Non-destructive Internal Feature Inspection via CT Cross-sections
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Solution Overview
Problem
Current methods for inspecting internal features of articles, such as gas turbine engine components, are often destructive and provide incomplete representations, as they rely on sectioning and grinding, which can be inaccurate and do not capture the full three-dimensional geometry.
Innovation Solution
A non-destructive inspection method using computed tomography scanning to generate a computerized three-dimensional representation of internal features, allowing for the measurement of characteristics from multiple cross-sections to determine compliance with design criteria, such as angular orientation, without physically altering the article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive sectioning and grinding methods are used to inspect internal features, then the internal geometry can be revealed for inspection, but the article is destroyed and measurement precision is compromised due to inaccuracies in sectioning and grinding
Solution Approach 1:
The patent creates a digital copy (computerized three-dimensional representation) of the internal feature through computed tomography scanning. This virtual model allows repeated measurements and analyses without physically altering or destroying the original article, thereby maintaining both measurement precision and article integrity simultaneously
Solution Approach 2:
The patent replaces the mechanical sectioning and grinding process with a computational imaging system. Instead of physically cutting and grinding the article to reveal internal features, a computed tomography scanner captures multiple two-dimensional images that are processed to generate a three-dimensional digital representation, eliminating mechanical damage while maintaining measurement accuracy
2Loss of information
If destructive sectioning is used to inspect internal features, then the internal geometry can be accessed, but the ground sample does not provide a full representation of the feature because the section is a two-dimensional, single plane through the feature
Solution Approach 1:
The patent transitions from two-dimensional single-plane sections to a three-dimensional digital representation. The computed tomography system captures multiple cross-sectional images at different planes through the internal feature, reconstructing a complete three-dimensional model that provides full geometric representation while avoiding the limitations of single-plane sections
Solution Approach 2:
The patent divides the internal feature into multiple cross-sectional slices through the object, capturing geometric information at different locations and depths. This segmentation approach allows comprehensive reconstruction of the three-dimensional geometry by combining information from multiple planes, providing complete geometric representation
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
Enables accurate and comprehensive non-destructive inspection of internal features, ensuring design criteria are met without damaging the article, providing a precise and reliable assessment of geometric characteristics.
Implementation Method 1
scanning the article to produce a computerized three-dimensional representation of an internal feature of the article
Implementation Method 2
A further embodiment to any of the foregoing embodiments includes scanning the article using computed tomography scanning
Data Source
AI summary
A method of non-destructively inspecting an article includes scanning an article to produce a computerized three-dimensional representation of an internal feature of the article. A measurement characteristic of the internal feature is then generated from a plurality of cross-sections through the computerized three-dimensional representation of the internal feature. The measurement characteristic is then used to determine whether the internal feature meets a design criterion.