CFRP Antenna NDT for Imperfection Localization
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Solution Overview
Problem
Current non-destructive testing methods for carbon-fiber composites lack sufficient spatial resolution to accurately locate imperfections within the materials, particularly in identifying damage such as fiber breakage or delamination.
Innovation Solution
A measuring method and arrangement that applies an electric input signal to the conductive material to transmit an electromagnetic output signal with a frequency spectrum, using an antenna detection system to probe and analyze the spatial origin of contributing frequencies, allowing for the localization of imperfections within the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dipole antenna is built from two woven CFRP laminates to detect damage wirelessly, then the monitoring capability is improved, but the spatial resolution to locate damage is insufficient
Solution Approach 1:
The patent segments the frequency spectrum of the electromagnetic output signal into different frequency components. Each frequency component corresponds to a specific spatial location or type of imperfection. By analyzing the frequency spectrum rather than treating the signal as a whole, the system can distinguish and locate different imperfections with improved spatial resolution.
Solution Approach 2:
The patent transforms the problem from spatial domain to frequency domain by analyzing the frequency spectrum of the electromagnetic output signal. This dimensional transformation allows imperfections to be distinguished and located through their characteristic frequencies, providing improved spatial resolution without requiring physical segmentation of the antenna.
2Measurement precision
If the frequency spectrum of the electromagnetic output signal is analyzed as a function of position and direction, then the spatial origin of contributing frequencies can be determined, but the device complexity increases
Solution Approach 1:
The CFRP material itself serves as the antenna, eliminating the need for separate antenna structures. The material under test performs the function of both the object being examined and the sensing element, simplifying the overall system while enabling frequency-based localization of imperfections.
Solution Approach 2:
The CFRP material serves multiple functions: it is both the structural material being tested and the antenna that transmits electromagnetic signals. This multi-functionality reduces system complexity by eliminating separate components while maintaining the capability to detect and locate imperfections through frequency spectrum analysis.
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 provides improved spatial resolution for identifying and distinguishing different defective areas within the material by analyzing the emitted radiation's frequency spectrum, enabling precise localization of imperfections.
Implementation Method 1
applying an electric input signal with an electric signal generator to the electrically conductive material such that the electrically conductive material acts as an antenna and thereby transmits an electromagnetic output signal
Data Source
AI summary
A measuring method for locating an imperfection in an electrically conductive material comprises applying an electric input signal with an electric signal generator to the electrically conductive material such that the electrically conductive material acts as an antenna and thereby transmits an electromagnetic output signal having a frequency spectrum comprising a contributing frequency corresponding to the imperfection within the electrically conductive material; receiving the electromagnetic output signal with an antenna detection system, wherein the antenna detection system probes the frequency spectrum of the electromagnetic output signal as a function of at least one of position and direction; and locating the imperfection within the electrically conductive material by analyzing with an analysis device a spatial origin of the contributing frequency within the frequency spectrum of the received electromagnetic output signal.