A theoretical analysis of a piezoelectric ultrasound device with an active matching layer

Mulholland, Anthony J.; O'Leary, Richard; Ramadas, Nishal; Parr, Agnes; Troge, Alexandre; Pethrick, Richard A.; Hayward, G.

doi:10.1016/j.ultras.2007.08.002

Cited by 17 publications

(5 citation statements)

References 8 publications

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“…The bandwidth of the device is often used as the cut-off frequency since this gives the range of frequencies over which the sensor operates efficiently. Previous research has assessed the effectiveness of a transducer by determining its gain bandwidth product [28,29]. This figure of merit is beneficial as it can provide an estimate for the range of frequencies around a particular centre frequency that attains a particular amplitude [30].…”

Section: Resultsmentioning

confidence: 99%

A Mathematical Model of a Novel 3D Fractal-Inspired Piezoelectric Ultrasonic Transducer

Walker

Roach

2016

Sensors

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Piezoelectric ultrasonic transducers have the potential to operate as both a sensor and as an actuator of ultrasonic waves. Currently, manufactured transducers operate effectively over narrow bandwidths as a result of their regular structures which incorporate a single length scale. To increase the operational bandwidth of these devices, consideration has been given in the literature to the implementation of designs which contain a range of length scales. In this paper, a mathematical model of a novel Sierpinski tetrix fractal-inspired transducer for sensor applications is presented. To accompany the growing body of research based on fractal-inspired transducers, this paper offers the first sensor design based on a three-dimensional fractal. The three-dimensional model reduces to an effective one-dimensional model by allowing for a number of assumptions of the propagating wave in the fractal lattice. The reception sensitivity of the sensor is investigated. Comparisons of reception force response (RFR) are performed between this novel design along with a previously investigated Sierpinski gasket-inspired device and standard Euclidean design. The results indicate that the proposed device surpasses traditional design sensors.

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Section: Resultsmentioning

confidence: 99%

A Mathematical Model of a Novel 3D Fractal-Inspired Piezoelectric Ultrasonic Transducer

Walker

Roach

2016

Sensors

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“…As ultrasonic propagation is sensitive to the inner structure of the fluid, changes in the mechanical stiffness and density in one direction will be accompanied by changes in the ultrasonic velocity and attenuation along this direction [33][34][35]. Due to attenuation mechanisms, acoustic filters or active matching layers associated to changes in the velocity have been studied using ultrasound [24,36]. Sedimentation processes, thermal behavior, hysteretic effects, yielding processes and evolution of the inner microstructure of MR fluids have been studied with these techniques [25,37,38].…”

Section: Introductionmentioning

confidence: 99%

Study of the effect of particle volume fraction on the microstructure of magnetorheological fluids using ultrasound: Transition between the strong-link to the weak-link regimes

et al. 2015

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“…In this case, one of these active layers is also used as matching layer. In this sense, Mulholland et al [14] theoretically studied magnetically active materials in the matching layer so that, by applying an external magnetic field, the resonant behaviour of the device can be dynamically altered.…”

Section: Introductionmentioning

confidence: 99%

Air-Coupled Piezoelectric Transducers with Active Polypropylene Foam Matching Layers

Álvarez-Arenas

2013

Sensors

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This work presents the design, construction and characterization of air-coupled piezoelectric transducers using 1–3 connectivity piezocomposite disks with a stack of matching layers being the outer one an active quarter wavelength layer made of polypropylene foam ferroelectret film. This kind of material has shown a stable piezoelectric response together with a very low acoustic impedance (<0.1 MRayl). These features make them a suitable candidate for the dual use or function proposed here: impedance matching layer and active material for air-coupled transduction. The transducer centre frequency is determined by the λ/4 resonance of the polypropylene foam ferroelectret film (0.35 MHz), then, the rest of the transducer components (piezocomposite disk and passive intermediate matching layers) are all tuned to this frequency. The transducer has been tested in several working modes including pulse-echo and pitch-catch as well as wide and narrow band excitation. The performance of the proposed novel transducer is compared with that of a conventional air-coupled transducers operating in a similar frequency range.

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A theoretical analysis of a piezoelectric ultrasound device with an active matching layer

Cited by 17 publications

References 8 publications

A Mathematical Model of a Novel 3D Fractal-Inspired Piezoelectric Ultrasonic Transducer

A Mathematical Model of a Novel 3D Fractal-Inspired Piezoelectric Ultrasonic Transducer

Study of the effect of particle volume fraction on the microstructure of magnetorheological fluids using ultrasound: Transition between the strong-link to the weak-link regimes

Air-Coupled Piezoelectric Transducers with Active Polypropylene Foam Matching Layers

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