Measurement and modeling of acoustic radiation force of focused ultrasound beam on an elastic sphere in water

Karzova, M.; Nikolaeva, A.; Tsysar, S.; Khokhlova, V.; Sapozhnikov, O.

Авторы: Karzova M., Nikolaeva A., Tsysar S., Khokhlova V., Sapozhnikov O.
Журнал: Proceedings of Meetings on Acoustics
Том: 32
Номер: 1
Год издания: 2017
Первая страница: 045011/1
Последняя страница: 045011/6
DOI: 10.1121/2.0000726
Аннотация: A method for measuring acoustic radiation force (ARF) acting on a mm-sized spherical object positioned on an axis of a focused ultrasound beam is proposed. The method is based on the balance between the ARF, gravity, and buoyancy forces acting on the object and initiating its movement when the value of the ARF crosses a certain threshold. Single-element 1.072 MHz transducer (100 mm aperture and 70 mm focal length) was used to generate a focused ultrasound beam in upward vertical direction in water. A spherical nylon target (6 mm diameter) was positioned at different distances along the beam axis. For each distance the beam power was gradually decreased until the target started to move down from a trap. At this threshold source power, the value of ARF was determined as a difference between the gravity and buoyancy forces. ARF was also calculated from the pressure distribution reconstructed from an acoustic hologram of the source and parameters of the scatterer. Experimental and theoretical results were in a good agreement in post focal region of the beam. It was shown that the most effective pushing occurred before and after the focus where the beam was slightly wider than the scatterer.
Добавил в систему: Лапина Анастасия Васильевна

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Measurement and modeling of acoustic radiation force of focused ultrasound beam on an elastic sphere in waterстатья

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