A8.4 - Modelling and Characterization of Piezoelectric 1-3 Fiber Composites

Steinhausen, R.; Pientschke, Ch.; Kern, S.; Beige, H.

doi:10.5162/sensor11/a8.4

Cited by 4 publications

(4 citation statements)

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“…For the applications of high frequency ultrasound, crystalline or ceramic films can be used. Piezoelectric composite materials consist of an active piezoelectric component and a passive piezoelectric matrix (typically epoxy resin or other polymers) [27]. With this combination, they have the piezoelectric properties of ceramics as well as the low density and softness of polymers.…”

Section: Methodsmentioning

confidence: 99%

“…Piezoelectrics composites have high electromechanical coupling coefficients, low density, and, therefore, low acoustic impedance. In addition, these composites are highly elastic compared to the bulk ceramic materials [27].…”

Section: Methodsmentioning

confidence: 99%

“…Further effective properties of 1-3 composites in addition to methods of construction are explained at [27].…”

Section: Methodsmentioning

confidence: 99%

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Toward transcranial ultrasound tomography: design of a 456-element low profile conformal array

Smiley¹,

Howell²,

Clement³

et al. 2019

Biomed. Phys. Eng. Express

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We have been investigating a 'belt-type' conformal transducer array designed for transcranial brain imaging. In precursory simulation work it was estimated that an array consisting of approximately 500 channels would be sufficient to achieve two-dimensional brain imaging utilizing a tomographic approach valid on irregular boundaries [G T Clement 2014 Inverse Probl. 30 1-22], such as the human head. To achieve such an array in practice we describe here a transducer designed and constructed around an assembly of rigid 1-3 composite planar sub-arrays (500 kHz, 1-3 random-fiber, 20 mm×20 mm) consisting of 19 elements. Sub-arrays are bonded to custom-printed circuit boards wired to shielded ribbon cable. The full transducer is created by ultra violet (UV) bonding the electrodes to a flexible 3D-printed head band. Element performance is assessed by underwater scanned hydrophone characterization in the far-field. Measurements are then numerically backprojected to the transducer face to assess isolation. It is determined that elements function independently with little impact on the nearby elements. The maximum measured pressure amplitude crosstalk of the neighbouring elements to the active element is less than −14 dB, which making appropriate connections to the 1-3 composite tile was a significant consideration satisfies the later tomography imaging requirements. Results also show a maximum 3 dB decrease in the pressure amplitude as referenced to the maximum pressure amplitude of elements. Due to the limited number of channels on the data and control acquisition system (N=128), an expander was designed and fabricated using 4:1 multiplexers (MUXs) to cover all the required number of transducer elements for the imaging system. The electrical characterization of the expander was addressed in terms of noise and crosstalk. Results show crosstalk of about −58.7±2.9 dB for the MUXs. Average signal to noise ratio (SNR) decreased by about 0.05 dB after adding the expander. Noise levels remained almost the same after increasing the average detected signal power. Overall, the design and measured results are found to satisfy the key transducer requirements for a conformal array designed for transcranial diffraction tomography. This 'work in progress' will be combined with an optical registration technique to form a complete imaging device.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Toward transcranial ultrasound tomography: design of a 456-element low profile conformal array

Smiley¹,

Howell²,

Clement³

et al. 2019

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

show abstract

“…In addition, it provides good acoustic impedance matching to a medium like the human body (

1.5 MRalys) because the polymer structure is distributed to reduce the overall acoustic impedance from >30 to 4–25 MRayls [ 113 ]. Finally, the composite structure is more flexible than the bulk structure, which facilitates geometrical deformation of aperture with minimal damage to the ceramic [ 148 , 149 , 150 , 151 , 152 ]. Because of these advantages, composite structures have been used in various IVUS transducers.…”

Section: Ivus Transducersmentioning

confidence: 99%

Mechanically Rotating Intravascular Ultrasound (IVUS) Transducer: A Review

Sung

Chang

2021

Sensors

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Intravascular ultrasound (IVUS) is a valuable imaging modality for the diagnosis of atherosclerosis. It provides useful clinical information, such as lumen size, vessel wall thickness, and plaque composition, by providing a cross-sectional vascular image. For several decades, IVUS has made remarkable progress in improving the accuracy of diagnosing cardiovascular disease that remains the leading cause of death globally. As the quality of IVUS images mainly depends on the performance of the IVUS transducer, various IVUS transducers have been developed. Therefore, in this review, recently developed mechanically rotating IVUS transducers, especially ones exploiting piezoelectric ceramics or single crystals, are discussed. In addition, this review addresses the history and technical challenges in the development of IVUS transducers and the prospects of next-generation IVUS transducers.

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Mechanical and electromechanical properties of piezoelectric ceramic fibers drawn by the alginate gelation method

Mensur‐Alkoy

Kaya

Sarı

et al. 2019

Int J Applied Ceramic Tech

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Piezoelectric ceramic fibers are widely used in piezocomposite devices. The various methods that are used to draw ceramic fibers differ in the way the fiber form is obtained, which in return closely affects the density, uniformity and the properties of the fibers that are obtained at the end. In this study, the processing-property relationship in the piezoceramic fibers drawn using the alginate gelation method is investigated, with a focus on the mechanical and electrical properties of individual fibers.Fibers with a Weibull strength of 65.3 MPa, remanent polarization of 22 μC/cm 2 and a total bipolar field induced strain of 0.25% under an electric field of 2.5 kV/mm, piezoelectric coefficient of 300 pm/V and dielectric constant of 3323 were produced.1-3 piezocomposite devices prepared from these fibers had a 6 dB higher free-field voltage sensitivity and a 50% wider bandwidth compared to a solid disk transducer of the same dimensions. K E Y W O R D Sceramic matrix composites, electrical properties, fibers, piezoelectric materials/properties 1372 | MENSUR-ALKOY Et AL.

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A8.4 - Modelling and Characterization of Piezoelectric 1-3 Fiber Composites

Cited by 4 publications

References 0 publications

Toward transcranial ultrasound tomography: design of a 456-element low profile conformal array

Toward transcranial ultrasound tomography: design of a 456-element low profile conformal array

Mechanically Rotating Intravascular Ultrasound (IVUS) Transducer: A Review

Mechanical and electromechanical properties of piezoelectric ceramic fibers drawn by the alginate gelation method

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