Porous piezoelectric ceramic hydrophone

Marselli, S.; Pavia, V.; Galassi, Carmen; Roncari, E.; Craciun, F.; Guidarelli, G.

doi:10.1121/1.427091

Cited by 58 publications

(56 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another important application is underwater acoustics for which hydrostatic properties of the porous piezoelectric material are the key parameters [39][40][41][42]. An active transducer sensitivity can be characterised by the hydrostatic strain coefficient d h defined by :…”

Section: Modellingmentioning

confidence: 99%

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Levassort

Holc

Ringgaard³

et al. 2007

J Electroceram

View full text Add to dashboard Cite

Porous ceramics are of interest for ultrasonic transducer applications. Porosity allows to decrease acoustical impedance, thus improving transfer of acoustical energy to water or biological tissues. For underwater applications, the d h g h figure of merit can also be improved as compared to dense materials. In the case of high frequency transducers, namely for high resolution medical imaging, thick film technology can be used. The active films are generally porous and this porosity must be controlled. An unpoled porous PZT substrate is also shown to be an interesting solution since it can be used in a screen-printing process and as a backing for the transducer. This paper describes the fabrication process to obtain such materials, presents microstructure analysis as well as functional properties of materials. Modelling is also performed and results are compared to measurements. Finally, transducer issues are addressed through modelling and design of several configurations. The key parameters are identified and their effect on transducer performance is discussed. A comparison with dense materials is performed and results are discussed to highlight in which cases porous piezoceramics can improve transducer performance, and improvements are quantified.

show abstract

Section: Modellingmentioning

confidence: 99%

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Levassort

Holc

Ringgaard³

et al. 2007

J Electroceram

View full text Add to dashboard Cite

show abstract

“…It is well-known that the porous piezoceramics have enhanced properties with respect to dense ceramics for applications like some types of low frequency hydrophones and sensors, due to their better hydrostatic figures of merit (d h g h ) [10][11][12]. However, the porous ceramics characteristics, namely, the low mechanical quality factors and electromechanical coupling coefficients, limit the application of the 1987 IEEE [2] and CENELEC [3] Standard measurement methods in their characterization.…”

Section: Introductionmentioning

confidence: 99%

Key issues in the characterization of porous PZT based ceramics with morphotropic phase boundary composition

Pardo

García

Brebøl³

et al. 2007

J Electroceram

View full text Add to dashboard Cite

An iterative automatic method is used to calculate, from impedance measurements at resonance in three sample shapes and four modes of resonance, all the directly obtained coefficients that are needed to determine the ten elastic, dielectric and piezoelectric complex coefficients of the characteristic matrix of a 6 mm symmetry ferro-piezoelectric ceramic for a controlled porosity material. A soft PZT ceramic with a Morphotropic Phase Boundary (MPB) composition was studied. Samples with homogeneously distributed close porosity were prepared and tested. A fugitive phase was added to the perovskite type structure precursor powder to produce the porous materials and the samples were consolidated by die pressing. Shear coefficients are here obtained using an alternative geometry to the Standards shear sample, that was proved to be dynamically clamped at resonance. Comparison of these shear results and those obtained with the geometry of the Standards is here discussed and the advantages for the shear characterization of porous ceramics derived from the use of this new geometry are presented.

show abstract

“…The behaviour of coupling or decoupling of the algebraic system remains the same in pure piezoelectric and PPM cases. The mutual angles θ 13 , θ 14 and θ 34 , corresponding to the pure piezoelectric case, have been computed for all the above-mentioned crystal classes and planes of propagation. Unlike the PPMs all three waves are found to be mutually orthogonal in all the crystal classes and planes of propagation (figure 14).…”

Section: Wave Propagation In the X 1 -X 2 Planementioning

confidence: 99%

Decoupling of plane waves in porous piezoelectric materials

Vashishth

Gupta

2014

Proc. R. Soc. A.

View full text Add to dashboard Cite

In this paper, the analytical and numerical studies of two-dimensional wave propagation in porous piezoelectric materials (PPMs) are carried out. The decoupling of waves, in such materials for various crystal classes, is studied analytically for different coordinate planes. It is found that, for wave propagation in a plane, the system is decoupled in some crystal classes, whereas it remains coupled in other crystal classes. It is established that the decoupled pure-shear wave, propagating in a PPM, can be stiffened or unstiffened with piezoelectric effects even if the PPM belongs to the same symmetry group but has a different crystal class. The skewing angles and mutual angles between the polarization directions of different waves are also computed numerically.

show abstract

Porous piezoelectric ceramic hydrophone

Cited by 58 publications

References 20 publications

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Fabrication, modelling and use of porous ceramics for ultrasonic transducer applications

Key issues in the characterization of porous PZT based ceramics with morphotropic phase boundary composition

Decoupling of plane waves in porous piezoelectric materials

Contact Info

Product

Resources

About