Polymer-metal front matching layers for ultrasonic transducers with arbitary impedance conversion

Toda, Minoru; Thompson, Mitchell

doi:10.1109/ultsym.2010.5935443

Cited by 4 publications

(6 citation statements)

References 10 publications

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“…These composites are suitable to bio medical applications. Unlike piezo ceramics and crystals, piezoelectric polymers have low acoustic impedance which makes them favorable for sensing in the environments like water, human tissue and other organic materials [ 4 ]. Paper has also been a unique choice in realizing some appealing applications as it is best suited for environmentally friendly and biocompatible products.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Polymer and Paper Substrates: A Review

Sappati

Bhadra

2018

Sensors

236

140

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Polymers and papers, which exhibit piezoelectricity, find a wide range of applications in the industry. Ever since the discovery of PVDF, piezo polymers and papers have been widely used for sensor and actuator design. The direct piezoelectric effect has been used for sensor design, whereas the inverse piezoelectric effect has been applied for actuator design. Piezo polymers and papers have the advantages of mechanical flexibility, lower fabrication cost and faster processing over commonly used piezoelectric materials, such as PZT, BaTiO3. In addition, many polymer and paper materials are considered biocompatible and can be used in bio applications. In the last 20 years, heterostructural materials, such as polymer composites and hybrid paper, have received a lot of attention since they combine the flexibility of polymer or paper, and excellent pyroelectric and piezoelectric properties of ceramics. This paper gives an overview of piezoelectric polymers and papers based on their operating principle. Main categories of piezoelectric polymers and papers are discussed with a focus on their materials and fabrication techniques. Applications of piezoelectric polymers and papers in different areas are also presented.

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Section: Introductionmentioning

confidence: 99%

Piezoelectric Polymer and Paper Substrates: A Review

Sappati

Bhadra

2018

Sensors

236

140

View full text Add to dashboard Cite

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“…The spring-mass matching layer model was developed under the assumption that the polymer layer behaves as a massless spring while the metal is an incompressible mass [3]. The mechanical impedance of the polymer layer can be chosen by tuning its thickness, and a 90° phase is introduced by adding a mass layer to make the system resonate at the desired frequency [5].…”

Section: A Spring-mass Matching Layersmentioning

confidence: 99%

“…"cf" is a correction factor with a value of 0.4, which accounts for the mass added by the thin spring layer to the resonating system. An extended explanation and derivation of the formulas can be found in [3] and [4].…”

Section: A Spring-mass Matching Layersmentioning

confidence: 99%

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Novel spring-mass matching layer fabrication

Gorostiaga

Wapler

Wallrabe

2015

2015 IEEE International Ultrasonics Symposium (IUS)

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Spring-mass matching layers consisting of a thin polymer layer ("massless spring") covered by a metal layer ("incompressible mass") can be designed to achieve any desired acoustic impedance and act as an equivalent λ/4 matching layer.In this paper, we present a fabrication process of these matchinglayers based on spin-coated PDMS as spring layer and stainless steel commercial foils as mass layer.

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“…However, they have shown a relatively weak piezoelectric coefficient d 33 . 3 Therefore, the need for polymer-based materials with good piezoelectric properties led to the development of piezoelectric cellular polymers that have shown interesting dielectric and mechanical properties, [4][5][6][7] owing to the internal voids that serve as artificial dipoles instead of being present in the molecular structure. Significant similarities between ferroelectric materials and cellular space charge electrets have been highlighted.…”

Section: Introductionmentioning

confidence: 99%

Theoretical modeling of longitudinal piezoelectric characteristic for cellular polymers

et al. 2021

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Efficient energy harvesting is a difficult challenge that consists in the development of systems allowing charging autonomous and low-power devices. In addition to traditional piezoelectric polymers, mono-crystals, and ceramics, cellular electrets offer consistent solutions by converting wasted vibration energy from the environment to usable electrical energy. This paper presents an electromechanical model to study the energy harvesting capability of cellular polymers. The theoretical study models the response of these materials to investigate the effect of different parameters on the piezoelectric coefficient d33, particularly. The model considers the percentage of porosity, surface charge density in each polymer–gas surface, the properties of the polymer matrix and the gas encapsulated in the pores, and the Young’s modulus of the porous film. For poly(ethylene-co-vinyl acetate), the results showed that the piezoelectric performance of the film declines with the increase of the film thickness. However, the variation of the d33 as a function of the percentage of porosity is exponential and can achieve 4.24 pC/N for a porosity of 80%. Compared to a previously published experiment, the theoretical results have proven a good agreement with only 3.3% error.

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Polymer-metal front matching layers for ultrasonic transducers with arbitary impedance conversion

Cited by 4 publications

References 10 publications

Piezoelectric Polymer and Paper Substrates: A Review

Piezoelectric Polymer and Paper Substrates: A Review

Novel spring-mass matching layer fabrication

Theoretical modeling of longitudinal piezoelectric characteristic for cellular polymers

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