Eddy Current Probe Alignment via Touch Probe Calibration
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Solution Overview
Problem
Current eddy current inspection methods are inefficient, costly, and pose safety risks due to manual alignment processes, which are time-consuming and prone to errors, especially when inspecting complex or hard-to-reach areas of aircraft engine components.
Innovation Solution
A method using a touch probe with a calibration plate to characterize the probe's radius and offset, allowing for automatic alignment of the eddy current probe by transferring these values to compensate for physical imperfections and variations, eliminating the need for alignment templates and reducing human intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment method is used, then probe can be aligned with component surface, but inspection time increases and productivity decreases
Solution Approach 1:
The patent replaces manual mechanical alignment with an automated optical alignment system using cameras and image processing. The system captures images of the component surface and automatically calculates probe positioning, eliminating manual intervention and significantly reducing inspection time while maintaining high alignment accuracy.
Solution Approach 2:
The alignment system performs self-alignment by automatically detecting component features and calculating optimal probe positions without human intervention. The system uses built-in cameras and processing units to autonomously complete the alignment process, transforming a labor-intensive manual task into an automated self-service operation.
2Measurement precision
If alignment template method is used, then probe alignment accuracy improves, but manufacturing cost and labor cost increase
Solution Approach 1:
The patent uses optical copying through cameras to capture the component surface geometry, replacing physical alignment templates. The camera system creates a digital copy of the component surface, allowing automated calculation of probe positions without requiring expensive physical templates for each inspection feature.
Solution Approach 2:
The optical alignment system serves multiple functions: it captures component geometry, calculates probe positions, and guides probe movement. This multi-functional approach eliminates the need for separate alignment templates and manual alignment procedures, reducing both manufacturing costs and inspection time.
3Measurement precision
If technician performs manual alignment, then probe alignment can be checked, but safety risks increase due to proximity to moving parts
Solution Approach 1:
The patent replaces manual visual inspection with an automated optical measurement system. Cameras capture images of the component surface and probe position, with image processing algorithms automatically verifying alignment. This eliminates the need for technicians to place their heads near moving parts, removing the safety hazard while maintaining alignment verification capability.
4Measurement precision
If small coils are used for inspection, then detection sensitivity improves, but probe maneuverability and positioning become more difficult
Solution Approach 1:
The automated alignment system performs self-positioning by automatically calculating and guiding the probe to the exact location and orientation needed for inspection. The system uses camera-based vision to track the probe position and adjust accordingly, enabling precise positioning of small coils without requiring manual dexterity or complex manual alignment procedures.
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 approach significantly reduces errors, increases inspection accuracy and efficiency, lowers production costs, and enhances safety by automating the alignment process, ensuring consistent probe pressure and precise signal capture.
Implementation Method 1
characterizing a touch probe with a calibration plate to find a probe radius and a probe offset of the touch probe
Implementation Method 2
An array of coils inside an eddy current probe generates alternating magnetic fields, which induce the eddy currents when the probe is moved near the component
Implementation Method 3
The altered eddy currents produce changes in a secondary magnetic field, which are detected by the array of coils inside the eddy current probe
Data Source
AI summary
A system and method using a touch probe device for eddy current inspection. The touch probe provides a simple approach for coming within close contact of the specimen while maintaining a normal angle and pressure at the right positions. The use of the touch probe further reduces the total time for the eddy current inspection. The touch probe aligns the probe to a specimen to be inspected, for the purpose of reducing measurement errors and increasing productivity.