Virtual windows for LIDAR safety systems and methods
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.
1. A system for use in a vehicle, comprising:
a light detection and ranging (LiDAR) system operative to direct light pulses originating from a light source to one or more locations within a field of view;
a proximity detection system operative to detect presence of an object within a fixed distance of the LiDAR system; and
a control system operative to instruct the LiDAR system to:
determine whether an object is detected within the fixed distance and whether an energy density of the light pulses is greater than a safety level;
deactivate the light source in response to a detection that an object is within the fixed distance and that the energy density of the light pulses is greater than the safety level; and
continue to direct light pulses to the field of view in response to:
a detection that the object is located greater than the fixed distance and the energy density of the light pulses is greater than the safety level, or
a detection that the object is located within the fixed distance and the energy density of the light pulses is less than the safety level.
2. The system of claim 1 , wherein the energy density of the light pulses within the field of view exceeds 10 milliWatts within a 3.5 mm aperture at a distance of 100 mm external to the LiDAR system.
3. The system of claim 1 , wherein the fixed distance is proportional to the energy density of the light pulses within the field of view.
4. The system of claim 1 , wherein the fixed distance ranges between 0.1 meters and 1 meter.
5. The system of claim 1 , wherein the object is a human being.
6. The system of claim 1 , wherein the proximity detection system comprises an infrared sensor.
7. 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 LiDAR, or any combination thereof.
8. A method for selectively disabling a light detection and ranging (LiDAR) system, comprising:
monitoring a virtual window with a proximity detection system, wherein the virtual window extends a fixed distance beyond a periphery of the LiDAR system;
detecting, via the proximity detection system, presence of an object within the virtual window;
determining whether an object is detected within the virtual window and whether an energy density of light pulses is greater than a safety level;
deactivating a portion of the LiDAR system in response to a detection that an object is within the virtual window and that the energy density of the light pulses is greater than the safety level, wherein the portion prevents emission of the light pulses from the LiDAR system; and
continuing to direct light pulses to the virtual window in response to:
a detection that the object is not within the virtual window 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 and the energy density of the light pulses is less than the safety level.
9. The method of claim 8 , further comprising:
projecting the light pulses from a light source to one or more locations within a field of view.
10. The method of claim 9 , wherein the energy density of the light pulses within the field of view exceeds 10 milliWatts within 3.5 mm aperture at a distance of 100 mm external to the LiDAR system.
11. The method of claim 9 , wherein the fixed distance is proportional to the energy density of the light pulses within the field of view.
12. The method of claim 8 , wherein the portion of the LiDAR system comprises a light source.
13. The method of claim 8 , wherein the fixed distance ranges between 0.1 meters and 1 meter.
14. The method of claim 8 , further comprising:
discriminating whether the object is a human being; and
rejecting objects determined not to be a human being.
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;
determining whether an energy density of light pulses is greater than a safety level;
deactivating the LiDAR system when the person is detected to be within the virtual window zone and that the energy density of the light pulses is greater than the safety level; and
continuing to transmit light pulses to the virtual window zone 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.
16. The method of claim 15 , wherein the virtual window zone extends beyond a periphery of the LiDAR system.
17. The method of claim 16 , wherein the virtual window zone extends beyond the periphery of the LiDAR system by a fixed distance.
18. The method of claim 17 , wherein the fixed distance is less than 1 meter.
19. The method of claim 15 , wherein the transmitted light pulses are emitted at a power level that exceeds a laser safety standard.
20. The method of claim 15 , wherein the transmitted light pulses are emitted such that an energy density exceeds a laser safety standard.