Rotating Eddy Current Sensor Head for Tubular Defect Mapping
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Solution Overview
Problem
Existing pipeline inspection devices for tubular goods, such as oil and gas pipelines, face limitations in resolution and accuracy due to the use of multiple sensors, high costs, and inadequate defect positioning, particularly when using eddy current testing.
Innovation Solution
A cost-effective inspection device with scanning electronics and eddy current testing sensors mounted on a rotating body, allowing simultaneous rotation at a controlled speed to minimize signal noise from slip-rings, combined with geometric profilometers for precise internal measurements, and arrays of eddy current sensors for defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to improve inspection resolution, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple eddy current sensors into a single integrated sensor head that rotates during inspection. This single sensor head performs the function of multiple stationary sensors, reducing device complexity while maintaining inspection resolution through rotational scanning and signal processing.
Solution Approach 2:
The patent employs a dynamic rotating sensor head that spins during the inspection process. This dynamic approach allows a single sensor to cover the entire circumference of the tubular good, replacing multiple static sensors and reducing overall device complexity while achieving comprehensive coverage.
2Measurement precision
If multiple sensors are deployed to enhance defect detection capability, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple sensor functions into a single rotating sensor head assembly. This consolidation reduces the number of individual sensor components that need to be manufactured, installed, and calibrated, thereby reducing manufacturing costs while maintaining defect detection capability through rotational scanning.
Solution Approach 2:
The rotating sensor head serves multiple functions simultaneously - it performs eddy current testing, measures rotational position, and tracks longitudinal position through the odometer mechanism. This multi-functionality eliminates the need for separate systems, reducing overall manufacturing cost.
3Reliability
If traditional eddy current testing is used, then defect detection is achieved, but signal noise from slip-rings degrades measurement precision
Solution Approach 1:
The patent replaces the mechanical slip-ring connection with a wireless or contactless signal transmission system between the rotating sensor head and the stationary body. This eliminates the mechanical contact that generates noise, improving signal quality while maintaining power and data transmission.
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 device achieves enhanced accuracy and cost-effectiveness by reducing signal noise and improving defect detection resolution to 2×2 mm with a signal-to-noise ratio of 8 dB, capable of detecting defects as small as 0.5×0.5 mm, while providing precise internal geometry mapping and defect characterization.
Implementation Method 1
For search of defects or properties of a material, eddy currents are generated at the surface of the tube and characteristics of eddy currents generated are measured over time.
Implementation Method 2
eddy currents are generated at the surface of the tube through electromagnetic coupling with a test probe transmitter coil
Data Source
AI summary
An inspection device (1) for a tubular good comprising a first body part (2) comprising odometer and profilometers, a second body part (4) rotatably mounted on the first body part, a body motor (5) arranged to rotate the second body part (4), whereas the second body part comprises at least one array of eddy current test sensors (7), and a scanning electronics (9).