Lidar Contamination Detection Using Light Reception Intensity Feedback
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Solution Overview
Problem
Existing contamination detection systems for laser radar apparatuses often inaccurately determine contamination due to reflections from highly reflective objects or background light, leading to erroneous results.
Innovation Solution
A contamination detection apparatus that acquires distance-measurement point information and scattered light intensity, and prohibits detection when light reception intensity exceeds a threshold or background light conditions are met, to improve determination accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contamination detection is performed based on scattered light intensity, then contamination detection capability is improved, but false detection increases due to reflections from highly reflective objects
Solution Approach 1:
The system uses light reception intensity from the laser radar as feedback to dynamically adjust whether contamination detection should be executed. When the light reception intensity exceeds a predetermined threshold, the system determines that a highly reflective object is present and prohibits contamination detection, thereby preventing false positives while maintaining the ability to detect actual contamination when conditions are appropriate
Solution Approach 2:
The system changes the operational state of the contamination detection function based on the light reception intensity parameter. By monitoring this parameter and comparing it against a threshold, the system dynamically enables or disables the contamination detection feature, adapting to environmental conditions to maintain accuracy
2Productivity
If contamination detection is performed continuously, then detection coverage is improved, but detection errors increase due to background light interference
Solution Approach 1:
The system continuously monitors light reception intensity as feedback to determine appropriate detection windows. By using this feedback mechanism, the system can identify periods when background light levels are acceptable and perform contamination detection only during those periods, maintaining continuous monitoring capability while avoiding detection during high-interference conditions
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 erroneous contamination determinations caused by reflections from highly reflective objects and background light, enhancing the accuracy of contamination detection in laser radar systems.
Implementation Method 1
a laser radar apparatus that: emits laser light toward outside by transmitting the laser light through an optical window
Implementation Method 2
scattered light that is generated by the laser light scattering inside the casing
Data Source
AI summary
A contamination detection apparatus acquires distance-measurement point information from a laser radar apparatus that generates the distance-measurement point information that indicates a distance-measurement point distance to a distance measurement point and light reception intensity of detected laser light. The contamination detection apparatus acquires scattered light information that indicates scattered light intensity of scattered light from a scattered light sensor that detects scattered light generated by the laser light scattering inside the casing as a result of emission of the laser light by the laser radar apparatus. The contamination detection apparatus executes contamination detection that detects contamination of the optical window based on the scattered light intensity indicated by the scattered light information. The contamination detection apparatus prohibits execution of the contamination detection when the light reception intensity is equal to or greater than an intensity threshold set based on the distance-measurement point distance corresponding to the light reception intensity.