Terahertz Defect Detection in High-Speed Strand Products
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Solution Overview
Problem
Existing methods for detecting defects, such as extrusion residue, in thin strand-like products like microducts and medical tubes are inadequate, as they are complex, contact-based, and only allow offline detection, leading to waste and inaccurate localization.
Innovation Solution
Utilizing terahertz radiation to emit and receive signals from the strand-like product, analyzing changes in the radiation for defect detection, enabling online and contactless identification of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If contactless detection method is used, then detection complexity is reduced and waste is minimized, but detection precision for internal defects is insufficient
Solution Approach 1:
The patent replaces mechanical contact-based detection systems with terahertz radiation-based non-contact detection. The terahertz system emits radiation that penetrates the pipe wall and interacts with internal defects like extrusion residue, detecting them through radiation signal changes without physical contact with the product
Solution Approach 2:
The patent utilizes changes in terahertz radiation parameters (absorption, reflection, transmission) when the radiation interacts with defects inside the pipe. By monitoring these parameter changes in the radiation signals, the system can precisely detect internal defects while maintaining non-contact operation
2Reliability
If offline detection method is used, then detection thoroughness is improved, but productivity is reduced due to production interruption
Solution Approach 1:
The patent implements detection during the production process itself rather than after completion. The terahertz detection system operates continuously alongside the extrusion process, enabling real-time identification of defects like extrusion residue before they cause problems downstream, thus maintaining both thoroughness and productivity
Solution Approach 2:
The patent enables continuous detection throughout the production process. The terahertz radiation system operates continuously as the pipe moves through the detection zone, providing uninterrupted monitoring of internal defects without interrupting the extrusion process, thereby maintaining both detection reliability and production continuity
3Productivity
If high conveying speed is used, then productivity is improved, but detection accuracy deteriorates due to motion blur and signal variability
Solution Approach 1:
The patent replaces mechanical measurement systems that would be affected by high-speed motion with terahertz radiation-based detection. The radiation-based system captures defect information through electromagnetic interaction rather than physical measurement, eliminating motion blur effects and enabling accurate detection at high conveying speeds
Solution Approach 2:
The patent uses periodic modulation of the terahertz radiation signal to synchronize with the pipe movement. By employing periodic detection cycles and analyzing the temporal pattern of radiation signal changes, the system can accurately locate defects even at high conveying speeds, converting the motion into a detectable periodic signal pattern
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
Enables reliable, real-time detection of defects with minimal waste, even at high conveying speeds, by distinguishing defect-induced changes from lateral movements, using terahertz radiation's sensitivity to material and geometric anomalies.
Implementation Method 1
terahertz radiation is emitted by at least one transmitter onto the strand-like product conveyed in the conveying direction and terahertz radiation reflected by the strand-like product is received by at least one receiver
Data Source
AI summary
A method is provided for detecting a defect of a strand-like product conveyed in a conveying direction at a conveying speed of more than 50 m/min. The method includes determining a frequency of a lateral movement of the strand-like product. The lateral movement occurs in a direction that is transverse to the conveying direction. Terahertz radiation is emitted at a wavelength by at least one transmitter onto the strand-like product conveyed in the conveying direction. The terahertz radiation is reflected by the strand-like product and received by at least one receiver. A temporary change in the terahertz radiation received by the at least one receiver is detected. A defect in the strand-like product is inferred when the temporary change in the terahertz radiation received by the at least one receiver is higher than the frequency of the lateral movement of the strand-like product.