Acoustic analysis of a broadband spiral source for the simultaneous generation of multiple Bessel vortices in air
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Updated: Jan 31, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
Ruben D Muelas-Hurtado1, Joao L Ealo2, Jhon F Pazos-Ospina3
1School of Civil and Geomatic Engineering, Universidad del Valle, Cali, Valle del Cauca 76001, Colombia.
Abstract:
A detailed characterization and analysis of the acoustic field radiated by an active diffraction grating is presented. This is a spiral-shaped source of constant width of the spiral paths and spacing among them, built with flexible ferroelectrets, which is suitable to operate within a broad range of ultrasonic frequencies. The simultaneous airborne generation of multiple Bessel vortex beams with different topological charges along the propagation axis is thoroughly discussed in terms of the structure of the spiral source and the driving frequency, along with some technical details of the prototype. Finally, the quality of the experimentally generated Bessel vortices is discussed, including the phase structure and the amplitude of the acoustic pressure.
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