Passive Wireless Mechanical Overload Sensing: Proof of Concept Using Agarose Hydrogels

Francisco Alfonso Alvarez Del Castillo Manzanos; Robert R. Hughes; Anthony J. Croxford

doi:10.1109/TIM.2023.3291741

Passive Wireless Mechanical Overload Sensing: Proof of Concept Using Agarose Hydrogels

Francisco Alfonso Alvarez Del Castillo Manzanos^*, Robert R. Hughes, Anthony J. Croxford

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

4 Citations (Scopus)

Abstract

This article presents a proof-of-concept system for a wireless, capacitance-based, mechanical overload sensor which uses an agarose hydrogel as the sensing element. Simultaneous compression and electrical studies showed that by reliably overloading the hydrogel at large mechanical strains, it fractures, experiencing irreversible changes to its capacitance. This irreversibility can be readily exploited using the hydrogel as the capacitive element of a resonant circuit, as fracturing the hydrogel results in an irreversible shift in the resonant frequency of the circuit. Furthermore, the use of a suitable inductive element for the circuit permits for the wireless interrogation of the system.

Original language	English
Article number	9509109
Journal	IEEE Transactions on Instrumentation and Measurement
Volume	72
DOIs	https://doi.org/10.1109/TIM.2023.3291741
Publication status	Published - 3 Jul 2023

Bibliographical note

Funding Information:
This work was supported in part by the Mexican National Council for Science and Technology [Consejo Nacional de Ciencia y Tecnologia (CONACYT)], the Bristol Center for Functional Nanomaterials (BCFN), and Inductosense Ltd.

Publisher Copyright:
© 1963-2012 IEEE.

Keywords

Mechanical overload
resonant frequency
sacrificial sensor
structural health monitoring (SHM)
wireless sensing

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abstract = "This article presents a proof-of-concept system for a wireless, capacitance-based, mechanical overload sensor which uses an agarose hydrogel as the sensing element. Simultaneous compression and electrical studies showed that by reliably overloading the hydrogel at large mechanical strains, it fractures, experiencing irreversible changes to its capacitance. This irreversibility can be readily exploited using the hydrogel as the capacitive element of a resonant circuit, as fracturing the hydrogel results in an irreversible shift in the resonant frequency of the circuit. Furthermore, the use of a suitable inductive element for the circuit permits for the wireless interrogation of the system.",

keywords = "Mechanical overload, resonant frequency, sacrificial sensor, structural health monitoring (SHM), wireless sensing",

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AU - Croxford, Anthony J.

N1 - Funding Information: This work was supported in part by the Mexican National Council for Science and Technology [Consejo Nacional de Ciencia y Tecnologia (CONACYT)], the Bristol Center for Functional Nanomaterials (BCFN), and Inductosense Ltd. Publisher Copyright: © 1963-2012 IEEE.

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AB - This article presents a proof-of-concept system for a wireless, capacitance-based, mechanical overload sensor which uses an agarose hydrogel as the sensing element. Simultaneous compression and electrical studies showed that by reliably overloading the hydrogel at large mechanical strains, it fractures, experiencing irreversible changes to its capacitance. This irreversibility can be readily exploited using the hydrogel as the capacitive element of a resonant circuit, as fracturing the hydrogel results in an irreversible shift in the resonant frequency of the circuit. Furthermore, the use of a suitable inductive element for the circuit permits for the wireless interrogation of the system.

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Passive Wireless Mechanical Overload Sensing: Proof of Concept Using Agarose Hydrogels

Abstract

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