Influence of backing and matching layers in ultrasound transducer performance

Nascimento, Valéria Monteiro do; Button, Vera Lúcia da Silveira Nantes; Maia, Joaquim Miguel; Costa, Eduardo Tavares; Oliveira, Eduardo Jorge Valadares

doi:10.1117/12.479924

Cited by 9 publications

(6 citation statements)

References 4 publications

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“…Moreover, for typical transducers, the bandwidth is defined by the ratio between the difference of the frequencies at which the spectrum intensity decays to 50 % of its maximum value (f upper ― f lower ) and the central frequency f central [ 39 ]:

100

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Section: Resultsmentioning

confidence: 99%

A fiber optoacoustic emitter with controlled ultrasound frequency for cell membrane sonoporation at submillimeter spatial resolution

et al. 2020

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Graphical abstract A fiber-based optoacoustic emitter is developed, serving as the most miniaturized ultrasound point source so far, with sub-millimeter confinement. Controllable frequencies are achieved and further induce cell membrane sonoporation with frequency dependent efficiency. By solving the problem of compromise between sub-MHz frequency and sub-millimeter precision via breaking the diffraction limit, the FOE shows a great potential in region-specific cell modulation.

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100

…”

Section: Resultsmentioning

confidence: 99%

A fiber optoacoustic emitter with controlled ultrasound frequency for cell membrane sonoporation at submillimeter spatial resolution

et al. 2020

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“…Castor oil was injected into the backing layer container with a full load of 4.45 mm 3 . The backing layer was constructed with a λ/4-thick matching layer [ 23 , 24 ]. The thickness of the backing layer must more than four times that of the wavelength matching layer.…”

Section: Methodsmentioning

confidence: 99%

A Fluidics-Based Double Flexural Membrane Piezoelectric Micromachined Ultrasonic Transducer (PMUT) for Wide-Bandwidth Underwater Acoustic Applications

Ahmad

Rahman

Zain

et al. 2021

Sensors

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In acoustic receiver design, the receiving sensitivity and bandwidth are two primary parameters that determine the performance of a device. The trade-off between sensitivity and bandwidth makes the design very challenging, meaning it needs to be fine-tuned to suit specific applications. The ability to design a PMUT with high receiving sensitivity and a wide bandwidth is crucial to allow a wide spectrum of transmitted frequencies to be efficiently received. This paper presents a novel structure involving a double flexural membrane with a fluidic backing layer based on an in-plane polarization mode to optimize both the receiving sensitivity and frequency bandwidth for medium-range underwater acoustic applications. In this structure, the membrane material and electrode configuration are optimized to produce good receiving sensitivity. Simultaneously, a fluidic backing layer is introduced into the double flexural membrane to increase the bandwidth. Several piezoelectric membrane materials and various electrode dimensions were simulated using finite element analysis (FEA) techniques to study the receiving performance of the proposed structure. The final structure was then fabricated based on the findings from the simulation work. The pulse–echo experimental method was used to characterize and verify the performance of the proposed device. The proposed structure was found to have an improved bandwidth of 56.6% with a receiving sensitivity of −1.8864 dB rel 1 V µPa. For the proposed device, the resonance frequency and center frequency were 600 and 662.5 kHz, respectively, indicating its suitability for the targeted frequency range.

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“…To achieve better energy transmission between the piezoelectric layer and the medium, the acoustic impedance of piezoelectric materials should be near that of the biological tissues for imaging 38 . The other one is the thick backing layer that can provide mechanical support to the active element and prevent reverberation 39 . To date, depending on the design requirements, the traditional piezoelectric transducer can be commonly produced as single element or arrays.…”

Section: Conventional-piezoelectric Transducermentioning

confidence: 99%

Capacitive micromachined ultrasound transducers for intravascular ultrasound imaging

et al. 2020

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Intravascular ultrasound (IVUS) is a burgeoning imaging technology that provides vital information for the diagnosis of coronary arterial diseases. A significant constituent that enables the IVUS system to attain high-resolution images is the ultrasound transducer, which acts as both a transmitter that sends acoustic waves and a detector that receives the returning signals. Being the most mature form of ultrasound transducer available in the market, piezoelectric transducers have dominated the field of biomedical imaging. However, there are some drawbacks associated with using the traditional piezoelectric ultrasound transducers such as difficulties in the fabrication of high-density arrays, which would aid in the acceleration of the imaging speed and alleviate motion artifact. The advent of microelectromechanical system (MEMS) technology has brought about the development of micromachined ultrasound transducers that would help to address this issue. Apart from the advantage of being able to be fabricated into arrays with lesser complications, the image quality of IVUS can be further enhanced with the easy integration of micromachined ultrasound transducers with complementary metal-oxide-semiconductor (CMOS). This would aid in the mitigation of parasitic capacitance, thereby improving the signal-to-noise. Currently, there are two commonly investigated micromachined ultrasound transducers, piezoelectric micromachined ultrasound transducers (PMUTs) and capacitive micromachined ultrasound transducers (CMUTs). Currently, PMUTs face a significant challenge where the fabricated PMUTs do not function as per their design. Thus, CMUTs with different array configurations have been developed for IVUS. In this paper, the different ultrasound transducers, including conventional-piezoelectric transducers, PMUTs and CMUTs, are reviewed, and a summary of the recent progress of CMUTs for IVUS is presented.

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Influence of backing and matching layers in ultrasound transducer performance

Cited by 9 publications

References 4 publications

A fiber optoacoustic emitter with controlled ultrasound frequency for cell membrane sonoporation at submillimeter spatial resolution

A fiber optoacoustic emitter with controlled ultrasound frequency for cell membrane sonoporation at submillimeter spatial resolution

A Fluidics-Based Double Flexural Membrane Piezoelectric Micromachined Ultrasonic Transducer (PMUT) for Wide-Bandwidth Underwater Acoustic Applications

Capacitive micromachined ultrasound transducers for intravascular ultrasound imaging

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