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Evaluation of a Piezo-Actuated Sensor for Monitoring Elastic Variations of Its Support with Impedance-Based Measurements

1
Computational and Experimental Mechanics Laboratory, Universidad Autónoma de Manizales, Antigua Estación del Ferrocarril, edificio fundadores, C.P. 170001 Manizales-Caldas, Colombia
2
Institute of Physics of Materials, Czech Academy of Sciences, Zizkova 22, 61662 Brno, Czech Republic
3
Central European Institute of Technology (CEITEC)/Brno University of Technology, Technická 10, 61600 Brno, Czech Republic
4
Department of Oral Health, Universidad Autónoma de Manizales, Antigua Estación del Ferrocarril, Edificio Fundadores, C.P. 170001 Manizales-Caldas, Colombia
5
Centro de Innovación Roldán, C.P. 050024 Medellín-Antioquia, Colombia
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(1), 184; https://doi.org/10.3390/s19010184
Received: 29 November 2018 / Revised: 24 December 2018 / Accepted: 2 January 2019 / Published: 7 January 2019
(This article belongs to the Special Issue Ultrasound Transducers)
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Abstract

This study exposes the assessment of a piezo-actuated sensor for monitoring elastic variations (change in Young’s modulus) of a host structure in which it is attached. The host structure is monitored through a coupling interface connected to the piezo-actuated device. Two coupling interfaces were considered (an aluminum cone and a human tooth) for the experimental tests. Three different materials (aluminum, bronze and steel) were prepared to emulate the elastic changes in the support, keeping the geometry as a fixed parameter. The piezo device was characterized from velocity frequency response functions in pursuance to understand how vibration modes stimulate the electrical resistance through electrical resonance peaks of the sensor. An impedance-based analysis (1–20 kHz) was performed to correlate elastic variations with indexes based on root mean square deviation (RMSD) for two observation windows (9.3 to 9.7 kHz and 11.1 to 11.5 kHz). Results show that imposed elastic variations were detected and quantified with the electrical resistance measurements. Moreover, it was demonstrated that the sensitivity of the device was influenced by the type of coupling interface since the cone was more sensitive than the tooth in both observation windows. As a final consideration, results suggest that bio-structures (fruits and bone, among others) could be studied since these can modify naturally its elastic properties. View Full-Text
Keywords: structural health monitoring; bio-monitoring; piezo-actuated sensor; electromechanical impedance technique; elastic variations; vibration through teeth structural health monitoring; bio-monitoring; piezo-actuated sensor; electromechanical impedance technique; elastic variations; vibration through teeth
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tinoco, H.A.; Cardona, C.I.; Peña, F.M.; Gomez, J.P.; Roldan-Restrepo, S.I.; Velasco-Mejia, M.A.; Barco, D.R. Evaluation of a Piezo-Actuated Sensor for Monitoring Elastic Variations of Its Support with Impedance-Based Measurements. Sensors 2019, 19, 184.

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