Laser Scanner Rotation Speed Control for Detection Accuracy
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Solution Overview
Problem
Conventional laser scanning systems require increased size and cost to achieve higher radiant density of laser pulses per unit area for accurate obstacle detection, leading to a need for more laser scanners.
Innovation Solution
A laser scanning system that adjusts the rotation speed and radiation direction of a single laser scanner using a digital mirror device and multiple rotation axes to concentrate radiant density in detection areas, reducing the need for multiple scanners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of laser scanners is increased to achieve higher radiant density of laser pulses per unit area, then the detection accuracy of obstacles is improved, but the system size and cost increase
Solution Approach 1:
The patent applies local quality by making the laser radiation density non-uniform across the scanning field. The control unit increases the radiation density specifically in regions where detection targets are present or predicted to be present, while maintaining lower density in other regions. This allows high detection accuracy in critical areas without requiring multiple laser scanners across the entire system.
Solution Approach 2:
The patent implements dynamics by making the laser radiation density adjustable and time-varying. The control unit dynamically modifies the radiation density based on the presence, position, and movement of detection targets. This dynamic adjustment allows the single laser scanner to concentrate its capability where needed, resolving the contradiction between detection accuracy and system size.
2Measurement precision
If the number of laser scanners is increased to achieve higher radiant density of laser pulses per unit area, then the detection accuracy of obstacles is improved, but the system cost increases
Solution Approach 1:
The patent applies local quality by making the laser radiation density non-uniform across the scanning field. The control unit increases the radiation density specifically in regions where detection targets are present or predicted to be present, while maintaining lower density in other regions. This allows high detection accuracy in critical areas without requiring multiple laser scanners across the entire system.
Solution Approach 2:
The patent implements parameter changes by modifying the radiation density parameter of the laser scanner based on detection target information. The control unit adjusts the radiation density in real-time, concentrating laser pulses in areas with detection targets. This parameter adjustment allows a single scanner to achieve the effective density of multiple scanners, reducing system cost.
3Measurement precision
If the radiation density of laser pulses is increased uniformly across the entire scanning range, then the detection accuracy is improved, but the number of laser pulses required increases
Solution Approach 1:
The patent applies local quality by making the laser radiation density non-uniform across the scanning field. The control unit increases the radiation density specifically in regions where detection targets are present or predicted to be present, while maintaining lower density in other regions. This allows high detection accuracy in critical areas without requiring multiple laser scanners across the entire system.
Solution Approach 2:
The patent implements partial action by applying high radiation density only to the portion of the scanning field where detection targets are present or predicted to be present, rather than uniformly across the entire field. This partial concentration of laser pulses achieves the necessary detection accuracy while significantly reducing the total number of pulses required compared to uniform high-density scanning.
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 approach enhances detection accuracy without increasing system size or complexity, maintaining a low cost by focusing radiant density where needed.
Implementation Method 1
the laser scanner includes a digital mirror device configured to scan the laser in the radiation direction
Implementation Method 2
a laser distance measuring unit configured to emit a laser pulse toward a predetermined radiation direction and to acquire a reflected light from the emitted laser pulse which is reflected by a detection target
Data Source
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AI summary
A laser scanning system of the present invention includes a first rotation mechanism configured to perform a rotation in a predetermined first rotation axis and at a rotation speed around the first rotation axis as a rotation center; a first rotation speed control unit configured to control the rotation speed of the rotation in the first rotation axis by the first rotation mechanism, and a laser scanner device disposed on the first rotation mechanism, to be rotated together with and by the first rotation mechanism, and the laser scanner device including a laser distance measuring unit configured to emit a leaser and to measure a distance to a detection target, wherein the first rotation speed control unit is configured to make a control to the rotation speed of the rotation in the first rotation axis in a detection rotation angle range corresponding to an area in which the detection target is present and another control to the rotation speed of the rotation in the first rotation axis in a non-detection rotation angle range corresponding to another area in which the detection target is not present.