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

Start Date

8-6-2019 3:55 PM

End Date

8-6-2019 4:15 PM

Meeting Name

INSPIRE-UTC 2019 Annual Meeting

Comments

This material is based upon work sponsored by the INSPIRE University Transportation Center through USDOT/OST-R grant #69A3551747126.

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)

Share

COinS
 
Aug 6th, 3:55 PM Aug 6th, 4:15 PM

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.