Passive Wireless Antenna Sensor for Structural Strain and Crack Detection
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Solution Overview
Problem
Current damage detection technologies face challenges in efficiently measuring strain, temperature, crack, and fatigue in various structures, particularly due to limitations in precision, power requirements, and adaptability to complex geometries and materials like living tissue.
Innovation Solution
A passive wireless antenna sensor system using a dielectric substrate and patch antennas that measures frequency shifts and return loss to detect changes in strain, temperature, cracks, and fatigue, employing RF signals and backscattering for non-contact monitoring with no external power, small size, and conformability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If passive wireless antenna sensors are used for strain, temperature, crack and fatigue measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The antenna sensor system performs self-measurement by detecting changes in its own resonant frequency and return loss characteristics in response to structural parameters. The system requires no external power or active components, as the antenna itself serves as both the sensing element and the measurement device, thereby improving precision while avoiding additional complexity from power supplies or signal processing electronics.
Solution Approach 2:
The system measures structural parameters by detecting changes in the antenna's resonant frequency and return loss. Strain, temperature, cracks, and fatigue are quantified through their effects on these electromagnetic parameters, enabling precise measurement without complex mechanical or electronic sensing mechanisms.
2Adaptability or versatility
If passive wireless antenna sensors are used for strain, temperature, crack and fatigue measurement, then adaptability to complex geometries and materials is improved, but manufacturing precision requirements increase
Solution Approach 1:
The passive wireless antenna sensor serves multiple functions: it can measure strain, temperature, detect cracks, and assess fatigue on various structures including metallic, non-metallic, composite, and even living tissue. This multi-functionality is achieved through a single antenna design that responds to different physical parameters through changes in its electromagnetic characteristics, thereby improving adaptability while using standard manufacturing processes.
3Ease of operation
If passive wireless antenna sensors are used for strain, temperature, crack and fatigue measurement, then ease of operation is improved, but measurement precision may be affected by environmental factors
Solution Approach 1:
The system continuously monitors the antenna's resonant frequency and return loss characteristics, providing real-time feedback on structural parameters. This continuous measurement capability allows for easy operation and monitoring, while the system can detect and respond to environmental changes that may affect measurement precision.
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 continuous monitoring of structural conditions with high sensitivity and adaptability, providing distributed sensing capabilities and low manufacturing costs, suitable for metallic, non-metallic, and composite materials, including living tissue.
Implementation Method 1
measuring a frequency shift of the resonant frequency of a passive wireless antenna sensor
Implementation Method 2
employing RF signals and backscattering for non-contact monitoring
Data Source
AI summary
An apparatus and method is provided for monitoring a condition of a structure using a passive wireless antenna sensor having a known resonant frequency when mounted on the structure. A series of radio frequency signals are transmitted with sweeping frequencies around the known resonant frequency to the passive wireless antenna sensor. The passive wireless antenna sensor includes a dielectric substrate disposed between an antenna pattern and a ground plane such that a change in the condition of the structure will cause a change in one or more characteristics of the passive wireless sensor. A signal is received from the passive wireless antenna sensor and a resonant frequency of the passive wireless antenna sensor is determined based on the received signal. The determined resonant frequency is then compared to the known resonant frequency, whereby a change in the resonant frequency indicates a change in the condition of the structure.