Light detection and ranging systems
A light detection and ranging system is provided. The light detection and ranging system includes a LIDAR scanning mirror; a processor configured to control the LIDAR scanning mirror; a first position sensor configured to determine a first position and a second position sensor configured to detect a second position of the LIDAR scanning mirror. The processor is configured to determine whether an eye-safety criterion is met based on the first position and the second position, and control light output of the LIDAR system based on whether the eye-safety criterion is met.
1 . A light detection and ranging (LIDAR) system, comprising:
a LIDAR scanning mirror;
a processor configured to control the LIDAR scanning mirror;
a first position sensor configured to determine a first position of the LIDAR scanning mirror and a second position sensor configured to detect a second position of the LIDAR scanning mirror;
the processor configured to
determine whether an eye-safety criterion is met based on the first position and the second position, and
control light output of the LIDAR system based on whether the eye-safety criterion is met.
2 . The LIDAR system of claim 1 ,
wherein the eye-safety criterion is a time period between a timing of the first position sensor detecting the LIDAR scanning mirror in the first position and a timing of the second position sensor detecting the LIDAR scanning mirror in the second position.
3 . The LIDAR system of claim 1 ,
wherein the processor is configured to control the light output of the LIDAR system by turning off a light source of the LIDAR system.
4 . The LIDAR system of claim 1 ,
wherein the processor is configured to control the light output of the LIDAR system by turning off an optical amplifier of the LIDAR system.
5 . The LIDAR system of claim 1 ,
further comprising a plurality of light sources, wherein the processor is further configured to determine a number of light sources of the plurality of light sources emitting light within a predefined time period.
6 . A light detection and ranging (LIDAR) system, comprising:
an optical amplifier to amplify light provided by a light source to generate output light of the LIDAR system having an output light power;
a processor configured to control the optical amplifier;
an electrical sensor configured to detect a current applied to the optical amplifier to control an amplification of the optical amplifier, wherein the detected current corresponds to the output light power; and
an optical sensor configured to detect light comprising at least one light from the light source and the generated output light;
the processor configured to control the output light power of the output light based on the detected current and the detected light whether an eye-safety criterion is met.
7 . The LIDAR system of claim 6 ,
wherein the processor is configured to control the light output of the LIDAR system by turning off the light source.
8 . The LIDAR system of claim 6 ,
wherein the processor is configured to control the light output of the LIDAR system by turning off the optical amplifier.
9 . The LIDAR system of claim 6 ,
wherein the processor is further configured to perform a test procedure, the test procedure comprising:
increase the amplification of the optical amplifier over a predefined threshold value corresponding to an eye-safety criterion,
trigger, within a predefined time period, the electrical sensor to detect a current and the optical sensor to detect a light, and
determine a time period between a detection time of one of the electrical sensor or the optical sensor, and a turning off time instant of the light source.
10 . The LIDAR system of claim 9 ,
wherein the processor is configured to perform the test procedure at a predetermined timing, wherein the predetermined timing is one of: before initial operation, after a predetermined time period of inactivity, during powering up of the LIDAR system, and after preset time periods.
11 . The LIDAR system of claim 6 ,
wherein the processor is further configured to perform a test procedure, the test procedure comprising:
trigger, within a predefined time period, the electrical sensor to detect a current and the optical sensor to detect a light,
continuously increase the amplification of the optical amplifier, and
determine the electrical current and the light when the electrical sensor detects an electrical current and the optical sensor detects the light over a predefined threshold value corresponding to an eye-safety criterion, and
determine a power difference based on a power corresponding to the detected electrical current and a power corresponding to the detected light.
12 . The LIDAR system of claim 11 ,
wherein the processor is configured to perform the test procedure at a predetermined timing, wherein the predetermined timing is one of: before initial operation, after a predetermined time period of inactivity, during powering up of the LIDAR system, and after preset time periods.
13 . The LIDAR system of claim 6 ,
wherein the processor is further configured to perform a test procedure, the test procedure comprising:
trigger, within a predefined time period, the electrical sensor to detect a current and the optical sensor to detect a light,
continuously decrease a predefined threshold value corresponding to an eye-safety criterion, and
determine the electrical current and the light when the electrical sensor detects an electrical current and the optical sensor detects the light over the predefined threshold value, and
determine a power difference based on a power corresponding to the detected electrical current and a power corresponding to the detected light, or
determine a time period between a detection time of one of the electrical sensor or the optical sensor, and a turning off time instant of the light source.
14 . The LIDAR system of claim 13 ,
wherein the processor is configured to perform the test procedure at a predetermined timing, wherein the predetermined timing is one of: before initial operation, after a predetermined time period of inactivity, during powering up of the LIDAR system, and after preset time periods.
15 . The LIDAR system of claim 6 ,
further comprising a plurality of light sources, wherein the processor is further configured to determine a number of light sources of the plurality of light sources emitting light within a predefined time period.
16 . A non-transitory computer readable medium having instructions stored therein that, when executed by one or more processors, cause the one or more processors to
determine sensor signals of:
at least a first position sensor detecting a first position of a LIDAR scanning component and a second position sensor detecting a second position of the LIDAR scanning component, and/or
an electrical sensor configured to detect an electrical current applied to an optical amplifier of a LIDAR system that controls the amplification of the optical amplifier and/or an optical sensor configured to detect light including at least one of the light from a light source of the LIDAR system or generated output light of the LIDAR system;
compare the determined signals of the first and second sensors, the electrical and/or the optical sensors with a predefined threshold value corresponding to an eye safety criterion; and
reduce a power of one or more components of the LIDAR system in case the determined signals exceed the predefined threshold value.
17 . The non-transitory computer readable medium of claim 16 ,
wherein the one or more components is an optical amplifier configured to amplify light provided by a light source and/or the LIDAR system.
18 . The non-transitory computer readable medium of claim 16 , further having instructions stored therein that, when executed by the one or more processors, cause the one or more processors to:
perform a test procedure independent from an operational state of the LIDAR system, wherein the test procedure comprises increasing of an input electrical current to the optical amplifier and/or increasing the input light to the optical sensor.
19 . The non-transitory computer readable medium of claim 16 ,
wherein reducing power of one or more components of the LIDAR system comprises a turning off of the one or more components.
20 . The non-transitory computer readable medium of claim 16 , further comprising instructions to perform a test procedure, the test procedure comprising:
increase the amplification of an optical amplifier over a predefined threshold value corresponding to an eye-safety criterion,
trigger, within a predefined time period, the electrical sensor to detect a current and the optical sensor to detect a light, and
determine a time period between a detection timing of one of the electrical sensor and the optical sensor, and a power reduction timing of the one or more components.