Multiple Acoustical Matching Layer Design of Ultrasonic Transducer for Medical Application

Chen, Yong-Gui; Wu, Sean

doi:10.1143/jjap.41.6098

Cited by 13 publications

(5 citation statements)

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“…This simulation model offers a method of simplifying the transducer design, further facilitating the analysis of impedance-matching layers [21,9] for broad-bandwidth application, and tuning the inductance for improving transmitting efficiency [22] and even for array performance simulation.…”

Section: Discussionmentioning

confidence: 99%

PSPICE controlled-source models of analogous circuit for Langevin type piezoelectric transducer

Yeong-Chin¹,

MenqJiun²,

Liu³

2007

SCI CHINA SER G

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The design and construction of wide-band and high efficiency acoustical projector has long been considered an art beyond the capabilities of many smaller groups. Langevin type piezoelectric transducers have been the most candidate of sonar array system applied in underwater communication. The transducers are fabricated, by bolting head mass and tail mass on both ends of stacked piezoelectric ceramic, to satisfy the multiple, conflicting design for high power transmitting capability. The aim of this research is to study the characteristics of Langevin type piezoelectric transducer that depend on different metal loading. First, the Mason equivalent circuit is used to model the segmented piezoelectric ceramic, then, the impedance network of tail and head masses is deduced by the Newton's theory. To obtain the optimal solution to a specific design formulation, PSPICE controlled-source programming techniques can be applied. A valid example of the application of PSPICE models for Langevin type transducer analysis is presented and the simulation results are in good agreement with the experimental measurements. acoustical projector, Langevin type, piezoelectric transducer, stacked piezoelectric ceramic, Mason model, controlled-source, PSPICE In many underwater acoustical applications, electromechanical systems are often composed of a group of identical piezoelectric ceramic segments that are interconnected "mechanically in series and electrically in parallel" [1] so as to produce reinforced mechanical motion for high-power sound generation. In an air backed Langevin type transducer construction application, some practical consideration is in demand [2] , e.g. the head mass is constructed as an alignment shank on the ceramic end and a large flat radiation surface to attain a large radiating loading in the water medium, the tail mass is configured as a horn structure to reduce the transmission power in the air medium

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Section: Discussionmentioning

confidence: 99%

PSPICE controlled-source models of analogous circuit for Langevin type piezoelectric transducer

Yeong-Chin¹,

MenqJiun²,

Liu³

2007

SCI CHINA SER G

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“…A 'system-based' KLM model from prior work (Lamberti et al 1997, Chopra et al 2003, Selfridge and Gehlbach 1985, Oakley 1997, Lockwood and Foster 1994, Wu and Chen 1999, Chen and Sean 2002 was used to include the Antares system transmitters, cable, array and acoustic and electrical loading. This model has produced good agreement between laboratory observations and model results.…”

Section: Array Design Requirement and Modeling For Efficiencymentioning

confidence: 99%

Efficient array design for sonotherapy

et al. 2008

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New linear multi-row, multi-frequency arrays have been designed, constructed and tested as fully operational ultrasound probes to produce confocal imaging and therapeutic acoustic intensities with a standard commercial ultrasound imaging system. The triple-array probes and imaging system produce high quality B-mode images with a center row imaging array at 5.3 MHz and sufficient acoustic power with dual therapeutic arrays to produce mild hyperthermia at 1.54 MHz. The therapeutic array pair in the first probe design (termed G3) utilizes a high bandwidth and peak pressure, suitable for mechanical therapies. The second multi-array design (termed G4) has a redesigned therapeutic array pair which is optimized for a high time-averaged power output suitable for mild hyperthermia applications. The 'thermal therapy' design produces more than 4 W of acoustic power from the low-frequency arrays with only a 10.5 degrees C internal rise in temperature after 100 s of continuous use with an unmodified conventional imaging system or substantially longer operation at lower acoustic power. The low-frequency arrays in both probe designs were examined and contrasted for real power transfer efficiency with a KLM model which includes all lossy contributions in the power delivery path from system transmitters to the tissue load. Laboratory verification was successfully performed for the KLM-derived estimates of transducer parallel model acoustic resistance and dissipation resistance, which are the critical design factors for acoustic power output and undesired internal heating, respectively.

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“…The difference in the two impedances produces two resonant frequencies. Adjusting the thickness of the matching layer brings the two resonant frequencies close enough to couple to expand the working bandwidth of the transducing material [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Research and Fabrication of High-Frequency Broadband and Omnidirectional Transmitting Transducer

Hao

Wang

Zhong

et al. 2018

Sensors

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A wide-band cylindrical transducer was developed by using the wide band of the composite material and the matched matching layer for multimode coupling. Firstly, the structure size of the transducer’s sensitive component was designed by using ANSYS simulation software. Secondly, the piezoelectric composite ring-shaped sensitive component was fabricated by the piezoelectric composite curved-surface forming process, and the matching layer was coated on the periphery of the ring-shaped piezoelectric composite material. Finally, it was encapsulated and the electrodes were drawn out to make a high-frequency broadband horizontal omnidirectional water acoustic transducer prototype. After testing, the working frequency range of the transducer was 230–380 kHz, and the maximum transmission voltage response was 168 dB in the water.

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Multiple Acoustical Matching Layer Design of Ultrasonic Transducer for Medical Application

Cited by 13 publications

References 0 publications

PSPICE controlled-source models of analogous circuit for Langevin type piezoelectric transducer

PSPICE controlled-source models of analogous circuit for Langevin type piezoelectric transducer

Efficient array design for sonotherapy

Research and Fabrication of High-Frequency Broadband and Omnidirectional Transmitting Transducer

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