Yarn Defect Detection With Combined Transmission And Reflection 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 thickness and color variations due to the dependence of reflected light on both yarn thickness and contamination presence, leading to unreliable defect identification.
Innovation Solution
The optical sensor device employs a combination of transmission and reflection sensors with frame elements having controlled reflectance and inclined surfaces to minimize interference from peripheral reflections, allowing for simultaneous measurement of thickness and color variations by combining reflection and transmission data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reflected light measurement is used to detect defects, then foreign material can be detected, but thickness variations cannot be distinguished from color variations
Solution Approach 1:
The patent combines transmission light measurement and reflection light measurement into a single sensor device. The transmission sensor measures light transmitted through the yarn to detect thickness variations, while the reflection sensor measures light reflected from the yarn surface to detect foreign material. By merging these two measurement methods, the device can distinguish between thickness defects and foreign material defects that would be indistinguishable using reflection alone.
Solution Approach 2:
The sensor device is segmented into two independent measurement systems: a transmission light sensor with its own light source and detector, and a reflection light sensor with its own light source and detector. Each sensor targets specific defect types, allowing the system to separate and identify different defect categories accurately.
2Measurement precision
If frame elements are added to the sensor device, then peripheral reflection interference is reduced, but device complexity increases
Solution Approach 1:
The patent extracts and isolates the problematic peripheral reflections by introducing frame elements that create a defined measurement area. The frame elements separate the central measurement region from peripheral regions, preventing stray light from interfering with the measurement. This extraction of the measurement area from its problematic environment improves reliability without requiring complex signal processing.
3Adaptability or versatility
If multiple light sources and detectors are arranged around the textile body, then both transmission and reflection measurements can be performed, but the device becomes more complex
Solution Approach 1:
The sensor device is designed with multi-functionality, where the transmission sensor and reflection sensor work together to provide comprehensive defect detection. The device can adapt to detect different defect types (thickness variations, foreign material, color variations) using the appropriate sensor, making it a versatile quality control tool despite the increased component count.
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 reliability of defect detection by reducing the influence of peripheral reflections, enabling accurate measurement of both thickness and color variations in textile bodies, improving the overall measurement quality and reliability of defect identification.
Implementation Method 1
an optical transmission sensor comprising a transmission light source arranged to send light through the measurement chamber (10) and the window (80), 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 (10), and a reflection light detector arranged to receive light from the reflection light source after being reflected in the measurement chamber (10)
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).