Conductive Bonding Region Inspection via Eddy Current Impedance
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Solution Overview
Problem
Current methods for inspecting electrical conductivity in composite materials, particularly in conductive bonding regions of aircraft skin panels, are tedious and prone to error, requiring multiple measurements and skilled operators to ensure adequate lightning protection.
Innovation Solution
A system utilizing an alternating current source and a coil assembly with a conformable base to induce eddy currents and measure impedance properties, allowing for detection of defects at various material depths and providing visual and audio feedback for quick identification of conductivity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface conductivity measurements are made using multiple independent measurements and processing, then conductivity estimation accuracy is improved, but inspection time and complexity increase
Solution Approach 1:
The patent extracts the essential conductivity information by taking a single measurement at one location using a properly positioned probe, eliminating the need for multiple measurements across different locations. The probe design with specific geometric relationships allows one measurement to represent the entire bonding region's conductivity.
Solution Approach 2:
The patent replaces the complex mechanical process of making multiple measurements and manually processing data with a single probe positioning action. The probe's fixed geometric configuration substitutes for the multiple measurement points, and the direct measurement approach replaces the data processing step.
2Reliability
If multiple independent measurements are taken to estimate conductivity, then measurement reliability is improved, but ease of operation deteriorates due to requiring skilled operators
Solution Approach 1:
The probe design makes the measurement system self-calibrating and self-positioning through its fixed geometric relationships. The probe automatically establishes the correct measurement configuration when placed on the bonding region, eliminating the need for operator skill in positioning or multiple measurement techniques.
Solution Approach 2:
The patent changes the measurement approach from multiple spatial points to a single point with optimized probe geometry. By changing the probe's physical parameters (dimensions, spacing, configuration) to match the bonding region characteristics, the system achieves reliable measurements without requiring operator expertise in measurement techniques.
3Reliability
If thorough conductivity verification is performed, then lightning protection reliability is improved, but inspection complexity increases
Solution Approach 1:
The patent extracts the essential conductivity verification function into a single probe measurement, eliminating the complex multi-point measurement system while maintaining reliability for assessing lightning protection adequacy.
Solution Approach 2:
The patent replaces the complex inspection system requiring multiple measurements and data processing with a simple single-point measurement device that provides direct conductivity assessment sufficient for lightning protection verification.
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 system simplifies the inspection process by providing accurate and efficient detection of electrical conductivity, reducing the risk of errors and enabling quicker verification of electrical continuity in composite materials, thus enhancing lightning protection for aircraft.
Implementation Method 1
A system utilizing an alternating current source and a coil assembly with a conformable base to induce eddy currents and measure impedance properties
Implementation Method 2
A system utilizing an alternating current source and a coil assembly with a conformable base to induce eddy currents and measure impedance properties
Data Source
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AI summary
Systems (10) and methods for inspecting electrical conductivity in composite materials having conductive structures are disclosed. In one embodiment, a system of inspecting electrical conductivity in a conductive bonding region (18) includes a coil (14) coupled to an alternating current source (12) that is configured to induce a current in a conductive structure within the region. A processor (30) is coupled to the coil that is operable to detect an impedance property value from the coil that results from the current induced in the conductive structure.