Dynamic Laser Power Control for LiDAR Eye Safety
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Solution Overview
Problem
LiDAR systems face challenges in balancing high laser energy for improved detection range and signal-to-noise ratio while ensuring safety to prevent harm to human eyes, particularly in scenarios where objects are close, as traditional methods set energy limits based on worst-case assumptions that may not account for varying distances and object types.
Innovation Solution
A dynamic laser power control system that adjusts the laser emission scheme based on real-time distance measurements from objects, comparing the total power incident on an aperture with predetermined tolerance values to ensure safety limits are not exceeded, thereby reducing power when objects are close to prevent potential harm to human eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher energy laser light is used to improve detection range and signal-to-noise ratio, then detection performance is improved, but safety risk increases due to potential harm to human eyes
Solution Approach 1:
The patent implements dynamic laser power control that adjusts emission power in real-time based on detected object characteristics. The system transitions from static worst-case power limiting to dynamic power adjustment, where the laser power is modified based on object distance, reflectivity, and type, thereby improving detection performance while maintaining safety
Solution Approach 2:
The system employs feedback mechanisms by continuously monitoring detected objects and their characteristics (distance, reflectivity, type), then using this information to adjust laser power settings. This closed-loop control allows the system to optimize detection range and signal-to-noise ratio while ensuring safety constraints are met based on actual environmental conditions
2Object-affected harmful factors
If static worst-case power limits are applied to ensure safety, then safety is guaranteed, but detection performance deteriorates due to unnecessarily reduced power at safe distances
Solution Approach 1:
The patent applies different power levels to different spatial regions and object types. Instead of uniformly limiting power across all directions and scenarios, the system adjusts power locally based on object characteristics - using higher power when objects are distant or have high reflectivity, and lower power when objects are close or vulnerable, thereby optimizing detection performance while maintaining safety
Solution Approach 2:
The system dynamically changes laser emission parameters (power, pulse duration, repetition rate) based on detected object characteristics. By modifying these parameters in response to real-time measurements of object distance, reflectivity, and type, the system achieves both improved detection performance and maintained safety, avoiding the performance penalty of static worst-case limits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively balances detection performance with safety by dynamically adjusting laser power, ensuring that the total power incident on a human pupil does not exceed safety limits, thus preventing eye damage while maintaining high-resolution and long-range LiDAR capabilities.
Implementation Method 1
a typical LiDAR system measures the distance to a target by illuminating the target with pulsed laser light beams
Implementation Method 2
measuring the reflected pulses with a sensor such as a photodetector
Implementation Method 3
measuring the reflected pulses with a sensor such as a photodetector
Data Source
AI summary
Embodiments of the disclosure provide a system for controlling power of laser lights emitted by an optical sensing device. The system includes at least one storage device configured to store instructions and at least one processor communicatively coupled to the at least one storage device and configured to execute the instructions to perform operations. The operations include detecting an object within a field of view of the optical sensing device based on a reflected laser signal received by the optical sensing device, determining a distance of the object from the optical sensing device, determining a value indicating a total power of one or more laser beams to be incident on an aperture at the distance, and comparing the value with a predetermined tolerance value. The operations also includes adjusting a laser emission scheme to reduce the total power when the value is greater than the predetermined tolerance value.