Dual-Probe Eddy Current Detection for Steam Generator Tube Defects
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Solution Overview
Problem
Current defect detection methods in heat generating tubes, particularly in nuclear power stations, face challenges in rapidly and precisely identifying axial and circumferential defects, as well as accurately distinguishing material features that cause signal analysis errors due to magnetic phases, leading to potential contamination risks.
Innovation Solution
A dual-probe system comprising a bobbin type probe for axial defect detection and a yoke type probe for circumferential defect and material analysis, using magnetizing forces and signal processing to differentiate between defects and magnetic phase influences, enabling rapid, precise detection and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bobbin type probe is used for eddy current testing, then detection speed is improved (1 m per second), but measurement precision deteriorates because circumferential defects cannot be detected and signal analysis errors occur due to magnetic phase
Solution Approach 1:
The patent combines a bobbin type probe and a yoke type probe into a single integrated detection apparatus. The bobbin type probe detects axial defects with high speed, while the yoke type probe detects circumferential defects and magnetic phase. By merging these two probe types, the system achieves both high detection speed and comprehensive measurement precision for all defect types.
Solution Approach 2:
The detection apparatus is designed with multi-functional capability to detect multiple types of defects (axial and circumferential) and material properties (magnetic phase) using a single integrated system. The bobbin type probe handles axial defect detection while the yoke type probe handles circumferential defects and magnetic phase identification, creating a universal detection solution that eliminates the need for separate inspection procedures.
2Measurement precision
If a motorized rotating pan cake (MRPC) probe is used for detailed inspection, then measurement precision is improved, but productivity deteriorates due to low detection speed (5 mm per second)
Solution Approach 1:
The patent merges the high-speed detection capability of the bobbin type probe with the detailed inspection capability of the yoke type probe into a single integrated apparatus. This combination allows the system to perform both rapid screening and detailed detection simultaneously, eliminating the need to switch between different probe types and maintaining high productivity while achieving comprehensive measurement precision.
Solution Approach 2:
The detection function is segmented into two specialized probe types, each optimized for specific detection tasks. The bobbin type probe is optimized for high-speed axial defect detection, while the yoke type probe is optimized for circumferential defect and magnetic phase detection. This segmentation allows each component to excel at its specific function while working together to provide comprehensive high-speed, high-precision inspection.
3Productivity
If only axial defect detection is performed, then productivity is improved, but measurement precision deteriorates because circumferential defects and magnetic phase features are missed
Solution Approach 1:
The patent merges axial defect detection and circumferential defect detection capabilities into a single integrated apparatus that operates simultaneously. The bobbin type probe and yoke type probe work in parallel to detect different defect types, allowing the system to maintain high inspection efficiency while achieving comprehensive measurement precision for all defect orientations and material properties.
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 system allows for efficient detection of axial and circumferential defects, reducing the risk of contamination by accurately identifying material features and eliminating signal analysis errors, thereby enhancing operational safety and efficiency in nuclear power stations.
Implementation Method 1
a bobbin type probe forming a magnetizing force using a coil which is wound on at least one bobbin
Implementation Method 2
a yoke type probe forming a magnetizing force using a coil which is wound in an axial direction of at least one yoke
Data Source
AI summary
A detection apparatus for an eddy current in a heat generating tube using a permeability measurement method, and a method using the apparatus are provided. In the detection apparatus, a bobbin type probe acquires detection information with respect to a magnetic flux change by a magnetic phase occurring in the heat generating tube using a coil which is wound in an axis direction of at least one yoke located in a perpendicular direction with a bobbin of the bobbin type probe, and a material having a corresponding magnetic phase and a circumferential defect, which is difficult to be detected by the bobbin type probe, are detected based on the detection information.