S-Typed Array Eddy Current Probe for Tubular Defect Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional eddy current testing probes for tubular structures have limitations, including low detection accuracy, inability to detect circumferential cracks, and slow detection speed, as well as susceptibility to external environment influences like lift-off and probe inclination.
Innovation Solution
A built-in S-typed array eddy current testing probe with an exciting coil part and multiple pick-up coil parts, where the exciting coil wires are helically wound on a columnar coil former with specific angular distribution, forming differential eddy current testing units that reduce environmental interference and enable simultaneous detection of axial and circumferential defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Bobbin probe is used for eddy current testing, then the detection speed is fast, but the detection accuracy is low and circumferential cracks cannot be detected
Solution Approach 1:
The probe divides the detection function into multiple independent pick-up coil parts arranged in different orientations. Each pick-up coil part is responsible for detecting defects in specific directions, allowing simultaneous detection of axial and circumferential cracks while maintaining fast detection speed through parallel operation
Solution Approach 2:
The invention transitions from a single-direction detection approach to multi-directional detection by arranging pick-up coil parts in different spatial orientations. This dimensional expansion enables the probe to detect defects in multiple directions simultaneously, resolving the contradiction between speed and accuracy
2Measurement precision
If a rotating probe is used for eddy current testing, then the detection accuracy is high and C-scanning images can be acquired, but the detection speed is slow and the mechanical system is complex
Solution Approach 1:
The invention replaces the mechanical rotation system with a stationary array probe configuration. Instead of mechanically rotating a single coil to achieve multi-directional detection, the probe uses multiple fixed pick-up coil parts arranged in specific orientations, eliminating mechanical complexity while maintaining detection accuracy and improving speed through parallel detection
Solution Approach 2:
The invention transforms the static array configuration to dynamically scan through the tubular structure using the S-shaped movement pattern. This allows the probe to maintain a stationary detection configuration while achieving comprehensive coverage through controlled movement, improving both speed and accuracy
3Device complexity
If conventional eddy current testing probes are used, then the structure is simple, but they are susceptible to external environment influences such as lift-off and probe inclination
Solution Approach 1:
The invention assigns different functional characteristics to different parts of the probe. Each pick-up coil part has specific orientation and detection characteristics tailored to detect defects in particular directions. This local specialization allows the system to maintain reliability against environmental influences while keeping the overall structure relatively simple
Solution Approach 2:
The probe uses asymmetric arrangement of pick-up coil parts with different orientations rather than symmetric uniform distribution. This asymmetric configuration optimizes the probe's response to different defect types and reduces sensitivity to certain environmental disturbances like lift-off and inclination, improving detection stability
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 probe achieves high detection accuracy and speed for defects in various directions, effectively mitigating the impact of external factors like lift-off and probe inclination, allowing for reliable detection of both axial and circumferential defects.
Implementation Method 1
The eddy current testing technique is a nondestructive testing method established on the basis of electromagnetic induction principle
Implementation Method 2
The eddy current testing technique is a nondestructive testing method established on the basis of electromagnetic induction principle
Data Source
AI summary
A built-in S-typed array eddy current testing probe and a method for detecting defects of a tubular structure are provided. The probe includes an exciting coil part and a plurality of pick-up coil parts, wherein: the exciting coil part includes multiple bundles of exciting coil wires helically wound on a columnar coil former with a same interval; two bundles of exciting coil wires with an interval of 180° are connected at an end of the columnar coil former, actually being a same group of exciting coil wire bundles; each pick-up coil part consists of two rows of pancake coils; each four pancake coils which are closely arranged in a square shape form one differential eddy current testing pick-up unit; a final output signal is a result of additions between signals of opposite pancake coils and subtractions between signals of adjacent pancake coils in each differential eddy current testing pick-up unit.