Integrated Eddy Current Probe for Signal Integrity
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Solution Overview
Problem
Eddy current testing of long tubes, such as those used in steam generation, faces interference and decreased signal-to-noise levels due to long cabling between measurement electronics and probe sensors, which affects the accuracy of non-destructive testing.
Innovation Solution
An integrated eddy current testing instrument with a probe head and connector module connected by a rigid or flexible shaft, incorporating a central processor, digital processing circuit, and signal drive amplifier, which includes signal conditioning and drive circuitry to reduce interference by placing measurement electronics closer to the coils within the tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If long cabling is used to connect measurement electronics to probe sensors for testing long tubes, then the testing coverage is improved, but signal quality deteriorates due to interference and decreased signal-to-noise levels
Solution Approach 1:
The patent combines the measurement electronics and probe sensors into a single integrated probe unit that can be inserted into the tube. This merging eliminates the need for long external cabling while maintaining the ability to test long tubes, thereby preserving signal quality without sacrificing testing coverage.
2Device complexity
If measurement electronics are placed outside the tube, then device complexity is reduced, but signal integrity deteriorates due to interference from long cabling
Solution Approach 1:
The measurement electronics are integrated directly into the probe housing that is inserted into the tube. This consolidation maintains signal integrity by eliminating long external cables, while the modular probe design keeps the overall system manageable and not excessively complex.
3Measurement precision
If measurement electronics are integrated within the tube, then signal-to-noise ratio is improved, but device complexity increases due to housing and power requirements
Solution Approach 1:
The probe integrates measurement electronics, power supply, and housing into a single compact unit that can be inserted into the tube. This merging improves signal-to-noise ratio by eliminating external cabling while the modular design keeps the complexity manageable through integrated power and compact electronics housing.
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 enhances signal quality and reduces interference, improving the accuracy and reliability of eddy current testing by integrating electronics within the tube, thereby maintaining signal integrity and noise reduction.
Implementation Method 1
An alternating current is applied to an excitation coil placed in close proximity to the metal object under test. The alternating current in the excitation coil induces an alternating current in the object
Implementation Method 2
The alternating current in the excitation coil induces an alternating current in the object
Data Source
AI summary
An eddy current instrument for non-destructive testing of a tubular metallic object, the instrument comprising a probe head with probe coils and probe coil signal conditioning and analog to digital conversion electronics and a probe connector module with a processor and probe coil excitation signal generation electronics. The probe connector processor is configured to interface to an external computing device, which may be a personal computer. The probe head and probe connector module may be connected by a rigid shaft or by a flexible coupling.