Eddy Current Probe Attitude Evaluation for Narrow Curvature Inspection
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Solution Overview
Problem
Existing eddy current flaw detection techniques face challenges in maintaining high sensitivity and reliability, especially when inspecting objects with narrow portions and small curvature radii, due to probe attitude changes, which can lead to reduced detection accuracy and false positives.
Innovation Solution
An eddy current flaw detection apparatus that includes an AC power source for generating excitation magnetic fields, detection coils for sensing induction magnetic fields, an output section for processing signals, a storage section for associating detection signals, and an evaluating section to assess probe attitude based on multiple detection signals, allowing for accurate evaluation of probe inclination and improved detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the probe is scanned on a complicated-shaped surface with three-dimensional shape change, then the probe can access the surface, but the probe attitude becomes difficult to control and maintain alignment with the surface normal
Solution Approach 1:
The patent implements feedback by using multiple detection coils to continuously monitor probe attitude during scanning. The detection signals from multiple coils are processed to determine the probe's inclination angle and direction, providing real-time feedback that enables correction of probe orientation to maintain alignment with the surface normal throughout the scanning process.
2Productivity
If the probe inclines during scanning, then the scanning process continues without interruption, but the detection sensitivity is reduced and ghost signals appear
Solution Approach 1:
The system continuously monitors probe attitude through multiple detection coils and provides feedback to maintain proper alignment. This feedback mechanism allows the scanning to proceed continuously while preventing inclination-induced sensitivity loss and ghost signal generation by actively correcting probe orientation during the scanning process.
3Measurement precision
If multiple detection coils are used to evaluate probe attitude, then the attitude evaluation accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent divides the detection function into multiple separate detection coils arranged in specific configurations. Each coil contributes to measuring different aspects of the probe's attitude, and the segmented measurement data are combined to achieve comprehensive and accurate probe orientation evaluation, resolving the complexity through functional segmentation.
4Area of stationary object
If the probe is scanned on narrow portions with small curvature radius, then the inspection coverage is improved, but the probe attitude stability deteriorates
Solution Approach 1:
The feedback mechanism using multiple detection coils becomes particularly valuable when scanning narrow portions with small curvature radii. The continuous attitude monitoring and correction enabled by the multi-coil system compensates for the inherent instability encountered on tight curves, maintaining detection reliability even in geometrically challenging areas that expand inspection coverage.
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 enables reliable flaw detection with improved sensitivity and accuracy, even on complex surfaces with small curvature radii, by quantitatively evaluating probe attitude and adjusting scanning parameters to maintain optimal alignment with the inspection object's surface normal.
Implementation Method 1
an eddy current is generated on the surface of an inspection object by applying, to the inspection object, an excitation magnetic field from an excitation coil connected to an AC power source
Implementation Method 2
an induction magnetic field induced by the eddy current is detected by a detection coil
Data Source
AI summary
There is provided an eddy current flaw detection technique capable of, even when inspecting an object having a narrow portion with a small curvature radius, recognizing detection sensitivity change due to change of attitude of a probe.An eddy current flaw detection apparatus 10 includes: an AC power source 14 which generates an excitation magnetic field in each of excitation coils 12a accommodated in a probe 11 to excite an eddy current in an inspection object 13; a detecting section 15 which detects a detection signal generated by an induction magnetic field induced by the eddy current in each of detection coils 12 accommodated in the probe 11; an output section 16 which outputs flaw detection data based on the detection signals; a storage section 17 which mutually associates and stores the detection signals detected at the same timing from the plurality of coils 12b; and an evaluating section 18 which evaluates an attitude of the probe 11 based on the plurality of detection signals detected at the same timing and associated with each other.