Flexible Sensor Assembly for Edge Discontinuity Detection
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Solution Overview
Problem
Existing inspection methods for detecting discontinuities in structures, such as cracks and breaks, face challenges due to strong edge signals overpowering signals from cracks, making it difficult to accurately detect small cracks buried within larger edge signals.
Innovation Solution
A flexible sensor assembly with overlapping sets of sensing coils and a drive coil, configured to generate a magnetic field parallel to the edge, allowing for improved detection of discontinuities by avoiding blind zones and effectively distinguishing edge signals from crack signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used to detect discontinuities, then the inspection process can be performed, but strong edge signals overpower signals from cracks, making it difficult to accurately detect small cracks
Solution Approach 1:
The sensor is divided into multiple independent sensing coils arranged in an array, with each coil capable of detecting signals from different locations. This segmentation allows the system to process and differentiate between edge signals and crack signals from various positions, improving crack detection accuracy despite strong edge signal interference
Solution Approach 2:
Different sensing coils are positioned at specific locations relative to the edge, with each coil optimized for its local detection zone. The first sensing coil is positioned closer to the edge while the second sensing coil is positioned farther away, creating local quality differences that enable the system to distinguish between edge signals and crack signals based on their spatial characteristics
2Reliability
If a single set of sensing coils is used, then the device complexity is reduced, but blind zones are created where cracks cannot be detected
Solution Approach 1:
The sensing system is segmented into multiple coils arranged in an array pattern, where each coil covers a specific detection zone. This segmentation eliminates blind zones by ensuring continuous coverage across the entire inspection area, with each coil contributing to the overall detection reliability
Solution Approach 2:
Multiple sensing coils are merged into a single integrated sensor assembly that functions as one cohesive unit. The coils are electrically connected and mechanically integrated, allowing the system to achieve comprehensive detection coverage while maintaining manageable device complexity through unified design
3Measurement precision
If the magnetic field is generated perpendicular to the edge, then the drive coil configuration is simple, but the sensing capability for edge-parallel discontinuities is reduced
Solution Approach 1:
The drive coil is positioned asymmetrically relative to the sensing coils, with the drive coil located at a specific offset distance from the sensing array. This asymmetric configuration optimizes the magnetic field distribution to enhance sensitivity for detecting edge-parallel discontinuities while maintaining practical device complexity
Solution Approach 2:
The magnetic field generation is oriented perpendicular to the traditional edge-normal direction, creating a field configuration that is optimized for detecting discontinuities parallel to the edge. This dimensional change in field orientation improves edge discontinuity detection capability while the overall device structure remains relatively simple
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 flexible sensor assembly enhances the detection of discontinuities by providing a continuous sensing capability along edges and surfaces, effectively reducing the impact of strong edge signals and improving the accuracy of crack detection.
Implementation Method 1
a drive coil selectably energizable to generate a magnetic field and extending in a first direction
Implementation Method 2
whereby the selective energizing of the drive coil is configured to generate eddy currents in the structure, and wherein the first and second sets of sensing coils are configured to sense interactions of the eddy currents in the structure
Data Source
AI summary
A sensor for a flexible sensor assembly includes a drive coil, a first set of sensing coils, a second set of sensing coils, and a configuration for sensing for discontinuities in a structure desired to be sensed. A method of operating the sensor can include positioning the sensor proximate to the structure, energizing the drive coil, and sensing eddy currents with the sensing coils.