3D Shoe Inner Surface Measurement Using Multi-Probe Stress Control
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Solution Overview
Problem
Existing methods for measuring the dimensions and elastic properties of hollow objects, such as shoes and pipes, face challenges including labor intensity, long measurement times, and distortion due to uneven pressure and the need for adhesive marking materials.
Innovation Solution
A device with multiple probes and a camera that creates a uniform state of stress on the surface, using a flat marking strip to build a 3D model by scanning with different forces to measure the original shape and elastic properties, reducing labor and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensing probe is used for measurement, then the device structure is simple, but the measurement time and labor intensity increase significantly
Solution Approach 1:
The measurement device is divided into multiple independent probes (at least two probes) that can simultaneously measure different points on the inner surface. Each probe is equipped with its own sensing element and marking, enabling parallel measurement operations that reduce total measurement time while maintaining manageable device complexity
Solution Approach 2:
The probes are designed to be nested within a common housing or support structure, allowing multiple measurement elements to be contained within a single device unit. This nesting approach enables simultaneous multi-point measurement while keeping the overall device structure compact and manageable
2Ease of operation
If manual surface traversal is required for measurement, then the measurement process is simple to control, but the labor intensity and measurement duration increase
Solution Approach 1:
The measurement task is segmented across multiple probes that can be positioned at different locations simultaneously. This allows the measurement process to cover the entire inner surface in fewer passes, reducing measurement duration while maintaining operational simplicity through coordinated probe movement
Solution Approach 2:
Multiple probes enable continuous measurement across the surface without requiring the device to be repositioned repeatedly. The probes can measure different segments of the inner surface in parallel, eliminating idle time between measurements and reducing overall measurement duration
3Device complexity
If probe pressure varies during measurement, then the measurement process is simpler, but the accuracy of measurement results deteriorates
Solution Approach 1:
Each probe is equipped with a sensing element that detects the actual pressure or contact force applied to the inner surface. This feedback information is used to adjust the probe positioning or force application, ensuring consistent measurement conditions and improving measurement accuracy while maintaining relatively simple device control
Solution Approach 2:
The device incorporates mechanisms to control and standardize the contact pressure parameter across multiple probes. By maintaining uniform pressure conditions during measurement, the system ensures consistent measurement accuracy without requiring complex active pressure control systems
4Reliability
If adhesive marking material is applied over the entire surface, then the marking coverage is complete, but the complexity of application and removal increases
Solution Approach 1:
Instead of applying marking material over the entire inner surface, the invention extracts the marking function to specific localized points where probes make contact. Small markings or indicators are placed only at these discrete measurement points, providing sufficient reference information for 3D reconstruction while dramatically simplifying the marking application and removal process
Solution Approach 2:
The marking material is applied with local quality - concentrated at specific probe contact points rather than uniformly distributed across the entire surface. This localized marking approach provides adequate reference information for measurement while reducing the complexity of application and removal compared to full-surface marking
5Measurement precision
If formfitting material with marking is fastened to the inner wall, then the marking provides good reference, but the true shape may be distorted if the material is not solid
Solution Approach 1:
The invention extracts the marking function from a continuous formfitting material to discrete rigid markers or indicators positioned at probe contact points. These localized markings provide reference information without requiring a continuous material layer that could distort the measured shape
Solution Approach 2:
Instead of using a physical formfitting material that copies the inner surface shape, the invention uses optical copying through camera imaging of discrete markings. The camera captures images of the markings on the inner surface, and 3D reconstruction algorithms generate the shape model without requiring physical contact material that could introduce distortion
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 solution significantly reduces measurement time and labor while improving accuracy by allowing the object to recover its original shape, enabling precise dimension and elastic property measurement with minimal distortion.
Implementation Method 1
a camera, through indicators located on probes that create a uniform state of stress on the surface to be measured, receives spatial data
Implementation Method 2
probes that create a uniform state of stress on the surface to be measured
Implementation Method 3
allowing the object to recover its original shape
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention relates to a measurement technique and is intended for measuring the shape, the inner dimensions and the elasticity of shoes. The measurement method applied for consists in using probes with indicators, which create stress on the surface to be measured. For tracing the shape of the inner surface of the shoe, a camera and a flat marking strip are used. On the basis of the total of images, a three-dimensional model of the inner surface of the shoe to be controlled is built, and the elastic properties are determined when scanning the object with different forces. The device comprises a body, a camera installed therein, two or more probes with indicators and a flat marking strip. The invention allows to increase accuracy, to reduce labour intensity and the time of measurements.