LiDAR Intensity Control for Distance-Based Luminance Stabilization
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Solution Overview
Problem
Existing optical sensing systems using LiDAR scanners face challenges in accurately detecting defects due to luminance variations caused by the distance of the measurement target from the scanner, leading to potential erroneous detection of recesses and other features.
Innovation Solution
An optical sensing system that includes a three-dimensional scanner and an intensity determination unit, which dynamically adjusts the intensity of the laser light based on distance data to suppress luminance changes caused by the length of the measurement target, using methods such as squaring the distance or referencing an intensity determination table to maintain consistent luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the measurement target is located at a greater distance from the LiDAR scanner, then the scanning coverage area is improved, but the luminance of reflected light decreases leading to erroneous defect detection
Solution Approach 1:
The patent dynamically changes the intensity parameter of the laser light based on the distance to the measurement target. The intensity determination unit adjusts the laser intensity in real-time according to distance data, ensuring that the luminance of reflected light remains within a predetermined range regardless of the target's distance, thereby maintaining defect detection accuracy across the entire scanning coverage area
Solution Approach 2:
The system implements a feedback mechanism where the intensity determination unit receives distance data from the three-dimensional scanner and uses this information to dynamically adjust the laser light intensity. This closed-loop control ensures that luminance variations due to distance changes are compensated, preventing erroneous defect detection while maintaining consistent measurement quality across varying distances
2Illumination intensity
If the laser light intensity is increased to compensate for distance, then the luminance of reflected light is improved, but the risk of saturation and loss of defect detection accuracy increases
Solution Approach 1:
The patent employs dynamic adjustment of laser light intensity rather than using a fixed high intensity. The intensity determination unit continuously adapts the laser intensity based on real-time distance measurements, increasing intensity only when necessary for distant targets and maintaining lower intensity for closer targets, thus preventing saturation while ensuring sufficient luminance for accurate defect detection
Solution Approach 2:
The system dynamically changes the intensity parameter of the laser light based on the distance to the measurement target. By adjusting the intensity parameter in real-time according to distance data, the system ensures that the luminance of reflected light remains within an optimal range that prevents both underexposure and saturation, maintaining defect detection reliability across all distances
3Device complexity
If a fixed laser light intensity is used during scanning, then the device complexity is reduced, but the luminance variation due to distance changes causes erroneous defect detection
Solution Approach 1:
The intensity determination unit serves multiple functions: it receives distance data from the three-dimensional scanner, processes this information to determine appropriate laser intensity levels, and outputs control signals to the laser light source. This multi-functional component adds minimal complexity while effectively preventing luminance variations that would otherwise cause erroneous defect detection
Solution Approach 2:
The system implements a feedback mechanism where the intensity determination unit receives distance data from the three-dimensional scanner and uses this information to dynamically adjust the laser light intensity. This closed-loop control ensures that luminance variations due to distance changes are compensated, preventing erroneous defect detection while maintaining consistent measurement quality across varying distances
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 effectively suppresses luminance changes due to distance variations, enhancing the accuracy of defect detection by maintaining consistent luminance levels and improving the reliability of point cloud data generation.
Implementation Method 1
a three-dimensional scanner configured to scan a measurement target with a laser light and receive reflected light of the laser light to generate distance data indicating a distance to the measurement target and luminance data indicating luminance of the reflected light
Implementation Method 2
receive reflected light of the laser light
Implementation Method 3
an intensity determination unit for dynamically determining intensity of the laser light based on the distance data so as to suppress a change in luminance of the reflected light caused by a length of the distance during the scanning
Data Source
AI summary
The optical sensing system includes a three-dimensional scanner and an intensity determination means. The three-dimensional scanner scans a measurement target with a laser light and receives reflected light of the laser light to generate distance data indicating a distance to the measurement target and luminance data indicating luminance of the reflected light. The intensity determination means dynamically determines intensity of the laser light based on the distance data so as to suppress a change in luminance of the reflected light caused by a length of the distance during the scanning of the three-dimensional scanner.