# US 11,029,398 B2 · Lidar system and method of operating the same

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- Number: US 11,029,398 B2
- Document ID: US11029398B2
- Status: Granted
- Kind: B2
- Application number: 15/888,537
- Filed: 2018-02-05
- Published: 2019-03-14
- Granted: 2021-06-08
- Earliest claimed: 2017-09-12
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Inoh Hwang; Dongjae Shin; Jungwoo Kim; Tatsuhiro Otsuka; Heesun Yoon
- Web page: https://patentgrep.com/patent/US11029398B2

## CPC

- G01S 7/4876: {by removing unwanted signals (G01S7/495 takes precedence)}
- G01S 7/4814: {of transmitters alone}
- G01S 7/4815: {using multiple transmitters}
- G01S 7/4817: {relating to scanning}
- G01S 17/06: Systems determining position data of a target
- G01S 17/42: Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

Light detection and ranging (LiDAR) systems and methods of operating the LiDAR systems are provided. The LiDAR system includes a light emitter configured to emit first lights of different wavelengths in a vertical direction and at different scanning angles with respect to a horizontal axis, a lens configured to converge second lights that are reflected from objects on which the first lights are emitted, and a light filter comprising an active-type device configured to adjust a transmission central wavelength of the active-type device to the different wavelengths of the first lights that are emitted from the light emitter. The LiDAR system further includes a controller configured to control an operation of the light emitter and the light filter, and a detector configured to detect light from the light emitter, and obtain information about the objects.

## Claims

### Claim 1

A light detection and ranging (LiDAR) system comprising:
a light emitter configured to emit first lights of different wavelengths in a vertical scan;
a lens configured to converge second lights that are reflected from objects on which the first lights are emitted;
a light filter comprising an active-type device configured to adjust a transmission central wavelength of the active-type device to the different wavelengths of the first lights are emitted from the light emitter;
a controller configured to:
set a wavelength of light to be emitted;
apply a light emission starting signal to the light emitter so that the light emitter emits the light of the set wavelength;
adjust the light transmission central wavelength of the light filter to the set wavelength;
in the vertical scan, detect whether a current scanning angle of the emitted light with respect to a horizontal axis of the light emitter is within a preset range;
based on the current scanning angle being detected to be within the preset range, maintain a present scanning state of the light emitter; and
based on the current scanning angle being detected to be outside the preset range, reset, to a new wavelength, the wavelength of the light to be emitted; and
a detector configured to detect the first lights emitted from the light emitter, and obtain information about the objects.

### Claim 2 (depends on 1)

The LiDAR system of claim 1, wherein the light emitter comprises an optical phased array light source.

### Claim 3 (depends on 1)

The LiDAR system of claim 1, wherein the active-type device comprises a tunable band-pass filter.

### Claim 4 (depends on 1)

The LiDAR system of claim 1, wherein the light filter is arranged between the lens and the detector.

### Claim 5 (depends on 1)

The LiDAR system of claim 1, wherein the lens is arranged between the light filter and the detector.

### Claim 6 (depends on 1)

The LiDAR system of claim 1, wherein the lens comprises a lens array.

### Claim 7

A method of operating a light detection and ranging (LiDAR) system, the method comprising:
setting a wavelength of light to be emitted;
applying a light emission starting signal to a light emitter so that the light emitter emits the light of the set wavelength;
adjusting a light transmission central wavelength of a light filter to the set wavelength;
in a vertical scan, detecting whether a current scanning angle of the emitted light with respect to a horizontal axis of the light emitter is within a preset range;
based on the current scanning angle being detected to be within the preset range, maintaining a present scanning state of the light emitter; and
based on the current scanning angle being detected to be outside the preset range, resetting, to a new wavelength, the wavelength of the light to be emitted.

### Claim 8 (depends on 7)

The method of claim 7, wherein the light emitter comprises light sources having different phases.

### Claim 9 (depends on 7)

The method of claim 7, wherein the light filter comprises a tunable band-pass filter.

### Claim 10 (depends on 7)

The method of claim 7, wherein the light emitter emits the light in a horizontal direction until the current scanning angle is detected to be outside the preset range.