Dual-Wavelength Yarn Detection Using Complementary Light
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Solution Overview
Problem
Conventional textile material measuring devices have limitations in detecting foreign particles of certain colors due to sensitivity issues, particularly struggling with yellow and blue foreign particles, as they rely on single-color light sources which reduce detection accuracy.
Innovation Solution
The device employs a dual-light source system with complementary colors, such as yellow and blue LEDs, to irradiate and detect reflected and transmitted light, allowing for the detection of foreign particles of all colors by compensating for sensitivity weaknesses and using ultraviolet light for polypropylene detection, along with a distinguishing section to differentiate between trash and foreign particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-color light source (e.g., green LED) is used for detecting foreign particles, then the device complexity is reduced and ease of manufacture is improved, but the measurement precision and reliability for detecting foreign particles of certain colors (e.g., yellow or blue) deteriorate
Solution Approach 1:
The detection system is segmented into multiple independent detection channels, each using a different wavelength light source (e.g., green LED for red foreign particles, yellow LED for blue foreign particles, blue LED for yellow foreign particles). This segmentation allows each channel to be optimized for specific color detection while maintaining overall system simplicity
Solution Approach 2:
The system changes the wavelength parameter of the light source to match the complementary color of the foreign particle being detected. By selecting appropriate wavelengths (green, yellow, blue LEDs), the system achieves high measurement precision for detecting foreign particles of different colors without significantly increasing manufacturing complexity
2Device complexity
If a single-color light source is used, then the device complexity is reduced, but the adaptability for detecting foreign particles of all colors deteriorates
Solution Approach 1:
The detection device achieves multi-functionality by incorporating multiple light sources with different wavelengths that can detect various colors of foreign particles. The system is designed to handle different detection scenarios (red, blue, yellow foreign particles) using a unified structural framework, making it adaptable to different detection needs while controlling overall complexity
Solution Approach 2:
The system dynamically selects which light source to use based on the detection requirements. The control unit can activate specific LEDs (green, yellow, or blue) depending on which foreign particle color needs to be detected, providing adaptability without requiring all components to be simultaneously active or complex
3Ease of operation
If conventional single-wavelength detection is used, then the ease of operation is improved, but the reliability for detecting complementary color foreign particles deteriorates
Solution Approach 1:
The control unit receives feedback from the detection unit and automatically determines which foreign particle color is present based on the detection results from multiple wavelengths. This feedback mechanism ensures reliable detection by selecting the appropriate wavelength combination, while the automated control maintains ease of operation without requiring manual wavelength selection
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 the sensitivity for detecting foreign particles of all colors, including yellow and blue, and improves the detection of yarn thickness, enabling the formation of high-quality packages with reduced foreign particles and thickness abnormalities.
Implementation Method 1
detect the foreign particle in accordance with reflected light from the light source section
Implementation Method 2
The amount of both the transmitted light and the reflected light is electrically converted by a light receiving element such as a photo diode
Data Source
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AI summary
A clearer (15) includes a first light source section (61), a second light source section (63), a first light receiving section (62), a second light receiving section (64), a first detecting section (55a), and a second detecting section (55b). The first light source section (61) irradiates yellow light to a spun yarn (20). The second light source section (63) irradiates blue light to the spun yarn (20), the blue light being complementary color of yellow. The first light receiving section (62) receives reflected light, the reflected light being the light from the first light source section (61) reflected by the spun yarn (20). The second light receiving section (64) receives reflected light and transmitted light, the reflected light being the light from the second light source section (63) reflected by the spun yarn (20), the transmitted light being the light from the second light source section (63) that has been transmitted through the spun yarn (20). The first detecting section (55a) detects a foreign particle in the spun yarn (20) in accordance with the reflected light received by the first light receiving section (62) and the second light receiving section (64). The second detecting section (55b) detects thickness of the spun yarn (20) in accordance with the transmitted light received by the second light receiving section (64).