Yarn Quality Detection Using Combined Reflection And Transmission Sensing
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Solution Overview
Problem
Existing optical sensor devices for detecting defects in elongate textile bodies face challenges in accurately distinguishing between different defects due to the dependence of reflected light on both yarn thickness and contamination, leading to unreliable measurements.
Innovation Solution
An optical sensor device with a support body and measurement chamber that utilizes both transmission and reflection sensors, where the transmission light source and reflection light source are positioned to illuminate the same spot on the textile body, and frame elements with controlled reflectance are used to minimize interference from peripheral areas, allowing for improved measurement reliability by combining reflection and transmission data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only reflection sensor is used to detect defects, then device complexity is reduced, but measurement precision deteriorates because reflected light depends on both yarn thickness and contamination
Solution Approach 1:
The patent combines reflection sensor and transmission sensor into a single integrated device. The reflection sensor detects light reflected from the yarn surface while the transmission sensor detects light transmitted through the yarn. By merging these two sensing mechanisms, the device achieves accurate defect detection that is independent of yarn thickness variations, resolving the contradiction between device complexity and measurement precision.
2Reliability
If transmission sensor is used alone, then measurement reliability improves for thickness detection, but ability to detect surface contaminants deteriorates
Solution Approach 1:
The integrated sensor device performs multiple functions simultaneously: the transmission sensor reliably detects yarn thickness variations while the reflection sensor detects surface contaminants and defects. This multi-functional approach resolves the contradiction by making the device adaptable to both thickness measurement and contamination detection without compromising either capability.
3Illumination intensity
If frame elements with high reflectance are used, then illumination intensity is improved, but interference from peripheral areas increases
Solution Approach 1:
The frame elements are designed with specific optical properties to provide localized illumination while minimizing peripheral interference. The frame elements surrounding the measurement window provide structured illumination that enhances the intensity of light reaching the measurement area, while their geometric configuration and optical properties ensure that reflected light from peripheral areas does not interfere with the measurement, thus resolving the contradiction between illumination intensity and peripheral interference.
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
The solution enables accurate detection of defects in elongate textile bodies by reducing interference from thickness variations and improving the signal-to-noise ratio, thereby enhancing measurement reliability and accuracy.
Implementation Method 1
An optical transmission sensor comprising a transmission light source arranged to send light through the measurement chamber and a transmission light detector arranged to receive light from the transmission light source after traversing the measurement chamber and the window
Implementation Method 2
An optical reflection sensor comprising a reflection light source arranged to send light into the measurement chamber and a reflection light detector arranged to receive light from the reflection light source after being reflected in the measurement chamber
Data Source
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Figure 3
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AI summary
An optical sensor device for detecting defects in an elongate textile body. The optical sensor comprising a measurement chamber (10) for the elongate textile body, a support body (14) having opposing first and second sides (24a, 24c) as well as peripheral sides extending transversally to said first and second sides (24a, 24c), at least a first light source, and at least a first and a second light detector. The first light source and the second light detector are both arranged on a first side (24a) of said measurement chamber (10). The first light detector is arranged on a second side (24c) of said measurement chamber (10). Said second side (24c) of said measurement chamber (10) is opposite to said first side (24a) of said measurement chamber (10).