Planar MFL Array Imaging for Pipeline Weld Crack Detection
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Solution Overview
Problem
Existing pipeline defect in-line inspectors face limitations in spatial resolution and are susceptible to lift-off disturbances, particularly in recognizing circumferential weld cracks, which are critical for ensuring the safety of oil and gas pipelines.
Innovation Solution
A pipeline defect in-line inspector utilizing planar magnetic flux leakage array imaging with a magnetization module, magnetic flux leakage array imaging modules, and a synchronization module to achieve high-speed synchronous acquisition and precise image registration, enabling ultra-high spatial resolution imaging and robust anti-disturbance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discrete magnetic sensors are arranged in a straight line to form detection probes, then the device structure is simple and easy to manufacture, but the spatial resolution cannot exceed 1 mm due to the large volume of sensors
Solution Approach 1:
The patent transitions from one-dimensional linear array sensors to two-dimensional planar array sensors. The planar magnetic flux leakage array includes multiple magnetic sensors arranged in a plane, enabling ultra-high spatial resolution imaging by capturing magnetic flux leakage signals from multiple spatial positions simultaneously, thus exceeding the 1 mm resolution limit of linear arrays.
Solution Approach 2:
The patent divides the detection area into multiple discrete sensor positions within the planar array. Each magnetic sensor in the array independently detects magnetic flux leakage at its specific location, and the combined data from all segmented sensor positions reconstructs the defect image with ultra-high spatial resolution.
2Productivity
If detection probes move along the pipeline axis during inspection, then continuous pipeline coverage is achieved, but lift-off disturbance occurs due to weld reinforcement causing severe signal distortion
Solution Approach 1:
The patent introduces an image registration module as an intermediary that processes and corrects the magnetic flux leakage signals. This module performs image registration and fusion on data from multiple planar arrays, compensating for the lift-off disturbances caused by weld reinforcement and moving the probe along the pipeline, thereby restoring signal accuracy.
Solution Approach 2:
The patent employs feedback mechanisms through the image registration and fusion process. The system continuously adjusts and corrects the magnetic flux leakage signals based on registered images from previous positions, compensating for disturbances in real-time and maintaining reliable defect detection signals during pipeline inspection.
3Productivity
If multiple detection probes are arranged along the circumference to acquire magnetic flux leakage simultaneously, then inspection efficiency is improved, but the complexity of data processing and image registration increases
Solution Approach 1:
The patent merges data from multiple planar magnetic flux leakage arrays arranged along the pipeline circumference. The image registration module combines these multiple data sets into a unified three-dimensional defect image, achieving comprehensive pipeline inspection coverage while improving inspection efficiency through parallel data acquisition from multiple probes.
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 provides continuous, high-resolution magnetic flux leakage imaging with improved recognition of defects, including circumferential weld cracks, by minimizing data loss and spatial resolution degradation due to movement, thus enhancing pipeline safety.
Implementation Method 1
magnetic induction lines generated by the permanent magnet are coupled into the wall of the pipeline through the magnetic conductive structure, the magnetic induction lines conduct in the wall of the pipeline, forming closed magnetic induction line loops
Implementation Method 2
each planar magnetic flux leakage array imaging module is a planar micro-element array magnetic sensing unit, which is composed of magnetic sensing micro-elements arranged in planar array that convert magnetic signals into electrical or optical signals
Data Source
AI summary
A pipeline defect in-line inspector based on planar magnetic flux leakage array imaging. Based on existing magnetization module and existing plurality of planar magnetic flux leakage array imaging modules, a plurality of magnetic flux leakage image high-speed synchronous acquisition units are added into invention to realize high spatial resolution magnetic flux leakage imaging and obtain a plurality of magnetic flux leakage images under the movement state of pipeline defect in-line inspector. A location and magnetic flux leakage image synchronization module is added into the present invention to synchronize the plurality of magnetic flux leakage images with an acquisition location. An image synchronization module registers each two adjacent pluralities of magnetic flux leakage images by acquisition locations, data characteristics and physical model to obtain a pipeline magnetic flux leakage field distribution map of ultra-high spatial resolution, providing a data basis for quantitative evaluation and locating of defects of the pipeline.