Abstract
For application in structural health monitoring, a folded patch antenna has been previously designed as a wireless sensor that monitors strain and crack in metallic structures. Resonance frequency of the RFID patch antenna is closely related with its dimension. To measure stress concentration in a base structure, the sensor is bonded to the structure like a traditional strain gage. When the antenna sensor is under strain/deformation together with the base structure, the antenna resonance frequency varies accordingly. The strain-related resonance frequency variation is wirelessly interrogated and recorded by a reader, and can be used to derive strain/deformation. Material properties of the antenna components can have significant effects on sensor performance. This paper investigates thermal effects through both numerical simulation and temperature chamber testing. When temperature fluctuates, previous sensor design (with a glass microfiber-reinforced PTFE substrate) shows relatively large variation in resonance frequency. To improve sensor performance, a new ceramic-filled PTFE substrate material is chosen for re-designing the antenna sensor. Temperature chamber experiments are also conducted to the sensor with new substrate material, and compared with previous design.
Original language | English |
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Title of host publication | Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012 |
Volume | 8345 |
DOIs | |
Publication status | Published - 2012 |
Publication type | A4 Article in conference proceedings |
Event | Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012 - San Diego, CA, United States Duration: 12 Mar 2012 → 15 Mar 2012 |
Conference
Conference | Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012 |
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Country/Territory | United States |
City | San Diego, CA |
Period | 12/03/12 → 15/03/12 |
Keywords
- Crack sensor
- Folded patch antenna
- Passive wireless sensor
- RFID
- Strain sensor
- Thermal effect
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics