Frequency characteristics of receiving sensitivity and waveform of an anti-acoustic cavitation hydrophone

Shiiba, Michihisa; Okada, Nagaya; Uchida, Takeyoshi; Kikuchi, Tsuneo; Kurosawa, Minoru Kuribayashi; Takeuchi, Shinichi

doi:10.7567/jjap.53.07ke06

Cited by 22 publications

(14 citation statements)

References 39 publications

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“…Epoxy resins with various specific acoustic impedance are commonly used as backing material for hydrophones. [29][30][31] The capacitance of the sensing area for each hydrophone, C, was also assumed as a constant (i.e., independent of frequency) so that the simulated sensitivity was close to the certificated sensitivity of each hydrophone. Table III shows the properties of the four simulation models.…”

Section: Numerical Simulation Of Hydrophone Sensitivitymentioning

confidence: 99%

Improvement of extrapolating frequency response of hydrophone sensitivity using numerical simulation that includes assumptions about materials and construction of hydrophone for measuring instantaneous acoustic pressure of diagnostic ultrasound

Chiba

Umemura

Yoshioka

2022

Jpn. J. Appl. Phys.

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To evaluate the safety of diagnostic ultrasound, a precise and practical technique for measuring instantaneous acoustic pressure using the frequency response of hydrophone sensitivity has been investigated. We previously confirmed that the extrapolation of the frequency response using constants that are equal to extremes of the frequency range of certificated hydrophone sensitivities is generally effective when this frequency range is narrower than that from 0.5 to 8 times the center frequency of the measured ultrasound. However, this method is not always effective for hydrophones with large frequency response fluctuations. Here, we study whether the effectiveness of the extrapolation could be improved by using numerical simulation that includes assumptions about the materials and construction of the hydrophone and got the prospect that diagnostic ultrasound can be precisely measured using certificated sensitivity even if the upper frequency of certificated sensitivity is only up to twice the center frequency of the diagnostic ultrasound.

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Section: Numerical Simulation Of Hydrophone Sensitivitymentioning

confidence: 99%

Improvement of extrapolating frequency response of hydrophone sensitivity using numerical simulation that includes assumptions about materials and construction of hydrophone for measuring instantaneous acoustic pressure of diagnostic ultrasound

Chiba

Umemura

Yoshioka

2022

Jpn. J. Appl. Phys.

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“…This condition was more severe than the standard HIFU therapy condition, which uses a tone burst signal. In addition, the electrode (titanium plate) of the robust hydrophone was not damaged, even after 10 h of sonication by an ultrasonic cleaner [18].…”

Section: B Characteristics Of Robust Hydrophonementioning

confidence: 99%

Robust hydrophone with hydrothermal PZT thick-film vibrator and titanium front layer for use in high-power ultrasound fields

Okada

Takeuchi

2015

2015 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF), International Symposium on Integrated Func

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Novel robust hydrophones were fabricated by depositing hydrothermally synthesized lead zirconate titanate polycrystalline film on the back-side surface of a titanium plate. These hydrophones were resistant to damage during the measurement of the high-intensity acoustic field formed by a high-intensity focused ultrasound transducer driven continuous wave, for driving power of up to 50 W, and to the acoustic field of an ultrasonic cleaner with generation of inertial acoustic cavitation. The sensitivity of the robust hydrophone was linear up to about 8 MPa. We confirmed the linearity of response for the hydrophone at high acoustic pressure. The fabricated robust hydrophone showed receiving sensitivity across a wide frequency range. Furthermore, we observed the output waveforms of the fabricated robust hydrophone with distortion due to non-linear propagation in water. These results indicate that our hydrophone can detect broadband acoustic signals emitted by oscillating and collapsing acoustic cavitation bubbles. However, the flat tip of the hydrophone disturbed the acoustic field, as shown by the results of sonochemiluminescence in luminol solution. This means that the setting position should be considered for measurements at higher acoustic power. Index Terms-hydrophone; hydrothermally synthesized PZT thick-film; robust; high-intensity ultrasound; poly-crystalline film.

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“…In this study, an anti-cavitation hydrophone was fabricated by depositing a hydrothermally synthesized lead zirconate titanate (PZT) polycrystalline film [3][4] on the back side of a titanium plate.…”

Section: Introductionmentioning

confidence: 99%

Development of anticavitation hydrophone using a titanium front plate: Effect of the titanium front plate in high-intensity acoustic field with generation of acoustic cavitation

Shiiba

Okada

Kurosawa

et al. 2016

Jpn. J. Appl. Phys.

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Novel anticavitation hydrophones were fabricated by depositing a hydrothermally synthesized lead zirconate titanate polycrystalline film at the back of a titanium front plate. These anticavitation hydrophones were not damaged by the measurement of the acoustic field formed by a high-intensity focused ultrasound (HIFU) device. Their sensitivity was improved by approximately 20 dB over that of the conventional anticavitation hydrophone by modifying their basic structure and materials. The durability of the anticavitation hydrophone that we fabricated was compared by exposing it to a high-intensity acoustic field at the focal point of the HIFU field and in the water tank of an ultrasound cleaner. Therefore, the effect of the surface of the titanium front plate on acoustic cavitation was investigated by exposing such a surface to the high-intensity acoustic field. We found that the fabricated anticavitation hydrophone was robust and was not damaged easily, even in the focused acoustic field where acoustic cavitation occurs.

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Frequency characteristics of receiving sensitivity and waveform of an anti-acoustic cavitation hydrophone

Cited by 22 publications

References 39 publications

Improvement of extrapolating frequency response of hydrophone sensitivity using numerical simulation that includes assumptions about materials and construction of hydrophone for measuring instantaneous acoustic pressure of diagnostic ultrasound

Improvement of extrapolating frequency response of hydrophone sensitivity using numerical simulation that includes assumptions about materials and construction of hydrophone for measuring instantaneous acoustic pressure of diagnostic ultrasound

Robust hydrophone with hydrothermal PZT thick-film vibrator and titanium front layer for use in high-power ultrasound fields

Development of anticavitation hydrophone using a titanium front plate: Effect of the titanium front plate in high-intensity acoustic field with generation of acoustic cavitation

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