Ferroelectret non-contact ultrasonic transducers

Bovtun, V.; Döring, J.; Bartusch, Jürgen; Beck, Uve; Erhard, Anton; Yakymenko, Yuriy

doi:10.1007/s00339-007-4060-3

Cited by 45 publications

(38 citation statements)

References 11 publications

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“…Due to its high piezoelectric voltage constant g 33 [7], ferroelectret has already been used extensively in sensor applications, such as blood pressure pulse transducer [8], touch sensor [9], ultrasonic transducer [10], prosthetic skin [11], and accelerometer [12]. Among the ferroelectret materials that have been developed, cellular polypropylene (PP) is one of the most researched [2][3][4][5][6], and being one of the first commercialized ferroelectrets [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting study on single and multilayer ferroelectret foams under compressive force

Luo

Zhu

Shi

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Cellular polypropylene (PP) ferroelectret is a thin and flexible cellular polymer foam that generates electrical power under mechanical force. This work investigates single and multilayer ferroelectret PP foams and their potential to supply energy for human-bodyworn sensors. Human foot-fall is emulated using an electrodynamic instrument, allowing applied compressive force and momentum to be correlated with energy output. Peak power, output pulse duration, and energy per strike is derived experimentally as a function of force and momentum, and shown to be a strong function of external load resistance, thus providing a clear maximum energy point. The possibility of increasing pulse time and reducing voltage to CMOS compatible levels at some expense of peak power is shown. To further increase the output power, multilayer ferroelectret is presented. The synchronized power generation of each layer is studied and illustrated using simulation, and results are supported by experiments. Finally, the energy output of single-layer and multi-layer ferroelectrets are compared by charging a capacitor via a rectifier. A ten-layer ferroelectret is shown to have charging ability 29.1 times better than that of the single-layer ferroelectret. It demonstrates energy output that is capable of powering the start-up and transmission of a typical low-power wireless sensor chipset.

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Section: Introductionmentioning

confidence: 99%

Energy harvesting study on single and multilayer ferroelectret foams under compressive force

Luo

Zhu

Shi

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…Contact rings were used to maintain the electrical circuit isolated from the water but close as possible to the piezoelectret. Since piezoelectrets normally presents an acoustic impedance (Z a ) of 0.03 MRayl, due to its high porosity [14], a backing rod made of nylon with an air cavity (Z air = 0.00042 MRayl) was implemented to improve acoustic impedance match and to provide electrical insulation.…”

Section: Bmentioning

confidence: 99%

“…Regarding ultrasonic applications it has been shown that cellular-foamed piezoelectrets are an interesting material for air couple transducers, such as, microphones due to its low acoustic impedance, flat response in the kHz range [10] and sensing arrays [11,12] or even be suitable for some underwater applications as hydrophones [13].…”

Section: Introductionmentioning

confidence: 99%

Multi-layer piezoelectret hydrophone for ultrasonic applications

Medeiros

Basso

Altafim³

2012

2012 IEEE International Ultrasonics Symposium

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Thin porous flexible films with large piezoelectric effects are now known as ferroelectrets or piezoelectrets. Recent developed techniques for fusing fluoropolymer films with wellcontrolled cavities have promoted a new class of this material, thermally more stable. In this work, we investigate the underwater behavior of a multi-layer piezoelectret with open tubular channels. For this propose an electrically shield and waterproof aluminum housing was developed. The piezoelectret was tested and results were compared with those obtained from a commercially available hydrophone.

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“…Examples for proposed FOMs are d, g, and k separately, the products d Â g and d Â Q, the ratio k 4 /Z 2 as well as combinations of hydrostatic piezoelectric constants. [1][2][3][4][5][6] The choice mostly depends upon the application for which the piezoelectric materials are being used.…”

mentioning

confidence: 99%

“…4,5 Such a definition is useful in some applications but in other situations other definitions may be preferable. An example is an experiment where the signal-to-noise-ratio (SNR) at the output of the receiver electronics is of importance rather than the amount of output power.…”

mentioning

confidence: 99%