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

Abstract

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.

Experimental evaluation of high-intensity ultrasound source system using acoustic waveguide for calibration of hydrophone

“…One end of the cylindrical acoustic waveguide is placed at the measured focal position of the spherical concave ultrasound transducer. The anticavitation hydrophone developed in our laboratory 24,25) is scanned along the central axis (y-axis), lateral axis (x-axis), and perpendicular axis (z-axis) of our proposed ultrasound source system to measure the spatial distribution of acoustic pressure. The peak-to-peak voltage V a (p-p) of 136 V was applied to the concave-type transducer, and the preamplifier gain G p of 60 dB was set.…”

“…Hence, high-intensity ultrasound fields are required for nonlinear calibration or evaluation. The development of a durable anticavitation hydrophone 24,25) that can measure the spatial distribution of high-intensity acoustic fields, and simultaneously, the development of a high-intensity ultrasound source that can transmit highintensity ultrasound waves are also required.…”

Effect of dissolved oxygen level of water on ultrasonic power measured using calorimetry

“…The HIFU devices used in clinical practice destroy cancer cells via the thermal effect of high-power ultrasound. [8][9][10][11] However, normal cells are also exposed to such ultrasonic thermal effects. The thermal index (TI) 12,13) is used to quantify the thermal effect of ultrasound on the human body.…”

Effect of ultrasonic cavitation on measurement of sound pressure using hydrophone

“…This hydrophone can measure high sound pressures in a wide range of ultrasonic frequencies within which a high-intensity continuous ultrasound is irradiated and many cavitation bubbles occur. 21,22) Theoretically, sound intensity is proportional to the effective electric input power applied to a transducer. 23) Thus, sound pressure is proportional to square root of electric input power.…”