Laser Radar Homogenizing Unit for Fast Gating Ranging
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Solution Overview
Problem
Conventional laser radar systems employing the gating ranging method are slow and inefficient due to the need for multiple detections at different time points, resulting in a high false detection rate and long detection times.
Innovation Solution
A laser radar system comprising a light source, scanning unit, receiving lens, homogenizing unit, and processing unit, where the homogenizing unit uniformly distributes the echo light signal across photosensitive cells with gating circuits, allowing for fast gating ranging and reduced false detection rates by controlling the gating of photosensitive cells during specific time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional gating ranging method is used to detect targets at different distances separately at different time points, then the false detection rate is reduced, but the detection time is extended and detection efficiency is lowered
Solution Approach 1:
The light detection unit is divided into multiple photosensitive cells, each capable of independent gating control. This segmentation allows parallel detection of different time windows, enabling simultaneous measurement of multiple distance ranges in a single laser pulse emission, thus reducing total detection time while maintaining the ability to filter false detections through selective gating
Solution Approach 2:
The patent implements periodic gating control where each photosensitive cell is activated in specific time periods corresponding to different distance ranges. By coordinating the periodic activation of multiple photosensitive cells, the system performs comprehensive ranging detection across all distance ranges simultaneously, avoiding the need for sequential detection while maintaining reliable false detection rejection
2Measurement precision
If multiple separate detections are performed at different time points, then accurate ranging is achieved, but the system complexity and detection process become more complicated
Solution Approach 1:
Multiple photosensitive cells are merged into a single light detection unit with unified control. Each cell maintains independent gating capability but they operate simultaneously under coordinated control from the processing unit. This merging approach consolidates what would be separate detection systems into one integrated unit, reducing operational complexity while preserving ranging accuracy through simultaneous multi-window detection
3Device complexity
If a single photosensitive cell is used for detection, then the system structure is simple, but the detection efficiency and flexibility are reduced
Solution Approach 1:
The system employs dynamic gating control where each photosensitive cell can be independently activated or deactivated based on the detection requirements. The processing unit dynamically assigns gating windows to different photosensitive cells based on the target distance range, enabling flexible adaptation to different detection scenarios while maintaining a relatively simple physical structure
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 achieves fast and efficient ranging with reduced false detection rates by uniformly distributing the echo light signal and controlling the gating of photosensitive cells, enabling flexible operation and improved detection efficiency.
Implementation Method 1
the plurality of photosensitive cells are used to convert the received echo light signal into an echo electrical signal
Data Source
AI summary
A laser includes a light source, a scanning unit, a receiving lens, a homogenizing unit, a light detection unit, and a processing unit. The light source is configured to output a laser beam. The scanning unit is configured to guide the laser beam to a specified region. The receiving lens is configured to converge an echo light signal formed through reflection of the laser beam. The homogenizing unit is configured to uniformly emit the converged echo light signal onto a photosensitive pixel of the light detection unit, which includes a plurality of photosensitive cells. The plurality of photosensitive cells are used to convert the received echo light signal into an echo electrical signal and are controlled by a plurality of gating circuits. The processing unit is configured to analyze an echo electrical signal output by the plurality of photosensitive cells in a gating period.