Hillier, Aaron, Makarovaite, Viktorija, Gourlay, Campbell W., Holder, Simon J., Batchelor, John C. (2019) A Passive UHF RFID Dielectric Sensor for Aqueous Electrolytes. IEEE Sensors Journal, 19 (14). pp. 5389-5395. ISSN 1530-437X. E-ISSN 1558-1748. (doi:10.1109/JSEN.2019.2909353) (KAR id:73401)
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Official URL: http://dx.doi.org/10.1109/JSEN.2019.2909353 |
Abstract
The one step modification of a commercial RFID sensing tag is demonstrated using polydimethylsiloxane based thin film chemistry to construct reusable passive RFID sensors for changes in the dielectric properties of electrolyte solutions as a function of concentration. The effects of PDMS film thickness were characterized as a function of RFID sensor code value. The output sensor code of the RFMicron RFM2100-AER wireless flexible moisture sensor (taken between 800-860 MHz) was compared to readings taken when the tag was dry and when the tag had a water deposition on the sensor area. The effect of the direct application of liquid water to the tag was to alter the capacitance presented to the integrated chip which auto-tunes to correct for the reactance. By varying the thickness of the PDMS film between the interdigitated sensor and deposited liquid, the sensitivity of the tag to a high dielectric medium could be controlled. Aqueous salt solutions were tested on a 500 m thickness film. It was found that the sensing platform could be used as a means of measuring the concentration of various salt solutions within the range 0-2M, and in turn could be used as a passive UHF RFID dielectric measuring tool. The measurement capability of the platform was subsequently demonstrated using a reduced frequency range (845-865 MHz).
Item Type: | Article |
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DOI/Identification number: | 10.1109/JSEN.2019.2909353 |
Projects: | Foresight Fellowship in Manufacturing: Defining and Fabricating New Passive Bio-Sensing Wireless Tag Technologies. |
Uncontrolled keywords: | Radio Frequency Identification, RFID tags, chemical sensor, aqueous electrolyte |
Subjects: |
Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics. Nuclear engineering > TK7800 Electronics > TK7871.6 Antennas and waveguides > TK7871.67.M53 Microwave antennas |
Divisions: |
Divisions > Division of Natural Sciences > Biosciences Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts Divisions > Division of Natural Sciences > Physics and Astronomy |
Funders: | Engineering and Physical Sciences Research Council (https://ror.org/0439y7842) |
Depositing User: | John Batchelor |
Date Deposited: | 08 Apr 2019 08:56 UTC |
Last Modified: | 02 Feb 2024 09:57 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/73401 (The current URI for this page, for reference purposes) |
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