Abstract
To achieve wide-frequency (20 kHz-2 MHz) high-power output (10 MPa) of Double Parabolic refLectors wave-guided Ultrasonic tranSducers (DPLUS), this paper investigated the DPLUS with hard-type PZTs. Under resonant excitation of the DPLUS waveguide, around 30 harmonic longitudinal modes from the thin waveguide (1 mm in diameter and 40 mm long) can be excited between 20 kHz to 2 MHz. From 20 kHz to 0.4 MHz, the maximum peak vibration velocity was 7.5 m/s; from 1 MHz to 2 MHz, the maximum peak vibration velocity of hard-type PZT DPLUS (7 m/s) was 3.5 times of soft-type piezoelectric materials DPLUS (2 m/s). Acoustic evaluation revealed large acoustic pressure at a wide frequency range: 0.46 MPa (at 31 kHz), 10 MPa (at 590 kHz), 7.7 MPa (at 1.154 MHz), and 7.2 MPa (at 1.322 MHz). Results proved wide-frequency and high-power operation of DPLUS, which are significant for realizing various applications.
Highlights
High intensity focused ultrasound (HIFU) transducers andBolt-clamped Langevin transducers (BLT) are two kinds of typical high-power ultrasonic transducers
HIFU transducers are usually used in the frequency range of 0.75 to 3 MHz while BLTs are targeted for 20 to 100 kHz
High acoustic pressure cannot be measured with this hydrophone, so the applied voltage to Double Parabolic refLectors wave-guided Ultrasonic tranSducer (DPLUS) was around 5 Vp-p
Summary
High intensity focused ultrasound (HIFU) transducers and. Bolt-clamped Langevin transducers (BLT) are two kinds of typical high-power ultrasonic transducers. HIFU transducers are usually used in the frequency range of 0.75 to 3 MHz (high frequency) while BLTs are targeted for 20 to 100 kHz (low frequency). HIFU is widely used for therapeutic ultrasound applications [1-2], and the destruction effects on the tissue include thermal effects and mechanical effects. Mechanical effects involve the acoustic cavitation produced under the high-intensity ultrasound. BLTs are widely used in cavitationrelated engineering applications [3] such as ultrasonic cleaning, cavitation-assisted chemical reaction. HIFU transducers can generate high-intensity ultrasound using the acoustic focusing reflectors.
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