Pipeline Eddy Current Probe With Passive Resonance Coil Coupling
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Solution Overview
Problem
Existing eddy current testing probes for pipelines face challenges with low sensitivity and small lift-off height due to poor coupling between the excitation coil and receiving coil, limiting their effectiveness in detecting defects within pipelines.
Innovation Solution
The introduction of a mobile carrier with a probe testing assembly that includes an excitation coil, a receiving coil, and a passive resonance coil, along with an elastic testing element and a sealing rubber cup, enhances the coupling between the coils, allowing for improved sensitivity and lift-off height, enabling more effective defect detection within pipelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional eddy current testing probes are used, then the testing process is simple, but the coupling degree between excitation coil and testing coil is poor, resulting in low sensitivity and small lift-off height
Solution Approach 1:
A passive resonance coil is introduced as an intermediary component between the excitation coil and the testing coil. This resonance coil acts as a mediator to enhance the coupling degree between the two coils, improving the sensitivity and lift-off height of the testing probe without requiring complex external coupling devices
Solution Approach 2:
The testing probe is designed with a nested structure where the passive resonance coil is positioned between the excitation coil and the testing coil within the same probe housing. This nested arrangement allows multiple functional coils to work together in a compact configuration, improving coupling while maintaining device simplicity
2Measurement precision
If magnetic flux leakage testing is used, then defect detection capability is improved, but the equipment becomes heavy and requires more stringent cleanliness requirements
Solution Approach 1:
The patent replaces the heavy mechanical magnetic flux leakage testing system with a lighter eddy current testing system that uses electromagnetic induction. The eddy current probe generates alternating magnetic fields to induce eddy currents in the pipeline, detecting defects through changes in the electromagnetic field rather than requiring heavy magnetic yokes and mechanical contact
Solution Approach 2:
The testing method changes from magnetic flux leakage (requiring ferromagnetic materials and heavy equipment) to eddy current testing (applicable to conductive materials). This parameter change in the physical principle allows for lighter equipment weight while maintaining defect detection capability through electromagnetic field interactions
3Reliability
If ultrasonic testing is used, then internal defects can be detected, but the testing speed is lower and requires couplant application
Solution Approach 1:
The patent replaces ultrasonic testing (which requires mechanical contact with couplant) with eddy current testing that uses electromagnetic fields. This substitution eliminates the need for couplant application and mechanical contact, allowing for non-contact or minimal-contact testing that maintains higher testing speeds while detecting surface and subsurface defects through electromagnetic induction
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 improves the sensitivity and lift-off height of the testing probe, allowing for accurate detection of pipeline defects at higher lift-off heights, enhancing the defect detection capacity and flexibility of the device while reducing system volume and cost.
Implementation Method 1
An eddy current field is formed via induction on the surface of a tested piece (tested specimen) under the effect of a varying magnetic field produced by the excitation coil
Implementation Method 2
An eddy current field is formed via induction on the surface of a tested piece (tested specimen) under the effect of a varying magnetic field produced by the excitation coil
Data Source
AI summary
The invention discloses an NDT device for pipeline, belonging to the field of NDT, including a mobile carrier, which moves with fluid in pipeline or is moved by an actuator; a probe testing assembly, which includes a testing component installed on the mobile carrier and having a testing element in which testing probe is encapsulated; a data processing unit, a first signal conditioning unit and a second signal conditioning unit, wherein the testing probe includes an excitation coil, a receiving coil and a passive resonance coil between the excitation coil and the receiving coil. For the invention, no more magnetizing treatment device is needed for testing, so that the system volume is greatly reduced, thereby reducing the requirement of the testing system of the invention on the internal cleanliness of a pipeline, improving flexibility of equipment in the pipeline of the testing system, and greatly reducing the system cost.