Virtual windows for LiDAR safety systems and methods

Patent metadata

Field	Value
Publication number	US-11940570-B2
Application number	US-202318101083-A
Country	US
Kind code	B2
Filing date	Jan 24, 2023
Priority date	Aug 24, 2018
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

Embodiments discussed herein refer to LiDAR systems and methods that use a virtual window to monitor for potentially unsafe operation of a laser. If an object is detected within the virtual window, the LiDAR system can be instructed to deactivate laser transmission.

First claim

What is claimed is:

1. A system, comprising:
a light detection and ranging (LiDAR) system configured to direct light pulses originating from a light source to one or more locations within a field of view;
a proximity detection system configured to project a virtual window zone to monitor presence of an object within the virtual window zone and determine whether the object is a human being, wherein a size of the virtual window zone is proportional to an energy density of the light pulses; and
a control system configured to instruct the LiDAR system to:
deactivate the light source to stop directing the light pulses to the field of view, in response to a determination that the object is a human being within the virtual window zone and that the energy density of the light pulses is greater than a safety level, and
continue to direct the light pulses to the field of view in response to a determination that the object is not a human being.

2. The system of claim 1 , wherein the control system is further configured to instruct the LiDAR system to continue to direct the light pulses to the field of view in response to:
a detection that the object is not within the virtual window zone and the energy density of the light pulses is greater than the safety level, or
a detection that the object is located within the virtual window zone and the energy density of the light pulses is less than the safety level.

3. The system of claim 1 , wherein the proximity detection system comprises at least one of an infrared sensor, an ultrasonic sensor, a camera, a proximity sensor, a facial recognition system, a thermal sensor, a radar, a second LiDAR system, or any combination thereof.

4. The system of claim 1 , wherein the energy density of the light pulses exceeds a laser safety standard.

5. The system of claim 1 , wherein the light pulses are emitted at a power level that exceeds a laser safety standard.

6. The system of claim 1 , further comprising a shutter configured to stop transmission of the light pulses in response to the detection of the object within the virtual window zone and a determination that the energy density of the light pulses is greater than the safety level.

7. A method for selectively disabling a light detection and ranging (LiDAR) system, comprising:
monitoring a virtual window zone with a proximity detection system;
detecting, via the proximity detection system, presence of an object within the virtual window zone;
determining whether the object is a human being;
deactivating a portion of the LiDAR system in response to a determination that the object is a human being within the virtual window zone and that an energy density of the light pulses is greater than a safety level, wherein the portion prevents emission of light pulses from the LiDAR system, and wherein a size of the virtual window zone is proportional to the energy density of the light pulses; and
continuing the emission of the light pulses in response to a determination that the object is not a human being.

8. The method of claim 7 , further comprising:
continuing the emission of the light pulses from the LiDAR system in response to:
a detection that the object is not within the virtual window zone and the energy density of the light pulses is greater than the safety level, or
a detection that the object is located within the virtual window zone and the energy density of the light pulses is less than the safety level.

9. The method of claim 7 , projecting the light pulses from a light source to one or more locations within a field of view.

10. The method of claim 7 , wherein the proximity detection system comprises at least one of an infrared sensor, an ultrasonic sensor, a camera, a proximity sensor, a facial recognition system, a thermal sensor, a radar, a second LiDAR system, or any combination thereof.

11. The method of claim 7 , wherein the portion of the LiDAR system comprises a light source.

12. The method of claim 7 , wherein the energy density of the light pulses exceeds a laser safety standard.

13. The method of claim 7 , wherein the light pulses are emitted at a power level that exceeds a laser safety standard.

14. The method of claim 7 , wherein the portion comprises a shutter configured to stop transmission of the light pulses in response to the detection of the object within the virtual window zone and a determination that the energy density of the light pulses is greater than the safety level.

15. A method for enforcing safe operation of a light detection and ranging (LiDAR) system, comprising:
transmitting light pulses from the LiDAR system;
detecting whether a person is located within a virtual window zone of the LiDAR system, wherein a size of the virtual window zone is proportional to an energy density of the light pulses;
deactivating the LiDAR system to stop directing the light pulses, in response to a detection that the person is within the virtual window zone and that the energy density of the light pulses is greater than a safety level; and
continuing to transmit light pulses in response to a determination that an object is not a human being.

16. The method of claim 15 , further comprising:
continuing to transmit light pulses from the LiDAR system in response to:
a detection that the person is not within the virtual window zone and the energy density of the light pulses is greater than the safety level, or
a detection that the person is located within the virtual window zone and the energy density of the light pulses is less than the safety level.

17. The method of claim 15 , further comprising:
projecting the light pulses from a light source to one or more locations within a field of view.

18. The method of claim 15 , wherein the energy density of the light pulses exceeds a laser safety standard.

19. The method of claim 15 , wherein the light pulses are emitted at a power level that exceeds a laser safety standard.

20. The method of claim 15 , wherein the LiDAR system comprises a shutter configured to stop transmission of the light pulses in response to the detection of the person within the virtual window zone and a determination that the energy density of the light pulses is greater than the safety level.

Assignees

• Innovusion Inc
• Seyond Inc

Inventors

• Li Yimin
• Zhang Rui
• Bao Junwei

Classifications

• G01S7/497 Primary

  Means for monitoring or calibrating · CPC title

• G01S7/484

  Transmitters · CPC title

• G01S17/10

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

• G01S17/931 Primary

  of land vehicles · CPC title

• G01S17/42

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