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Sensors 2017, 17(6), 1284; doi:10.3390/s17061284

Design and Performance of a Metal-Shielded Piezoelectric Sensor

1
Institut d’Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC), Escola Politècnica Superior de Gandia (EPSG), Universitat Politècnica de València (UPV), 46730 Grau de Gandia, Spain
2
Instituto de Instrumentación para Imagen Molecular (i3M), Universitat Politècnica de València (UPV), Consejo Superior de Investigaciones Científicas (CSIC), 46022 València, Spain
3
Departamento de Física Aplicada, Universitat Politècnica de València (UPV), 46022 València, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 23 March 2017 / Revised: 27 May 2017 / Accepted: 30 May 2017 / Published: 4 June 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3467 KB, uploaded 4 June 2017]   |  

Abstract

In certain circumstances when acoustic measurements are required in the presence of explosive atmospheres the sensor must be placed inside a Faraday Cage. Piezoelectric active materials are suitable for this purpose as they do not need an electrical power supply, although the metal shielding can considerably reduce sensor sensitivity, which is already low at the acoustic frequency range (<20 kHz). This paper describes a metal-shielded piezoelectric sensor designed to work in the range of frequencies between 1 and 2 kHz and in these environmental conditions. The main idea was to add a thin material layer to the front face of the piezoelectric ceramic in order to force the system to vibrate in flexure mode at low frequencies. The resonant frequency and sensitivity of the system was studied as a function of the radius, thickness, and material of the thin layer. The study includes a comparison of theoretical model, FEM simulation, and real data measured using three aluminum and three steel prototypes of different sizes. View Full-Text
Keywords: acoustic sensor; piezoelectric ceramic; encapsulated transducer; piezoelectric FEM simulation; sensitivity; explosive atmospheres acoustic sensor; piezoelectric ceramic; encapsulated transducer; piezoelectric FEM simulation; sensitivity; explosive atmospheres
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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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MDPI and ACS Style

Sáenz de Inestrillas, Á.; Camarena, F.; Bou Cabo, M.; Barreiro, J.M.; Reig, A. Design and Performance of a Metal-Shielded Piezoelectric Sensor. Sensors 2017, 17, 1284.

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