Laser Radar Line Beam Intensity Control for Long-Range Detection
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Solution Overview
Problem
Laser radars face a reduction in frame rate for acquiring information due to increased resolution at measurement positions, and existing methods to enhance detection distance by increasing light intensity are inefficient and costly.
Innovation Solution
A laser radar system that projects a line beam with varying light intensity along its long side direction, using a configuration of laser diodes and optical components to adjust the beam's spread and intensity distribution, allowing for efficient detection at different distances while optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scanning is performed with an elongated line beam to maintain frame rate, then productivity is improved, but the energy density of the beam decreases as distance increases, worsening measurement precision
Solution Approach 1:
The patent applies local quality by creating non-uniform light intensity distribution along the line beam, with higher intensity concentrated in specific regions. This is achieved through optical elements that modulate the beam profile, allowing high energy density to be focused on distant targets while maintaining the elongated beam shape for high frame rate scanning. The beam intensity varies locally along its length, optimizing detection precision at different distances without sacrificing productivity.
2Measurement precision
If light intensity is increased to detect objects at longer distances, then measurement precision is improved, but use of energy increases, worsening efficiency
Solution Approach 1:
The patent implements local quality by concentrating high light intensity only in specific regions of the line beam where long-distance detection is required, rather than uniformly increasing intensity across the entire beam. This spatially selective intensity distribution allows the system to achieve extended detection distance in critical areas while maintaining lower power consumption in regions where high intensity is not needed, thus resolving the contradiction between measurement precision and energy efficiency.
Solution Approach 2:
The patent applies partial action by providing high light intensity only partially along the length of the line beam, specifically in regions where long-distance object detection is required. Rather than uniformly intensifying the entire beam, the system concentrates energy in selective zones, achieving sufficient detection precision at long distances while avoiding excessive energy consumption in areas where high intensity is unnecessary.
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 enables efficient object detection at longer distances with uniform intensity distribution, reducing power consumption and maintaining high detection accuracy across the measurement area.
Implementation Method 1
an optical system configured to shape the laser light into a line beam that is long in one direction, and project the line beam
Implementation Method 2
a scanner configured to perform scanning with the line beam in a short side direction of the line beam
Data Source
AI summary
The laser radar includes: a light source configured to emit laser light; an optical system configured to shape the laser light into a line beam that is long in one direction, and project the line beam; a scanner configured to perform scanning with the line beam in a short side direction of the line beam; and a configuration for causing light intensity of the line beam to be different in a long side direction of the line beam. The light intensity of the line beam is caused to be different, for example, by a controller controlling emission power of a plurality of light emitting portions disposed in the light source along a direction corresponding to the long side direction of the line beam.