LiDAR Laser Emission Control for Near-Field Eye Safety
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Solution Overview
Problem
LiDAR systems pose a risk of eye damage due to high-energy laser emissions that expand and converge differently in near and far fields, causing safety issues and affecting detection accuracy.
Innovation Solution
A method and device for controlling laser emission by emitting a secondary emergent laser at a first time to assess the near field, adjusting a primary emergent laser based on the detection echo, ensuring human eye safety and maintaining detection capability by varying power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If high energy is used for transmitted signal to ensure sufficient detection distance, then detection range is improved, but human eye safety in near field deteriorates
Solution Approach 1:
The transmitted signal energy is segmented into multiple levels: a first energy level for far field detection and a second energy level (lower than first) for near field detection. The system switches between these energy levels based on detected object distance, using high energy only when no objects are present in the near field zone.
Solution Approach 2:
The system performs preliminary detection in the near field region before transmitting high energy signals. By first checking if any objects (especially pedestrians) are present in the near field zone, the system can prevent high energy transmission that would endanger human eyes, thus taking preliminary protective action.
2Object-affected harmful factors
If transmitted signal energy is reduced to ensure human eye safety, then human eye safety is improved, but detection range and accuracy deteriorate
Solution Approach 1:
The transmitted signal energy is made dynamic rather than static. The system continuously monitors the near field region and adjusts the transmitted energy level in real-time based on object detection results, switching between high and low energy modes to optimize both safety and detection performance.
Solution Approach 2:
The system changes the energy parameter of the transmitted signal based on detection conditions. When objects are detected in the near field, the energy parameter is reduced to a safe level; when no objects are present, the energy parameter is increased to maximize detection range, thus dynamically adjusting parameters to resolve the contradiction.
3Measurement precision
If high energy transmitted signal is used, then detection accuracy is improved, but near field detection safety deteriorates
Solution Approach 1:
The detection space is segmented into near field region and far field region. Different energy levels are applied to different regions: low energy for near field (safety-critical zone) and high energy for far field (accuracy-critical zone), resolving the contradiction by spatial segmentation of energy application.
Solution Approach 2:
The system uses feedback from near field detection results to control transmitted signal energy. Detection results from the near field region feed back to the control unit, which then adjusts the energy level of subsequent transmissions, creating a closed-loop safety mechanism that maintains both accuracy and safety.
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
Ensures human eye safety in the near field while maintaining LiDAR detection accuracy and range by adjusting primary laser power based on secondary laser echoes, reducing energy exposure and minimizing detection blind zones.
Implementation Method 1
The LiDAR is a radar system that emits a laser beam to detect characteristics such as a position, a speed, or the like of a target
Implementation Method 2
A working principle of the LiDAR is to transmit a transmitted signal toward the target, and then compare a received echo signal reflected from the target with the transmitted signal
Data Source
AI summary
A method, a device, and an apparatus for controlling laser emission are provided. A secondary emergent laser is emitted at a first time of a detection period. A primary emergent laser emitted at a second time of the detection period is adjusted according to a first detection echo corresponding to the secondary emergent laser.