Abstract
This paper describes the design of a battery-assisted Ultra-High Frequency (UHF) Radio-Fre- quency IDentification (RFID) tag suitable for embedding in concrete materials and its measurement in a mortar slab. The device is built to communicate wirelessly not only the ID number of the RFID chip but also the digitalized output of a strain gauge sensor. Design optimizations of the RFID antenna is based on published permittivity and conductivity values of concrete. Experimental read ranges are measured from 800 to 1000 MHz with the help of commercial test equipment. Reading is possible up to 50 cm from the surface of a mortar block for a tag embedded 5 cm below the surface. This result is the first published one for RFID tags embedded in concrete or mortar.
Highlights
Structural deficiencies in concrete structures often originate at their core from micro scale defects, whose detection is the key to predict structural ageing
A flexible strain gauge based on carbon nanotubes on Ethylene Tetrafluoroethylene (ETFE) was recently proposed by the authors showing highly reproducible, hysteresis-free performances [1]
Ultra-High Frequency (UHF) Radio-Frequency IDentification (RFID) is appealing in this regard as embedded RFID tags can either be used in their battery-less mode or require very low energy in their battery-assisted mode
Summary
Structural deficiencies in concrete structures often originate at their core from micro scale defects, whose detection is the key to predict structural ageing For this purpose, a flexible strain gauge based on carbon nanotubes on Ethylene Tetrafluoroethylene (ETFE) was recently proposed by the authors showing highly reproducible, hysteresis-free performances [1]. This paper presents the first description of the wireless communication part of a strain sensor node buried inside a concrete structure and built around one of these chips. It includes the design and fabrication issues as well as an experimental validation and a sensitivity analysis upon the variability of the concrete characteristics
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