Lidar Dynamic Range Expansion via Radiant Power Damping
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Solution Overview
Problem
Current LIDAR systems face challenges in distinguishing objects with low reflectivity at long distances and high reflectivity at short distances due to dynamic range limitations, leading to crosstalk effects and erroneous detections in 3D point clouds.
Innovation Solution
The LIDAR device incorporates active or passive damping of radiant power in the emitting or receiving units to expand its dynamic range, using pulsed beams and separate detectors to prevent crosstalk, with adaptive control units managing beam intensity to handle varying reflectivity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detector is designed to detect low reflectivity objects at long distances, then detection sensitivity for dark objects is improved, but highly reflective objects cause detector saturation and crosstalk effects
Solution Approach 1:
The patent implements dynamic adjustment of the detector's sensitivity or the beam's radiant power based on the detected reflectivity level. The system transitions from a static detector design to a dynamic one that adapts its parameters in real-time, switching between high sensitivity mode for dark objects and reduced sensitivity mode for highly reflective objects to prevent saturation and crosstalk
Solution Approach 2:
The patent changes the operational parameters of the detector or beam source depending on the object's reflectivity. This includes adjusting the beam's radiant power or the detector's gain/sensitivity parameters dynamically, allowing the system to optimize detection for both low and high reflectivity objects without suffering from saturation effects
2Measurement precision
If the beam radiant power is increased to improve detection of low reflectivity objects, then detection capability for dark objects is enhanced, but crosstalk effects and detector saturation occur with highly reflective objects
Solution Approach 1:
The system dynamically adjusts the beam's radiant power based on the object's reflectivity characteristics. For low reflectivity objects, the beam power is increased to ensure sufficient signal return, while for highly reflective objects, the power is reduced to prevent saturation and crosstalk effects in the detector
Solution Approach 2:
The system employs feedback mechanisms where the detected signal strength from previous measurements is used to adjust the beam radiant power for subsequent measurements. This feedback loop allows the system to automatically adapt to different object reflectivity levels, preventing crosstalk while maintaining detection capability
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
This solution enables reliable detection of both low and high reflectivity objects, minimizing crosstalk and improving detection accuracy, thereby enhancing the reliability of LIDAR systems in applications like automated driving by expanding the dynamic range and reducing erroneous detections.
Implementation Method 1
an emitting unit that includes at least one beam source for generating and for emitting beams into the scanning area
Implementation Method 2
at least one detector for receiving beams backscattered and/or reflected from the scanning area
Implementation Method 3
a receiving unit that includes at least one detector for receiving beams
Implementation Method 4
a radiant power of the beam backscattered and/or reflected from the scanning area directed at the at least one detector is actively and/or passively dampable
Data Source
AI summary
A LIDAR device for scanning scanning areas. The LIDAR device includes an emitting unit that includes at least one beam source for generating and for emitting beams into the scanning area, and includes a receiving unit that includes at least one detector for receiving beams backscattered and/or reflected from the scanning area, a radiant power of the beams backscattered and/or reflected from the scanning area directed at the at least one detector in the area of the emitting unit and/or in the area of the receiving unit being actively and/or passively dampable for expanding the dynamic range.