Abstract
This paper presents a capacitive displacement sensor based on a capacitively fed inverted-F antenna (CFIFA) for displacement detection. The sensor is composed of a grounded L-shape patch and a rectangular upper patch, forming a capacitor between them. The asymmetric dipole model is adopted to explain the frequency shift and current distribution of the proposed antenna sensor at its first-order resonance. The numerical simulation of the CFIFA using the Ansoft high-frequency structure simulator (HFSS) software is carried out to optimize the dimensional parameters, allowing the antenna to perform better. Two sets of CFIFAs are fabricated and tested for verification. Results show that the CFIFA has a good linear relationship between its first resonant frequency and the relative displacement, and is capable of a long range of displacement measuring.
Highlights
Civil structures form our built environment and affect the human, social, ecological, economic, cultural, and aesthetic aspects of societies [1]
This section describes the origin of using the capacitive feed method to design the capacitively fed inverted-F antenna and presents a monopole equivalent model to explain the variation of the CFIFA’s resonant frequency with displacement
The other two local minimum points of the curve are caused by CFIFA
Summary
Civil structures form our built environment and affect the human, social, ecological, economic, cultural, and aesthetic aspects of societies [1]. In the course of any building’s life, aging, environmental effects, and operational errors can cause severe structural degradation thereby bringing safety and financial concerns [2] To solve these problems, the health condition of structures needs to be evaluated at periodic intervals, which helps mitigate risks, prevent disasters, and plan maintenance activities in an optimized manner. Structural health monitoring (SHM) is a highly active area of research devoted to developing the tools and techniques needed for automatic structural-integrity assessments [3]. For this purpose, sensors are usually deployed to detect structural damage and transmit data to data acquisition systems for signal processing and analysis. Sensors can be divided into wired and wireless types in general
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