Inexpensive acoustoelectric hydrophone for mapping high intensity ultrasonic fields

Simulation-Based Optimization of the Acoustoelectric Hydrophone for Mapping an Ultrasound Beam

Most single element hydrophones depend on a piezoelectric material that converts pressure changes to electricity. These devices, however, can be expensive, susceptible to damage at high pressure, and/or have limited bandwidth and sensitivity. The acousto-electric (AE) hydrophone is based on the AE effect, an interaction between electrical current and acoustic pressure generated when acoustic wa...

Fabrication and characterization of an indium tin oxide acoustoelectric hydrophone

Clinical ultrasound (US) imaging and therapy require a precise knowledge of the intensity distribution of the acoustic field. Although piezoelectric hydrophones are most common, these devices are limited in terms of, for example, type of materials, cost, and performance at high frequency and pressure. As an alternative to conventional acoustic detectors, we describe acoustoelectric hydrophones,...

Measurement of high intensity focused ultrasound fields by a fiber optic probe hydrophone.

The acoustic fields of a high intensity focused ultrasound (HIFU) transducer operating either at its fundamental (1.1 MHz) or third harmonic (3.3 MHz) frequency were measured by a fiber optic probe hydrophone (FOPH). At 1.1 MHz when the electric power applied to the transducer was increased from 1.6 to 125 W, the peak positive/negative pressures at the focus were measured to be p(+) = 1.7-23.3 ...

Optimizing Ultrasonic Intensity for High Intensity Focused Ultrasound Therapy

Degradation of DNA in high-intensity focused ultrasonic fields at 1 MHz.

Gassy and degassed aqueous solutions of DNA were treated ultrasonically while monitoring the field for discrate cavitation events. At irradiation intensities greater than about 500 W/cm 2, transient cavitation is shown to be responsible forthe observed reduction i molecular weight. At intensifies of200 to 288 W/cm 2, degradation of DNA was observed which did not depend upon transient cavitation.