Objective Sensor Dirt Detection via Multi-Point Wave Intensity
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Solution Overview
Problem
Existing objective sensors face challenges in accurately determining dirt on protective members, leading to potential degradation in sensing performance due to erroneous dirt detection based on single threshold conditions for transmission and reception time and intensity.
Innovation Solution
The objective sensor transmits waves in multiple directions, measuring transmission and reception time and intensity at various points, extracts dirt candidate points with shorter times and higher intensities, and confirms these points over a second threshold time to determine dirt distribution, providing a more precise assessment of dirt presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single threshold conditions are used for transmission and reception time and intensity, then the determination process is simple, but false positives occur leading to erroneous dirt detection
Solution Approach 1:
The patent segments the dirt detection process into multiple independent evaluation dimensions: transmission and reception time measurement, intensity measurement, and continuous presence verification. Each dimension is measured and evaluated separately, then integrated to form a comprehensive dirt determination. This segmentation allows the system to maintain simple individual measurements while achieving high overall detection accuracy through multi-criteria evaluation.
Solution Approach 2:
The patent implements preliminary action by continuously monitoring and storing transmission and reception time data before making a final dirt determination. The system pre-identifies candidate points that meet the time threshold criteria, then verifies their continuous presence over a second threshold period. This preliminary identification and verification process prevents false positives by ensuring that detected dirt candidates persist over time rather than being transient artifacts.
2Measurement precision
If multiple measurement points and continuous verification are used, then dirt detection accuracy is improved, but the determination process becomes more complex
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors dirt candidate points and verifies their persistence over time. The determination unit receives ongoing feedback from multiple measurement points and adjusts its assessment based on whether candidates maintain their characteristics throughout the second threshold period. This feedback loop enables accurate dirt detection while managing complexity through systematic verification rather than arbitrary complex processing.
3Loss of time
If simple threshold-based determination is used, then the response time is fast, but false positives occur reducing reliability
Solution Approach 1:
The patent implements preliminary action by continuously monitoring and storing transmission and reception time data before making a final dirt determination. The system pre-identifies candidate points that meet the time threshold criteria, then verifies their continuous presence over a second threshold period. This preliminary identification and verification process prevents false positives by ensuring that detected dirt candidates persist over time rather than being transient artifacts.
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 method enhances the accuracy of dirt detection, reducing false positives and improving the reliability of sensing performance by considering multiple measurement points and continuous dirt presence, allowing for precise dirt volume quantification and differentiation between local and discrete dirt.
Implementation Method 1
receives a reflected wave including the transmission wave reflected on the object
Data Source
AI summary
An objective sensor, a dirt determination method thereof, and an object detection device according to the present invention, individually transmit transmission waves in a plurality of mutually different directions and receive the respective reflected wave thereof, through a protective member, so as to measure, with the plurality of directions as a plurality of measurement points, a transmission and reception time and the intensity of the reflected wave for each of the plurality of measurement points. Then, the objective sensor, the dirt determination method thereof, and the object detection device extract, as dirt candidate points, the measurement points each having the transmission and reception time shorter than a first threshold time and the intensity equivalent to or more than threshold intensity, regard the dirt candidate points that have been extracted, as the dirt points in a case where the dirt candidate points continue for a second threshold time or more, and acquire the dirt point distributions on the basis of the dirt points. Then, the presence or absence of dirt on the protective member is determined, on the basis of the dirt point distributions that have been acquired.