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Title: Dual mode acoustic wave sensor for precise pressure reading
Authors: Mu, Xiaojing
Kropelnicki, Piotr
Wang, Yong
Randles, Andrew Benson
Chai, Kevin Tshun Chuan
Gu, Yuan Dong
Cai, H.
Keywords: Surface acoustic waves
Acoustic sensing
High pressure
Pressure measurement
Sound pressure
Issue Date: 2014
Source: Mu, X., Kropelnicki, P., Wang, Y., Randles, A. B., Chai, K. T. C., Cai, H.,et al. (2014). Dual mode acoustic wave sensor for precise pressure reading. Applied Physics Letters, 105(11), 113507-.
Series/Report no.: Applied Physics Letters
Abstract: In this letter, a Microelectromechanical system acoustic wave sensor, which has a dual mode (lateral field exited Lamb wave mode and surface acoustic wave (SAW) mode) behavior, is presented for precious pressure change read out. Comb-like interdigital structured electrodes on top of piezoelectric material aluminium nitride (AlN) are used to generate the wave modes. The sensor membrane consists of single crystalline silicon formed by backside-etching of the bulk material of a silicon on insulator wafer having variable device thickness layer (5 μm–50 μm). With this principle, a pressure sensor has been fabricated and mounted on a pressure test package with pressure applied to the backside of the membrane within a range of 0 psi to 300 psi. The temperature coefficient of frequency was experimentally measured in the temperature range of −50 °C to 300 °C. This idea demonstrates a piezoelectric based sensor having two modes SAW/Lamb wave for direct physical parameter—pressure readout and temperature cancellation which can operate in harsh environment such as oil and gas exploration, automobile and aeronautic applications using the dual mode behavior of the sensor and differential readout at the same time.
ISSN: 0003-6951
DOI: 10.1063/1.4896025
Schools: School of Electrical and Electronic Engineering 
Rights: © 2014 American Institute of Physics (AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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