Saw-Based Radio Sensor and Communication Techniques

Seifert, F.; Weigel, Robert

doi:10.1109/euma.1997.337980

Cited by 11 publications

(5 citation statements)

References 44 publications

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“…High temperature Surface Acoustic Wave (SAW) sensors are based on detecting the change in phase velocity of the surface acoustic wave caused by temperatures [10]. The velocity change can be monitored by measuring the frequency or phase characteristics of the sensor and then can be correlated to the corresponding temperature quantity being measured.…”

Section: Introductionmentioning

confidence: 99%

A Passive Wireless Temperature Sensor for Harsh Environment Applications

Wang

Jia

Chen

et al. 2008

Sensors

110

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High temperature sensors capable of operating in harsh environments are needed in order to prevent disasters caused by structural or system functional failures due to increasing temperatures. Most existing temperature sensors do not satisfy the needs because they require either physical contact or a battery power supply for signal communication, and furthermore, neither of them can withstand high temperatures nor rotating applications. This paper presents a novel passive wireless temperature sensor, suitable for working in harsh environments for high temperature rotating component monitoring. A completely passive LC resonant telemetry scheme, relying on a frequency variation output, which has been applied successfully in pressure, humidity and chemical measurement, is integrated with a unique high-k temperature sensitive ceramic material, in order to measure the temperatures without contacts, active elements, or power supplies within the sensor. In this paper, the high temperature sensor design and performance analysis are conducted based on mechanical and electrical modeling, in order to maximize the sensing distance, the Q factor and the sensitivity. In the end, the sensor prototype is fabricated and calibrated successfully up to 235°C, so that the concept of temperature sensing through passive wireless communication is proved.

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Section: Introductionmentioning

confidence: 99%

A Passive Wireless Temperature Sensor for Harsh Environment Applications

Wang

Jia

Chen

et al. 2008

Sensors

110

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“…This model for the dynamics of membranes has been introduced by Brochard and Lennon [33] for two membranes; their analysis has been extended to an infinite stack of membranes by Messager et al [12] and more rigorously by Seifert [34] (compare also Refs. [35,36]).…”

Section: The Model 21 Stacks Of Bilayers In Watermentioning

confidence: 98%

Dynamics of the swollen lamellar phase

Schilling

Theissen

Gompper

2001

The European Physical Journal E

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We investigate the dynamical behavior of lamellar phases in ternary amphiphilic systems of water, oil and amphiphile. The interaction between the amphiphilic monolayers is described by the steric interaction due to thermal fluctuations for uncharged, and by electrostatic interactions for charged systems. The dynamics of the system is determined by the hydrodynamics of the fluid layers. The basic parameters of our model are the viscosities of the two solvents, the average thicknesses of the oil and water layers, and the bending rigidity. The model allows to consider different monolayer interactions across the oil and water layers. Relaxation rates are calculated for arbitrary wave vectors parallel and perpendicular to the average monolayer plane. We find that there is a quite complex crossover behavior from a q 2 law for small parallel wave vectors to a q 3 law for large q . We discuss the relevance of our result for the interpretation of dynamic light-scattering and neutron-spin-echo experiments for these systems. PACS. 47.55.-t Nonhomogeneous flows -68.10.-m Fluid surfaces and fluid-fluid interfaces -82.70.-y Disperse systems

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“…The constitutive equations of piezoelectricity read as [4] c E S-e'E eS+£ s E. (1) (2) Γ tensor of mechanical stress 5 tensor of mechanical strain £ vector of electric field D vector of electric displacement f tensor of mechanical coefficients at constant electric field e tensor of piezoelectric coefficients ε 5 permittivity tensor at constant mechanical strain In linear theory of elasticity the tensor of mechanical strains S can be written as…”

Section: Fundamental Equationsmentioning

confidence: 99%

“…The design of such SAW devices is based on (i) signal theory, (ii) network theory and (iii) field theory [1]. Impulse response modeling allows for a first order design since the IDT-time-dependent impulse response h(t) is directly related to the overlap and spacing of the electrodes as a function of position, with the time-scale related to the position-scale by the propagation velocity of the SAW.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of complex structures a transverse velocity as equivalent circuit modeling, matrix manipulation techniques such as P-matrix formalisms, or coupling-of-modes (COM) techniques [1]. In the case of complex structures a transverse velocity as equivalent circuit modeling, matrix manipulation techniques such as P-matrix formalisms, or coupling-of-modes (COM) techniques [1].…”

Section: Introductionmentioning

confidence: 99%

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Accurate and Efficient Modeling of SAW Structures

Hofer¹,

Jungwirth²,

Lerch³

et al. 2001

Frequenz

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By way of two examples it is demonstrated that basic field theory concepts may be successfully applied to model anisotropic microacoustic phenomena which occur in the design of surface acoustic wave (SAW) devices. A new 3D finite element method (FEM) scheme incorporating multigrid (MG) algorithms is presented which allows for the first time a complete and accurate simulation of the propagation of surface acoustic waves in 3D. On the other hand, the feasibility of a new scalar 2D wave theory method called profile propagation method (PPM) is demonstrated and experimentally verified which enables a very efficient simulation of SAW phenomena. Both methods compromise accuracy for efficiency on a specific level of abstraction. Therefore, both techniques are indispensable for the design of complete SAW devices which usually is done employing network-theory methods. ÜbersichtAnhand zweier Beispiele wird die erfolgreiche Anwendung neuer numerischer Verfahren zur Modellierung mikroakustischer Phänomene demonstriert, welche beim Design von Oberflächenwellenbauelementen (OFW-Bauelementen) auftreten. Mittels einer 3D-Rnite-Elemente-Methode (FEM), in die ein schneller, iterativer Multigrid-Löser (MG-Loser) integriert wurde, war es erstmals möglich, die Ausbreitung von Oberflächenwellen unter Berücksichtigung aller Randeffekte zu berechnen. Des weiteren wird auf der Basis der Wellentheorie eine effiziente, zweidimensionale OFW-Designmethode namens Profile-Propagation-Method (PPM) vorgestellt. Diese ermöglicht ebenfalls eine effiziente Berechnung der Effekte, welche bei der Ausbreitung von Oberflächenwellen wesentlich sind. Beide Methoden legen den notwendigen Kompromiß zwischen Schärfe der Beschreibung einerseits und Recheneffizienz andererseits auf einer spezifischen, dem jeweiligen Problem angepaßten Stufe fest. Beide Methoden sind für den Entwurf kompletter OFW-Bauelemente unverzichtbar.Für die Dokumentation OFW-Bauteile / Modellierung / Finite-Elemente-Methode / Multigrid-Methode / Profile-Propagation-Methode

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Saw-Based Radio Sensor and Communication Techniques

Cited by 11 publications

References 44 publications

A Passive Wireless Temperature Sensor for Harsh Environment Applications

A Passive Wireless Temperature Sensor for Harsh Environment Applications

Dynamics of the swollen lamellar phase

Accurate and Efficient Modeling of SAW Structures

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