Inclined Coil Eddy Current Probe for Inter-Coil Defect Detection
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Solution Overview
Problem
Eddy current flaw detecting probes face reduced detection performance when defects are positioned between the excitation coil and the detection coil, leading to inaccurate flaw detection.
Innovation Solution
The eddy current flaw detecting probe is designed with multiple excitation and detection coils that are inclined towards the inspection target surface, with specific configurations such as differential connection and staggered positions to enhance eddy current disturbance and voltage differences, allowing for improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the excitation coil and detection coil are disposed on the same surface without inclination, then the device structure is simple, but the detection accuracy of defects positioned between the coils deteriorates
Solution Approach 1:
The patent applies asymmetry by inclining the excitation coil and detection coil toward each other at a specific angle rather than keeping them parallel on the same surface. This asymmetric arrangement creates an optimized magnetic field distribution that enhances eddy current generation in the inspection target, particularly improving detection of defects positioned between the coils while maintaining structural feasibility
Solution Approach 2:
The patent changes the geometric parameters of the coil arrangement by introducing an inclination angle between the excitation coil and detection coil. This parameter modification optimizes the magnetic coupling and eddy current distribution, thereby improving defect detection accuracy without significantly complicating the manufacturing process
2Measurement precision
If the excitation coil and detection coil are inclined toward each other, then the eddy current disturbance and voltage difference are enhanced improving detection accuracy, but the device structure becomes more complex
Solution Approach 1:
The asymmetric inclination of coils toward each other creates optimized magnetic field overlap and eddy current distribution, significantly enhancing defect detection capability while the complexity increase is limited to the coil mounting configuration
Solution Approach 2:
The patent transitions from a two-dimensional planar coil arrangement to a three-dimensional inclined configuration. This dimensional change allows the coils to approach each other in space, creating enhanced magnetic coupling and eddy current disturbance that improves detection accuracy with manageable structural complexity
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 configuration significantly enhances the detection accuracy of defects positioned between the excitation and detection coils, improving the overall flaw detection performance.
Implementation Method 1
an eddy current is generated on a surface of an inspection object by an excitation coil
Implementation Method 2
a voltage change (or impedance change) of a detection coil due to influences of the eddy current is observed
Implementation Method 3
Eddy current between the excitation coil and the detection coils is enhanced relatively
Data Source
AI summary
An eddy current flaw detecting probe includes a plurality of excitation coils (3) which is configured to generate an eddy current in an inspection target and a plurality of detection coils (4) which are differentially connected to each other. The plurality of detection coils (4) includes a first detection coil (41) which is disposed on a second center line (4a) intersecting a first center line (3a) which connects a center of a first excitation coil (31) and a center of a second excitation coil (32) to each other and a second detection coil (42) which is disposed on a side opposite to the first detection coil (41) on the second center line (4a). The excitation coil (3) and the detection coil (4) are disposed to be inclined toward an inspection target surface as approaching each other.