Rotating Eddy Current Inspection for Precise Tubular Defect Mapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pipeline inspection devices face limitations in resolution and accuracy, are costly due to multiple sensors, and do not provide precise defect positioning, while introducing signal noise from slip-rings.
Innovation Solution
A cost-effective inspection device with scanning electronics and eddy current testing sensors mounted on a rotating body, avoiding signal noise from slip-rings, and featuring synchronized rotation with eddy current testing sensors to enhance accuracy and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to improve inspection resolution and accuracy, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines eddy current testing sensors with slip-ring components into an integrated rotating assembly. The eddy current sensors are mounted on the slip-ring structure, allowing multiple sensing functions to be performed by a single combined component rather than separate sensors, thereby reducing overall device complexity while maintaining inspection accuracy
Solution Approach 2:
The slip-ring structure serves multiple functions: it provides electrical connection for power and data transmission, acts as a mechanical support structure, and serves as the mounting platform for eddy current sensors. This multi-functionality eliminates the need for separate sensor housings and support structures, reducing device complexity
2Adaptability or versatility
If slip-rings are used to enable rotation, then adaptability to various diameters is improved, but signal noise increases
Solution Approach 1:
The patent introduces synchronous timing as an intermediary mechanism to separate the rotational motion function from the signal transmission function. By synchronizing sensor activation with rotational position and using timing-based signal separation, the system can tolerate the presence of slip-rings without allowing them to generate excessive noise, as the timing synchronization filters out inconsistent signals
3Reliability
If synchronized rotation with eddy current testing sensors is implemented, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The synchronization mechanism is merged with the existing rotational drive system. The same motor that rotates the slip-ring assembly also drives the eddy current sensors, and the control system uses the motor's timing signals to synchronize sensor activation. This eliminates the need for separate synchronization hardware, reducing the complexity increase while maintaining improved signal-to-noise ratio
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 high-resolution defect detection with reduced signal noise, providing accurate positioning and characterization of defects on tubular goods, including cracks and corrosion, with improved signal-to-noise ratio and adaptability to various diameters.
Implementation Method 1
eddy currents are generated at the surface of the tube and characteristics of eddy currents generated are measured over time
Implementation Method 2
a steady state alternating current or pulsed current waveform in a test probe transmitter coil that is electromagnetically coupled near an electrically conductive test object. The changing current flow in the probe transmitter generates a changing transmitted magnetic field waveform that in turn induces a generated eddy current
Data Source
Figure 1~2
Figure 3
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).