Incremental "model-build-test" validation exercise for a 1-D biomedical ultrasonic imaging array

Powell, David J.; Wojcik, G.; Desilets, C.S.; Gururaja, T.R.; Guggenberger, Konstanze; Sherrit, Stewart; Mukherjee, B. K.

doi:10.1109/ultsym.1997.663316

Cited by 24 publications

(18 citation statements)

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“…The resonance measurement technique involves observing the resonant and antiresonant frequencies of crystal samples of various geometries to derive the material constants directly related to the particular mode of vibration of each sample. (10,24,25) For the generation of clear resonance modes without mode coupling, the crystal resonators must have specific geometries suitable for particular modes of vibration. To identify the eleven independent material constants of the PMN-28%PT single crystals, six different resonators have been analyzed in this work: length extensional (LE), thickness extensional (TE), thickness shear (TS), and length thickness extensional (LTE) resonators, and two variations of the LTE resonators, XYt45° and ZXt45°.…”

Section: Resonator Measurementmentioning

confidence: 99%

“…To identify the eleven independent material constants of the PMN-28%PT single crystals, six different resonators have been analyzed in this work: length extensional (LE), thickness extensional (TE), thickness shear (TS), and length thickness extensional (LTE) resonators, and two variations of the LTE resonators, XYt45° and ZXt45°. (25,26) Each resonator was thus named to represent its principal resonant mode, adopting the definition and nomenclature given in the IEEE Standard on Piezoelectricity. (25,26) In the notation for the XYt45° resonator, the first character X means that the direction of the resonator thickness is along the crystal X axis, the second character Y means that the direction of the resonator length is along the crystal Y axis, and t45° means that the resonator is rotated around its thickness direction t by 45°.…”

Section: Resonator Measurementmentioning

confidence: 99%

“…(25,26) Each resonator was thus named to represent its principal resonant mode, adopting the definition and nomenclature given in the IEEE Standard on Piezoelectricity. (25,26) In the notation for the XYt45° resonator, the first character X means that the direction of the resonator thickness is along the crystal X axis, the second character Y means that the direction of the resonator length is along the crystal Y axis, and t45° means that the resonator is rotated around its thickness direction t by 45°. (25,26) The same notations are also applied to the ZXt45° model.…”

Section: Resonator Measurementmentioning

confidence: 99%

“…(25,26) In the notation for the XYt45° resonator, the first character X means that the direction of the resonator thickness is along the crystal X axis, the second character Y means that the direction of the resonator length is along the crystal Y axis, and t45° means that the resonator is rotated around its thickness direction t by 45°. (25,26) The same notations are also applied to the ZXt45° model. The specific geometry and properties of each resonator are described below and in Figs.…”

Section: Resonator Measurementmentioning

confidence: 99%

“…For clear observation of the TE mode, the dimensions of the plate should satisfy the conditions w > 10t and l > 10t. (24,25) The figure shows both the initial shape (dotted line) and deformed shape of the resonator. The thick arrow inside the plate denotes the polarization direction of the resonator.…”

Section: Thickness Extensional (Te)-mode Resonatormentioning

confidence: 99%

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Evaluation of All the Material Constants of PMN-28%PT Piezoelectric Single Crystals for Acoustic Transducers

2013

Sensors and Materials

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In this study, all the elastic, piezoelectric, and dielectric constants of lead magnesium niobate-28%lead titanate (PMN-28%PT) single crystals have been determined by the resonance method. In comparison with other PMN-PT crystal compositions characterized so far, PMN-28%PT crystals offer better structural reliability and easy growth controllability. The PMN-28%PT single crystals were grown by the Bridgman method to have a tetragonal symmetry of 4mm, and thus have eleven independent material constants: six elastic constants, two dielectric constants and three piezoelectric constants. The eleven constants were determined through measurement and analysis of only the impedance spectra of six different types of PMN-PT resonators: length extensional (LE), thickness extensional (TE), thickness shear (TS)-mode, and length thickness extensional (LTE) resonators, and two variations of the LTE resonators, XYt45º and ZXt45º. The characterization method in this work yields all the material constants of PMN-28%PT crystals through consistent and systematic resonance measurements. The validity of the characterization method and accuracy of the determined material constants are demonstrated through comparison of the experimental impedance spectra with numerically obtained impedance spectra of the resonators having the derived constants.

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Section: Resonator Measurementmentioning

confidence: 99%

Section: Resonator Measurementmentioning

confidence: 99%