Cellular Panel Shear Angle Measurement via Oblique X-Ray Imaging
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Solution Overview
Problem
Current methods for measuring the shear angle between cell walls and facesheets in cellular panels are destructive and ineffective with existing X-ray inspection techniques, as they cannot accurately differentiate between zero and nonzero shear angles, and cannot transmit through the entire panel.
Innovation Solution
A non-destructive imaging system using a radiation source and detector positioned at a tilt angle relative to the cellular panel to obtain images, allowing for the measurement of the projected shear angle and subsequent calculation of the actual shear angle between the interior wall and facesheet, utilizing equations such as tan θ = tan α * sin φ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current X-ray inspection techniques are used to measure shear angle, then non-destructive inspection is achieved, but the technique cannot accurately differentiate between zero and nonzero shear angles
Solution Approach 1:
The patent introduces a tilt angle dimension by positioning the X-ray source and detector at an angle φ relative to the panel normal. This dimensional change allows the projection of the shear angle θ to be magnified and differentiated from zero, resolving the inability of conventional normal-incidence X-ray inspection to distinguish shear angles.
Solution Approach 2:
The patent changes the inspection parameter from normal incidence to oblique incidence by introducing a specific tilt angle range (20°-50°). This parameter change transforms the X-ray projection geometry, enabling accurate shear angle measurement through the relationship tan(α) = tan(θ) * sin(φ), where α is the measured projection angle and θ is the actual shear angle.
2Measurement precision
If the panel is sliced into pieces for shear angle measurement, then direct measurement is possible, but the inspection becomes destructive
Solution Approach 1:
The patent replaces the mechanical slicing method with an X-ray imaging system. Instead of physically cutting the panel to measure shear angle, the invention uses oblique X-ray projection to non-destructively obtain the shear angle measurement, maintaining panel integrity while achieving measurement precision.
3Shape
If X-ray inspection is performed from a view parallel to the facesheet, then the entire panel length cannot be imaged, but the shear angle might be more visible
Solution Approach 1:
The patent uses oblique incidence X-ray imaging at a tilt angle φ between 20°-50° relative to the panel normal. This intermediate angular dimension provides both sufficient projection magnification to visualize shear angles and adequate X-ray transmission through the panel thickness to image the entire panel area.
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, non-destructive quantification of the shear angle, allowing for adjustments to the forming process and ensuring the panels meet specifications, improving the manufacturing efficiency and quality control of cellular panels.
Implementation Method 1
transmitting radiation from the radiation source to the detector through the cellular panel at the tilt angle to obtain an image
Data Source
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AI summary
A process (130) for determining an actual shear angle (θ) between an interior wall (30) and a facesheet (22, 24) of a cellular panel (20) using an imaging system (40) is disclosed. The imaging system includes a radiation source (44) and a detector (46) diametrically opposed to the radiation source. The process includes positioning (132) the cellular panel at a tilt angle (φ) relative to a line (50) extending between the radiation source and the detector, transmitting (134) radiation from the radiation source to the detector through the cellular panel at the tilt angle to obtain an image (62), measuring (136) a projected shear angle (α) in the obtained image, and determining (138) the actual shear angle between the interior wall and the facesheet using the tilt angle and the projected shear angle.