LiDAR Detector Bias Voltage Segmentation for Dynamic Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LiDAR systems face limitations in detection range and reflectivity differentiation due to saturation issues in SiPMs, leading to blind regions in short-distance ranging and inability to distinguish reflectivities effectively.
Innovation Solution
The laser detector is designed with multiple optical detection units divided into blocks with different bias voltages, allowing for high and low photoelectric conversion efficiencies, enabling greater dynamic detection range and improved reflectivity differentiation by combining outputs from blocks with varying bias voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bias voltage is applied to optical detection units, then the device structure is simple, but the detection range is limited and cannot distinguish reflectivities at different distances
Solution Approach 1:
The optical detection units are divided into multiple blocks, where each block is assigned a different bias voltage. This segmentation allows each block to operate at different photoelectric conversion efficiencies, enabling the system to detect both weak and strong light signals simultaneously, thereby expanding the detection range and ability to distinguish reflectivities at different distances.
Solution Approach 2:
Different blocks of optical detection units are assigned different bias voltages according to their specific detection needs. Blocks detecting weak light signals receive higher bias voltages for enhanced sensitivity, while blocks detecting strong light signals receive lower bias voltages to avoid saturation. This local differentiation of operating conditions optimizes the overall detection performance.
2Measurement precision
If high bias voltage is applied to optical detection units, then photoelectric conversion efficiency is high, but saturation occurs leading to blind regions in short-distance ranging
Solution Approach 1:
The system dynamically assigns different bias voltages to different blocks of optical detection units based on the expected signal strength. By making the bias voltage configurable and block-specific, the system can adapt to different detection scenarios, using high bias voltages for weak signals and low bias voltages for strong signals, thus avoiding saturation while maintaining high conversion efficiency where needed.
3Measurement precision
If multiple blocks with different bias voltages are used, then detection range and reflectivity differentiation are improved, but device complexity increases
Solution Approach 1:
Multiple blocks with different bias voltages are merged into a single integrated detector structure. The output signals from all blocks are combined and processed together, allowing the system to achieve extended dynamic detection range and reflectivity differentiation capabilities while maintaining a unified device architecture rather than requiring separate detection systems.
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 configuration enhances detection range and reflectivity differentiation, reducing energy consumption and simplifying the design of the transceiving sequence, while maintaining high sensitivity and dynamic range, especially for weak and strong light conditions.
Implementation Method 1
A laser detector is a core device in the TOF solution, and determines detection efficiency, detection resolution and a dynamic detection range in a photoelectric conversion process
Data Source
AI summary
This application pertains to the field of laser detection, and specifically, relates to a laser detector, including multiple optical detection units and a received signal processing module, where the multiple optical detection units are divided into at least a first block and a second block, a first bias voltage is input into each optical detection unit in the first block, a second bias voltage is input into each optical detection unit in the second block, and the first bias voltage is different from the second bias voltage. The received signal processing module is configured to process a received incident optical signal detected by the first block and the second block and provide an output signal.