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Experimental and Numerical Study on the Acoustic Mapping and Radiation Force Quantification of Focused Ultrasound Transducers

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Recently, a focused ultrasound radiation force excitation technique has been explored for modal excitation. However, in order to use it as a practical method for experimental modal analysis, the capability of quantifying the force input is needed. This paper describes the numerical simulation of ultrasound pressure mapping generated from focused ultrasound transducers using Rayleigh Integral and boundary element method as well as the estimation of the resulting focused radiation force based on the ultrasound radiation force theory and double sideband suppressed carrier amplitude modulation (DSB-SC AM) signal. Vibration velocity of the sound emitting surface of ultrasound transducers was measured using three dimensional (3D) Scanning Laser Doppler Vibrometer (SLDV) and used as the input in the acoustic simulation. The numerical results are experimentally verified by acoustic measurement using precision acoustic microphones. Comparisons show that the simulation results agree well with that of the experiment. The ultrasound pressure is found to be in the level of 1000 Pa and the pressure field is found to be highly focused and has a spot size of ~ Φ3 mm, making it possible to be used as non-contact excitation for modal analysis.
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Document Type: Research Article

Affiliations: University of Massachusetts Lowell

Publication date: December 18, 2018

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