Ultrasonic Bessel beam generation from radial modes of piezoelectric discs

Journal Article · Tue Feb 05 00:00:00 EST 2019 · Ultrasonics

DOI:https://doi.org/10.1016/j.ultras.2019.02.002· OSTI ID:1501809

Chillara, Vamshi ^[1]; Davis, Eric Sean ^[2]; Pantea, Cristian ^[1]; Sinha, Dipen N. ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Houston, TX (United States)

We present comprehensive analytical and experimental investigations on ultrasonic Bessel beam generation from radial modes of piezoelectric disc transducers. The Bessel vibration pattern of the radial modes was experimentally measured using Laser Doppler Vibrometry and was found to be in very good agreement with those obtained from numerical simulations. Ultrasonic beam profiles from the first four radial modes of the piezoelectric disc were measured using a hydrophone in a water tank. The results obtained from the experimental scans were compared to the predictions from an analytical model and were found to be in very good agreement. Also, the Bessel beams generated from the radial modes (except the first) of the piezoelectric discs were found to have narrow beam width for the central lobe compared to those from an ideal piston source of same size. The proposed approach of using radial modes for Bessel beam generation finds applications in imaging, acoustic particle manipulation and trapping, and acousto-optics.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE). Geothermal Technologies Office (EE-4G)
• Grant/Contract Number: 89233218CNA000001
• OSTI ID: 1501809
• Report Number(s): LA-UR--18-26929
• Journal Information: Ultrasonics, Journal Name: Ultrasonics Vol. 96; ISSN 0041-624X
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

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