The Design of Optimum Lumped Broadband Equalizers for Ultrasonic Transducers

Andersen, J.; Wilkins, L.

doi:10.1109/ultsym.1977.196871

Cited by 14 publications

(6 citation statements)

References 5 publications

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“…A number of hardware techniques have been developed towards achieving a flat, broadband frequency response, using matching networks (Schmerr, 2006;Youla, 1964). The load is usually modeled as a resistor and capacitor (Reeder, 1972) or as a simple four-element circuit (Anderson, 1979). The problem with this approach is that, typically, the 4 www.intechopen.com frequency responses of piezoelectric elements have resonant characteristics, which are difficult to accurately model using the passive component matching networks normally used.…”

Section: Introductionmentioning

confidence: 99%

“…The problem with this approach is that, typically, the 4 www.intechopen.com frequency responses of piezoelectric elements have resonant characteristics, which are difficult to accurately model using the passive component matching networks normally used. In most cases, improved results can be obtained if the network suggested by one of the techniques listed in (Schmerr, 2006;Youla, 1964;Reeder, 1972;Anderson, 1979) is used as a starting point for the hardware optimization approach, which in turn accounts for frequency dependent radiation in the equivalent circuits of the matching networks.…”

Section: Introductionmentioning

confidence: 99%

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Bandwidth Enhancement: Correcting Magnitude and Phase Distortion in Wideband Piezoelectric Transducer Systems

Assous¹,

Rees²,

Lovell³

et al. 2011

Advances in Piezoelectric Transducers

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bandwidth Enhancement: Correcting Magnitude and Phase Distortion in Wideband Piezoelectric Transducer Systems

Assous¹,

Rees²,

Lovell³

et al. 2011

Advances in Piezoelectric Transducers

View full text Add to dashboard Cite

“…A number of hardware techniques have been developed towards achieving a flat, broadband frequency response, using matching networks (Schmerr, 2006;Youla, 1964). The load is usually modeled as a resistor and capacitor (Reeder, 1972) or as a simple four-element circuit (Anderson, 1979). The problem with this approach is that, typically, the frequency responses of piezoelectric elements have resonant characteristics, which are difficult to accurately model using the passive component matching networks normally used.…”

Section: Introductionmentioning

confidence: 99%

Advances in Piezoelectric Transducers

Ebrahimi¹

2011

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Since 2002, he has been working at the "Smart Materials and Structures Lab" Research Center of the Faculty of Mechanical Engineering at the University of Tehran, where he is a researcher of smart functionally graded materials and structures. He is involved in several international journals as editor and reviewer. He serves on the editorial board of "Far East Journal of Mechanical Engineering and Physics". He is the author of books "Smart Functionally Graded Plates" and "Progress in Analysis of Functionally Graded Structures", Nova Science Publishers, NY. He also served as the editor of the book "Advances in Vibration Analysis Research", InTech -Open Access Publisher, Croatia. His research interests focus on areas of smart materials and structures, plate and shell theory, vibration analysis of continuous systems, composite materials and structures, functionally graded materials and structures, finite element analysis and fracture mechanics and he has published several researches in these fields. His research in these areas has been presented at international conferences and appeared in academic journals such as "Journal of Mechanical Science and Technology", "Smart Materials and Structures", "European Journal of Mechanics" and "Archive of Applied Mechanics and Thin Walled Structures". Farzad has also strong collaboration with Iranian industries on gas and oil projects, as well as serves as ad-hoc referee in several top academic journals.

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“…A number of hardware techniques have been developed to design flat broadband frequency response matching networks [6][7][8] for acoustic transducers. The load is usually modelled as a resistor and capacitor [9] or as a simple four-element circuit [10]. The problem with this approach is that, typically, the frequency responses of piezoelectric elements have resonant characteristics, which are difficult to accurately mimic using fixed component networks.…”

Section: Introductionmentioning

confidence: 99%

“…The problem with this approach is that, typically, the frequency responses of piezoelectric elements have resonant characteristics, which are difficult to accurately mimic using fixed component networks. In most cases, improved results can be obtained if the network suggested by one of the techniques listed in refs [6][7][8][9][10] is used as a starting point for an optimization routine, which accounts for frequency dependent radiation resistance and reactance. Recently, Doust and Dix [11] introduced a hardware calibration technique, in which he demonstrated improved overall phase linearity, efficiency and amplitude response of transfer functions, in an electro-acoustic system.…”

Section: Introductionmentioning

confidence: 99%

An approach for correcting magnitude and phase distortion in wideband piezoelectric transducer systems

Assous

Gunn

Hopper

et al. 2007

OCEANS 2007 - Europe

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Abstract-Acoustic ultrasonic measurements are widespread and commonly performed using sensitive piezoelectric sensors. An accurate transducer system response to investigate pressure fluctuations in water and their subsequent detection remains a challenge. Typically, these sensors exploit the resonant behaviour of the piezoelectric active element, being designed to give maximum sensitivity in the bandwidth of interest. Calibration of such transducers can provide both magnitude and phase information describing the way in which the sensor responds to a surface displacement over its frequency range. Such resonant sensors are widely used for ultrasonic applications. The resonant nature of the sensors leads to the use of narrowband signals with central frequencies close to the resonant frequency of the piezoelectric element. Consequently, such devices work efficiently and linearly over only a narrow band of their overall frequency range. This causes phase and magnitude distortion of any linear broadband signal being transmitted through such a transmitter-receiver acoustic system. In the present work, we describe a software calibration technique to correct for distortion in a wideband piezoelectric transducer system. We consider only the input and the final output signals of the whole system. Compensating for the distortion of the magnitude and phase responses, we ensured the signal seen at the receiver represents a good replica of the desired signal. A Gaussian, linear, chirp signal was used to demonstrate our approach. This method may be applied to correct system distortion in a wide variety of ultrasonic applications.

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The Design of Optimum Lumped Broadband Equalizers for Ultrasonic Transducers

Cited by 14 publications

References 5 publications

Bandwidth Enhancement: Correcting Magnitude and Phase Distortion in Wideband Piezoelectric Transducer Systems

Bandwidth Enhancement: Correcting Magnitude and Phase Distortion in Wideband Piezoelectric Transducer Systems

Advances in Piezoelectric Transducers

An approach for correcting magnitude and phase distortion in wideband piezoelectric transducer systems

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