising:
transmitting light, by a transmitter through a transmitter surface grating array, as a first elliptical pattern;
receiving light, by a receiver through a receiver surface grating array, from an area of a second elliptical pattern; wherein the area is defined by an overlap of the first elliptical pattern and the second elliptical pattern only; wherein the received light is a reflection of at least a portion of the transmitted light; and wherein the first elliptical pattern is orthogonal to the second elliptical pattern;
processing the received light to create a point cloud of a scene,
sending information of the received light to a digital signal processor (DSP);
processing, by the DSP, the information of the received light;
creating a point cloud of the scene the reflects the light;
recovering, by the DSP, magnitude and phase of the light received by the receiver surface grating array;
comparing a speed of interference fringes from a scanned object to a sweeping speed of the frequency-swept laser light; and
calculating, by the DSP, a distance to the scanned object in the scene based on the comparison of the speed of interference fringes from the scanned object to the sweeping speed of the frequency-swept laser light,

wherein an input to the transmitter is a frequency-swept laser light, and wherein at least a portion of the frequency-swept laser light is to act as an oscillator for the receiver.

2. The method of claim 1 wherein the transmitted light is coherent light.

3. The method of claim 1 further comprising:
steering the transmission of the light to cause reflection of different portions of a scene.

4. The method of claim 3 comprising:
adjusting phase shifters in the transmitter transmitting the light; and
steering transmission of the light based on the adjusted phase shifters.

5. The method of claim 1 further comprising:
processing the received light to determine a motion associated with a scanned object.

Assignees

• Acacia Communications Inc

Inventors

• Doerr Christopher
• Chen Long

Classifications

• G02B5/1866

  Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence) · CPC title

• G02B5/1819

  Plural gratings positioned on the same surface, e.g. array of gratings (plural diffractive elements positioned sequentially along the optical path G02B27/4272) · CPC title

• H01S5/141

  using a wavelength selective device, e.g. a grating or etalon (H01S5/146 takes precedence) · CPC title

• G02B26/10

  Scanning systems · CPC title

• G02B6/122

  Basic optical elements, e.g. light-guiding paths · CPC title