3D Eddy Current Flaw Detection on Complex Surfaces
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Solution Overview
Problem
Eddy current flaw detection systems struggle to accurately display and evaluate flaws on complex three-dimensional inspection surfaces, such as the weld between a reactor pressure vessel and a stub tube, due to distortion caused by the probe's scan trajectory and substrate deformation, leading to inaccurate positioning and length evaluation of flaws.
Innovation Solution
An eddy current flaw detection system that uses a multi-coil probe with a flexible substrate, a scanning device to control the probe's attitude angle, and a data processing/display device to acquire and generate three-dimensional coordinates of detection points, creating three-dimensional flaw detection data and displaying results on a three-dimensional model of the inspection surface in color tones, ensuring accurate representation without distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-dimensional coordinate system is used to display scan area and detection results, then the display is simple and easy to implement, but distortion occurs on complex three-dimensional surfaces leading to inaccurate flaw position and length evaluation
Solution Approach 1:
The patent transitions from a two-dimensional coordinate system to a three-dimensional coordinate system for displaying scan areas and detection results. The three-dimensional coordinate acquisition unit acquires coordinates (x, y, z) for each detection point, and the display unit renders these on a three-dimensional model of the inspection surface. This dimensional upgrade eliminates distortion caused by projecting three-dimensional surface features onto a two-dimensional plane, thereby accurately representing flaw positions and dimensions on complex surfaces while maintaining systematic simplicity.
2Area of stationary object
If the probe is scanned on a complex three-dimensional surface, then the inspection coverage is improved, but the scan trajectory length varies across the probe surface causing distortion in detection results
Solution Approach 1:
The patent implements a dynamic coordinate acquisition system that adapts to the varying scan trajectory lengths across different portions of the probe surface. The scan control unit controls the scanning device to scan each portion of the probe, and the three-dimensional coordinate acquisition unit dynamically calculates the appropriate coordinates based on the actual scan trajectory for each detection point. This dynamic adjustment compensates for the varying path lengths, ensuring that detection results from different probe regions are accurately represented without distortion.
3Reliability
If the attitude angle of the probe is changed according to scan position, then the probe maintains close contact with the inspection surface, but distortion occurs in the two-dimensional coordinate representation of detection points
Solution Approach 1:
The patent resolves the coordinate distortion issue by transitioning to a three-dimensional coordinate system. The three-dimensional coordinate acquisition unit acquires coordinates that incorporate the varying attitude angles at different scan positions, and the display unit renders these three-dimensional coordinates on a three-dimensional model of the inspection surface. This approach preserves the accurate spatial relationships established by attitude angle adjustments while eliminating the distortion that would occur in a two-dimensional representation.
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
Enhances the accuracy of flaw detection display and evaluation by eliminating distortion, allowing for precise determination of flaw position and length on complex three-dimensional surfaces.
Implementation Method 1
causing an alternating magnetic field generated by an exciting coil to induce eddy currents in a surface layer portion of a conductive object
Implementation Method 2
detecting a disturbance in eddy currents due to a flaw or crack as a change (change in output voltage) in impedance of a detecting or sensing coil
Data Source
AI summary
An eddy current flaw detection system includes an eddy current flaw detection probe having a substrate facing an inspection surface, and at least one exciting coil and at least two detecting coils provided on the substrate, a scanning device which scans the probe on the inspection surface, a scan control device which drives and controls the scanning device, an eddy current flaw detection device which acquires results of detection of a plurality of detection points corresponding to combinations of the exciting and detecting coils for each scan position of the probe, and a data processing/display device which processes data from the scan control device and the eddy current flaw detection device and thereby displays a result of flaw detection. The data processing/display device acquires three-dimensional coordinates of the detection points for each scan position of the probe and thereby creates three-dimensional flaw detection data.