Non-Contact Fiber Permeability Measurement via Capacitance
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Solution Overview
Problem
Existing fiber permeability measurement systems face challenges in differentiating the resin wavefront in nontransparent molds and measuring conductive fibers, limiting their application due to contact-based capacitance issues.
Innovation Solution
A non-contact fiber permeability measurement system using a mold device, fluid supplying device, capacitance detecting device, and permeability converting device, which includes an upper and lower plate forming an accommodating space, allowing for non-contact capacitance detection and conversion to permeability, enabling measurement of both conductive and non-conductive fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a contact measurement system is used to measure fiber permeability, then the measurement can be performed with existing equipment, but the capacitance detecting device cannot be generated when measuring conductive fibers such as carbon fiber
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the capacitance detecting device and the conductive fibrous fabric. This insulating layer prevents direct electrical contact that would short-circuit the capacitor, while still allowing the electric field to penetrate and detect the fluid wavefront. The insulating layer thus mediates between the need for capacitance detection and the presence of conductive materials.
Solution Approach 2:
The patent replaces the traditional contact-based measurement system with a non-contact capacitance detection system. Instead of using physical contact between the measuring device and the fibrous fabric, the system uses electric field interaction through the insulating layer to detect fluid infiltration, thereby avoiding the problem of capacitance short-circuiting with conductive fibers.
2Loss of information
If a high speed camera is used to record the wavefront of resin, then the fluid flow can be visualized, but the wavefront cannot be differentiated when the mold is nontransparent or the fluid color is similar to the fibrous fabric color
Solution Approach 1:
The patent replaces the optical-based high speed camera system with an electrical-based capacitance detection system. Instead of relying on visual differentiation of the fluid wavefront, the system uses capacitance changes caused by fluid infiltration to detect and measure the wavefront, eliminating the need for transparent molds or contrasting fluid colors.
Solution Approach 2:
The patent changes the measurement parameter from optical properties (visibility, color contrast, transparency) to electrical properties (capacitance). By measuring capacitance changes rather than visual wavefront progression, the system can detect fluid infiltration regardless of mold transparency or fluid color matching with the fibrous fabric.
3Adaptability or versatility
If a non-contact measurement system is implemented, then the capacitance detecting device is protected from damage and application scope is expanded, but the system complexity increases with multiple components
Solution Approach 1:
The insulating layer serves as a protective intermediary that allows the capacitance detecting device to operate in a non-contact manner. This protects the detecting device from damage while maintaining the ability to measure both conductive and non-conductive fibers, expanding application scope despite the added component.
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 system effectively measures fiber permeability without damaging the capacitance detecting device, allowing for wider application, including high-pressure fluids and conductive fibers, by converting detected capacitance into permeability using software like LabVIEW and MATLAB, achieving accurate results as shown in measurement data.
Implementation Method 1
The capacitance detecting device is electrically connected to an outer surface of the upper plate and an outer surface of the lower plate and for detecting a capacitance of the accommodating space
Data Source
AI summary
A non-contact fiber permeability measurement system includes a mold device, a fluid supplying device, a capacitance detecting device and a permeability converting device. The mold device includes an upper plate, a lower plate and a fluid inlet. The lower plate is parallel to and disposed below the upper plate for forming an accommodating space disposing a measured fibrous fabric insulated against the upper plate and the lower plate. The fluid inlet is disposed through the upper plate. The fluid supplying device is connected to the mold device and for providing a fluid perfused from the fluid inlet into the accommodating space. The capacitance detecting device is electrically connected to the upper plate and the lower plate. The permeability converting device is electrically connected to the capacitance detecting device and for receiving the capacitance detected via the capacitance detecting device to convert the capacitance to a permeability.