Microfabrication of stacks of acoustic matching layers for 15MHz ultrasonic transducers

Manh, Tung; Nguyen, Anh-Tuan Thai; Johansen, Tonni Franke; Hoff, Lars

doi:10.1016/j.ultras.2013.08.015

Cited by 21 publications

(16 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximal sensitivity is obtained when the acoustic impedance of the matching layer Z 2 is close to

, where Z 1 is the acoustic impedance of the waveguide material and Z 3 is the acoustic impedance of the measured liquid medium. In our case, the impedance Z 2 must be intermediate between the acoustic impedances of the waveguide Z 1 and the measured liquid Z 3 [ 33 , 34 , 35 ]. Steel and titanium were proposed as materials for the waveguides ( Section 2.1 ).…”

Section: Theory Analysis and Modelling Resultsmentioning

confidence: 99%

Ultrasonic Technique for Density Measurement of Liquids in Extreme Conditions

Kažys

Šliteris

Rekuvienė

et al. 2015

Sensors

View full text Add to dashboard Cite

An ultrasonic technique, invariant to temperature changes, for a density measurement of different liquids under in situ extreme conditions is presented. The influence of geometry and material parameters of the measurement system (transducer, waveguide, matching layer) on measurement accuracy and reliability is analyzed theoretically along with experimental results. The proposed method is based on measurement of the amplitude of the ultrasonic wave, reflected from the interface of the solid/liquid medium under investigation. In order to enhance sensitivity, the use of a quarter wavelength acoustic matching layer is proposed. Therefore, the sensitivity of the measurement system increases significantly. Density measurements quite often must be performed in extreme conditions at high temperature (up to 220 °C) and high pressure. In this case, metal waveguides between piezoelectric transducer and the measured liquid are used in order to protect the conventional transducer from the influence of high temperature and to avoid depolarization. The presented ultrasonic density measurement technique is suitable for density measurement in different materials, including liquids and polymer melts in extreme conditions. A new calibration algorithm was proposed. The metrological evaluation of the measurement method was performed. The expanded measurement uncertainty Uρ = 7.4 × 10−3 g/cm3 (1%).

show abstract

“…The maximal sensitivity is obtained when the acoustic impedance of the matching layer Z 2 is close to

Section: Theory Analysis and Modelling Resultsmentioning

confidence: 99%

Ultrasonic Technique for Density Measurement of Liquids in Extreme Conditions

Kažys

Šliteris

Rekuvienė

et al. 2015

Sensors

View full text Add to dashboard Cite

show abstract

“…The single quarter-wavelength matching layer approach has been proposed and extensively studied 14 15 16 17 18 to tackle the problem by taking advantage of destructive and constructive interference of ultrasound. Composite designs that stack two or more layers of quarter-wavelength thick matching materials have also been explored to improve the spectral performance 19 20 21 22 . These quarter-wavelength-matching-based solutions have improved the ultrasound propagation between piezoelectric materials and the target medium.…”

mentioning

confidence: 99%

Broadband gradient impedance matching using an acoustic metamaterial for ultrasonic transducers

Yang

Liu

et al. 2017

Sci Rep

View full text Add to dashboard Cite

High-quality broadband ultrasound transducers yield superior imaging performance in biomedical ultrasonography. However, proper design to perfectly bridge the energy between the active piezoelectric material and the target medium over the operating spectrum is still lacking. Here, we demonstrate a new anisotropic cone-structured acoustic metamaterial matching layer that acts as an inhomogeneous material with gradient acoustic impedance along the ultrasound propagation direction. When sandwiched between the piezoelectric material unit and the target medium, the acoustic metamaterial matching layer provides a broadband window to support extraordinary transmission of ultrasound over a wide frequency range. We fabricated the matching layer by etching the peeled silica optical fibre bundles with hydrofluoric acid solution. The experimental measurement of an ultrasound transducer equipped with this acoustic metamaterial matching layer shows that the corresponding −6 dB bandwidth is able to reach over 100%. This new material fully enables new high-end piezoelectric materials in the construction of high-performance ultrasound transducers and probes, leading to considerably improved resolutions in biomedical ultrasonography and compact harmonic imaging systems.

show abstract

“…Traditionally, the first matching materials are composites made of solid particles/templates and polymer [9]. Tung Manh et al [10] used a silicon–polymer composite of Spurr’s epoxy with an acoustic impedance of 9.5 MRayl as the first matching layer, and the 14.6 MHz PZT transducer showed a −6 dB bandwidth of 70% and an insertion loss of −18.4 dB. An 11.6 MHz PZT-5A transducer was reported by H.J.…”

Section: Introductionmentioning

confidence: 99%

Magnesium Alloy Matching Layer for High-Performance Transducer Applications

Wang

Tao

Guo

et al. 2018

Sensors

View full text Add to dashboard Cite

In this paper, we report the use of magnesium alloy (AZ31B) as the matching material for PZT-5H ultrasonic transducers. The AZ31B has an acoustic impedance of 10.3 MRayl, which provides a good acoustic impedance match for PZT-5H ultrasonic transducers in water medium based on the double matching layer theory. Two PZT-5H transducers with different center frequencies were designed and fabricated using the AZ31B. The respective center frequencies of the two fabricated transducers were 4.6 MHz and 9.25 MHz. The 4.6 MHz transducer exhibits a −6 dB bandwidth of 79% and two-way insertion loss of −11.11 dB. The 9.25 MHz transducer also shows good performance: −6 dB bandwidth of 71% and two-way insertion loss of −14.43 dB. The properties of the two transducers are superior to those of transducers using a composite matching layer, indicating that the magnesium alloy may be a promising alternative for high-performance transducers.

show abstract

Microfabrication of stacks of acoustic matching layers for 15MHz ultrasonic transducers

Cited by 21 publications

References 19 publications

Ultrasonic Technique for Density Measurement of Liquids in Extreme Conditions

Ultrasonic Technique for Density Measurement of Liquids in Extreme Conditions

Broadband gradient impedance matching using an acoustic metamaterial for ultrasonic transducers

Magnesium Alloy Matching Layer for High-Performance Transducer Applications

Contact Info

Product

Resources

About