Nonlinear electromechanical response of the ferroelectret ultrasonic transducers

Döring, J.; Bovtun, V.; Bartusch, Jürgen; Erhard, Anton; Kreutzbruck, Marc; Yakymenko, Yuriy

doi:10.1007/s00339-010-5752-7

Cited by 21 publications

(25 citation statements)

References 12 publications

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“…A number of papers about the use of ferroelectrets as transmitters and receivers of airborne ultrasound and about the use of ferroelectret transducers in transmit-receive and in Downloaded by [Monash University Library] at 12:05 04 December 2014 pulse-echo systems have recently appeared in the literature [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. These papers document the large progress that has been achieved in this field.…”

Section: Introductionmentioning

confidence: 97%

DC-Biased Piezoelectret Film Transducers for Airborne Ultrasound

Hillenbrand¹,

Sessler

2014

Ferroelectrics

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Ultrasonic senders with DC-biased piezoelectret films were built and characterized. The generated sound pressure of the transducers is inversely proportional to the distance from the transducer and proportional to transducer size, AC-voltage, square of the frequency, and effective d 33 -coefficient of the films. With polypropylene films and DCvoltages of 1000 V, effective d 33 -coefficients of more than 750 pC/N are obtained. For an applied signal AC-voltage of 46 V rms , a transducer area of 1.8 cm 2 , and a distance of 60 mm, sound pressures exceeding 10 Pa were measured in the frequency range above 100 kHz. With stacks of 2 and 3 piezoelectret film layers, effective d 33 -coefficients up to 1500 pC/N and sound pressures of about 20 and 40 Pa, respectively, could be obtained at frequencies between 60 and 120 kHz. This represents, for otherwise equal parameters, an increase by about a factor of four compared to previous piezoelectret transducers.

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Section: Introductionmentioning

confidence: 97%

DC-Biased Piezoelectret Film Transducers for Airborne Ultrasound

Hillenbrand¹,

Sessler

2014

Ferroelectrics

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“…11 The same experimental set-up is used for extended investigations. Short rectangular electric pulses of both polarities with amplitude V 1 from 23500 V to z3500 V and a length of 1 ms were applied to the FE transmitter with a rate of 15 pulses per second.…”

Section: Non-linear Electromechanical Response Of Fe Transmittermentioning

confidence: 99%

“…The authors describe these transmission characteristics by promotion and competition of the piezoelectric and electrostriction contributions following the simple model used in Ref. 11. Thickness change of the transmitter FE film Dh 1 due to application of the exciting voltage V 1 consists of the piezoelectric Dh 1d and electrostriction Dh 1a contributions (see Fig.…”

Section: Non-linear Electromechanical Response Of Fe Transmittermentioning

confidence: 99%

Enhanced electromechanical response of ferroelectret ultrasonic transducers under high voltage excitation

Bovtun

Döring

Bartusch

et al. 2013

Advances in Applied Ceramics

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Polypropylene based ferroelectret films exhibit a strong electromechanical activity and provide a promising solution for the air coupled ultrasonic (ACUS) transducers. Ultrasonic transmission between two air coupled ferroelectret transducers in dependence on the amplitude and polarity of the high voltage exciting pulse revealed a strongly non-linear electromechanical response of the ferroelectret transmitter which provides an increase in the transmitter efficiency. The authors present a simple model describing both promotion and competition of the piezoelectric and electrostriction contributions, as well as increase in the transducer constant under high voltage excitation. Enlargement of the inverse transducer constant of the polypropylene ferroelectret film by a factor of 4 was demonstrated. The non-linear properties of the polypropylene ferroelectrets result in a strong increase in their ACUS figure of merit under the high voltage excitation, which exceeds the results of their technological optimisation. Consequently, enhancement of the ACUS system transmission by 12 dB and signal to noise ratio by 32 dB was achieved.

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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%