Description
Passive wireless antenna sensors have been studied in recent years as a novel approach for strain sensing. Electromagnetic resonance frequency of the antenna sensor, which is bonded on a base structural surface like a strain gage, depends on antenna dimension. When the dimension changes due to strain in the base structure, the wirelessly identified resonance frequency shift can be used to estimate the strain in the structure. Due to the multi-physics nature, both mechanical and dielectric properties of the antenna affect the resonance frequency. One drawback of previous antenna sensors is the relatively large resonance frequency fluctuation due to temperature change. This paper investigates a new patch antenna sensor that performs more stably under thermal influence. Thermal influence on the new patch antenna sensor is investigated through a day-long outdoor test. Multi-physics simulation is performed to verify that the antenna resonance frequency changes with strain. The strain sensing performance of the antenna sensor is finally validated through laboratory compression test.
Location
St. Louis, Missouri
Presentation Date
06 Aug 2019, 3:55 pm - 4:15 pm
Meeting Name
INSPIRE-UTC 2019 Annual Meeting
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
text
Language(s)
English
Source Publication Title
Proceedings of the 9th International Conference on Structural Health Monitoring of Intelligent Infrastructure (2019: Aug. 4-7, St. Louis, MO)
Included in
Thermally-Stable Passive Wireless Antenna Sensor for Strain Sensing
St. Louis, Missouri
Passive wireless antenna sensors have been studied in recent years as a novel approach for strain sensing. Electromagnetic resonance frequency of the antenna sensor, which is bonded on a base structural surface like a strain gage, depends on antenna dimension. When the dimension changes due to strain in the base structure, the wirelessly identified resonance frequency shift can be used to estimate the strain in the structure. Due to the multi-physics nature, both mechanical and dielectric properties of the antenna affect the resonance frequency. One drawback of previous antenna sensors is the relatively large resonance frequency fluctuation due to temperature change. This paper investigates a new patch antenna sensor that performs more stably under thermal influence. Thermal influence on the new patch antenna sensor is investigated through a day-long outdoor test. Multi-physics simulation is performed to verify that the antenna resonance frequency changes with strain. The strain sensing performance of the antenna sensor is finally validated through laboratory compression test.
Comments
This material is based upon work sponsored by the INSPIRE University Transportation Center through USDOT/OST-R grant #69A3551747126.