2D Light Emitter Array for Laser Radar Distance and Resolution
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Solution Overview
Problem
Existing laser sensors face challenges in increasing detection distance, expanding the detection region in the up and down direction, and improving detection resolution performance in these directions.
Innovation Solution
A laser radar system with a two-dimensionally arranged plurality of light emitter groups, a light receiver, and a light source driver, where the light emitter groups are controlled to emit and receive light to determine object existence, distance, and position, eliminating the need for a scanning mechanism like a polygon mirror.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rotating polygon mirror and pulse light incident unit are used, then the device can detect objects, but the detection distance and detection region in up and down direction are limited
Solution Approach 1:
The light source is divided into multiple light emitter groups arranged in a two-dimensional matrix pattern. Each light emitter group can be independently controlled to emit light in specific directions, eliminating the need for a rotating polygon mirror scanning mechanism. This segmentation allows simultaneous multi-directional illumination, expanding the detection region in up and down directions while increasing detection distance through coordinated emission from multiple groups.
Solution Approach 2:
The patent transitions from a one-dimensional scanning approach (rotating polygon mirror) to a two-dimensional light emitter group arrangement. The light emitter groups are positioned in a matrix configuration with different spatial coordinates, enabling light emission in multiple directions simultaneously. This dimensional change expands the detection region vertically (up and down directions) without requiring mechanical scanning, thereby resolving the contradiction between detection capability and device complexity.
2Measurement precision
If a rotating polygon mirror is used to scan the measurement area, then the detection region can be covered, but the detection resolution performance in up and down direction is insufficient
Solution Approach 1:
The light source is segmented into multiple light emitter groups arranged in a two-dimensional matrix, where each group contains multiple light emitters positioned at different locations. This segmentation enables independent control of light emission in different directions, allowing high-resolution detection in up and down directions without relying on the limited angular resolution of a rotating polygon mirror.
Solution Approach 2:
The patent replaces the mechanical rotating polygon mirror scanning system with a electronically controlled array of light emitter groups. Instead of mechanically scanning a single light beam through rotation, the system uses electronic control to activate specific light emitter groups in the two-dimensional array, achieving high-resolution spatial detection without mechanical moving parts. This substitution eliminates the resolution limitations inherent in mechanical scanning while maintaining system simplicity.
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 allows for increased detection distance, expanded detection region in the up and down direction, and improved detection resolution performance without the limitations of traditional systems, providing accurate positional and size information of objects.
Implementation Method 1
a light receiver which receives light emitted from the projector, and reflected by an object
Data Source
AI summary
An object detector includes a projector including a light source having a two-dimensionally arranged plurality of light emitter groups, each of the light emitter groups having a plurality of light emitters, a light receiver which receives light emitted from the projector, and reflected by an object, and a light source driver which lights on and lights off each of the light emitter groups of the light source.