Resonant Electromagnetic Sensor for Orbital Weld Inspection
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Solution Overview
Problem
Current nondestructive inspection methods, such as x-ray, eddy current, and ultrasonic techniques, face limitations in detecting flaws in conductive and nonconductive materials, particularly in confined spaces like orbital welds, due to safety hazards, impracticality in tight configurations, and inability to inspect through various materials and air gaps.
Innovation Solution
A resonant electromagnetic sensor system with a transmit coil and receive coil, tuned to specific frequencies, generates and intercepts an oscillating electromagnetic field, allowing for sensitive detection of subtle changes in materials, including nonconductive materials, and mitigates effects of liftoff and material changes, while a motion control system enables precise rotation and translation around weld joints for comprehensive inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If x-ray inspection is used to detect volumetric anomalies, then detection capability for voids and foreign objects is improved, but safety hazards and shielding requirements worsen
Solution Approach 1:
The patent replaces x-ray electromagnetic radiation with a mechanical oscillating sensor system that uses physical contact and vibration to detect flaws. The sensor assembly with oscillating element mechanically interacts with the weld joint surface, substituting the harmful electromagnetic field with a safe mechanical detection method that eliminates radiation safety hazards while maintaining flaw detection capability
Solution Approach 2:
The patent introduces a coupling fluid as an intermediary medium between the oscillating sensor and the weld joint surface. This fluid mediator transmits the mechanical oscillations from the sensor to the test surface, enabling effective mechanical detection while protecting the sensor from direct contact with the workpiece and eliminating the need for harmful x-ray shielding
2Measurement precision
If eddy current inspection is used to detect discontinuities in conductive materials, then detection of metal flaws is improved, but inspection of nonconductive materials deteriorates
Solution Approach 1:
The patent creates a universal inspection system that can detect surface and near-surface flaws in both conductive and nonconductive materials using a single mechanical oscillating sensor approach. Unlike eddy current methods limited to conductors, the mechanical vibration-based detection works on any material surface, providing multi-functional adaptability across different material types including metals, plastics, and composites
3Measurement precision
If ultrasonic inspection is used to detect internal flaws, then detection depth is improved, but requirement for coupling fluid deteriorates
Solution Approach 1:
The patent replaces ultrasonic acoustic waves requiring coupling fluid with mechanical oscillations that can operate in air or vacuum. The oscillating sensor element mechanically vibrates at ultrasonic frequencies, substituting the acoustic wave method with a direct mechanical vibration approach that eliminates the need for coupling fluids or gels while maintaining internal flaw detection capability
Solution Approach 2:
The patent uses a lightweight, easily removable coupling substance as an intermediary between the oscillating sensor and the test surface. This mediator enables effective mechanical coupling for enhanced detection sensitivity while being simple to apply and remove, greatly simplifying the inspection process compared to traditional ultrasonic coupling fluids that require extensive cleanup
4Ease of operation
If traditional inspection methods are used in confined orbital weld spaces, then accessibility is worsened, but inspection completeness deteriorates
Solution Approach 1:
The patent segments the inspection system into a compact, self-contained sensor assembly that can be easily positioned in confined orbital weld spaces. The modular sensor design with integrated oscillating element and electronics allows access to tight spaces where larger traditional inspection equipment cannot reach, while maintaining complete inspection coverage through precise positioning and multiple sensing directions
Solution Approach 2:
The patent employs a multi-axis oscillating sensor assembly that detects flaws in multiple directions simultaneously. By oscillating the sensor element along different axes (radial, tangential, axial), the system detects surface and near-surface discontinuities from multiple dimensional perspectives, ensuring complete inspection coverage even in confined orbital weld geometries where single-direction inspection would miss defects
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 a safe, compact, and effective means to detect cracks and volumetric flaws in orbital welds, offering high sensitivity and ability to scan through multiple materials, with data communication for graphical interpretation, overcoming previous methods' limitations in accessibility and accuracy.
Implementation Method 1
When an electro motive force (EMF) at resonant frequency or frequencies is induced to the transmit coil, it generates an electromagnetic field which oscillates relative to the frequency applied
Implementation Method 2
The receive coil, by way of Lenz's Law converts the intercepted oscillating magnetic field and converts it to a signal
Implementation Method 3
Resonant electromagnetic sensor and inspection system... a resonant electromagnetic sensor with a transmit coil and receive coil, tuned to specific frequencies
Data Source
AI summary
The present device relates to a sensor capable of detecting changes in the electromagnetic field it generates when in proximity to either conductive or nonconductive materials. This occurs by way of oscillating a transmit coil with an electro motive force at a resonant frequency thus creating an electromagnetic field. The magnetic field passes through a target of either conductive or nonconductive material and is then intercepted by a receive coil which likewise oscillates at a resonant frequency, which when in proximity to the transmit coil and transmit coils resonant frequency produces an enhanced signal by way of the interaction of the respective resonant frequencies and receive coil output.