Underwater single crystal piezocomposite transducer with extended usable frequency band

Ellen Sagaas Røed; Martin Bring; Martijn Frijlink; Andreas Henriksen; Frank Tichy; Else-Marie Åsjord; Lars Hoff

doi:10.1016/j.ultras.2022.106794

Underwater single crystal piezocomposite transducer with extended usable frequency band

Ultrasonics. 2022 Sep:125:106794. doi: 10.1016/j.ultras.2022.106794. Epub 2022 Jun 16.

Authors

Ellen Sagaas Røed¹, Martin Bring², Martijn Frijlink³, Andreas Henriksen⁴, Frank Tichy⁵, Else-Marie Åsjord⁶, Lars Hoff⁷

Affiliations

¹ Kongsberg Maritime Sensors & Robotics, Strandpromenaden 50, 3183 Horten, Norway; University of South-Eastern Norway, Raveien 215, 3184 Borre, Norway. Electronic address: [email protected].
² Kongsberg Maritime Sensors & Robotics, Strandpromenaden 50, 3183 Horten, Norway. Electronic address: [email protected].
³ University of South-Eastern Norway, Raveien 215, 3184 Borre, Norway. Electronic address: [email protected].
⁴ Kongsberg Maritime Sensors & Robotics, Strandpromenaden 50, 3183 Horten, Norway. Electronic address: [email protected].
⁵ Kongsberg Maritime Sensors & Robotics, Strandpromenaden 50, 3183 Horten, Norway. Electronic address: [email protected].
⁶ Kongsberg Maritime Sensors & Robotics, Strandpromenaden 50, 3183 Horten, Norway. Electronic address: [email protected].
⁷ University of South-Eastern Norway, Raveien 215, 3184 Borre, Norway. Electronic address: [email protected].

PMID: 35752020
DOI: 10.1016/j.ultras.2022.106794

Abstract

A single crystal/epoxy 1-3 composite plate transducer with air backing and two acoustic matching layers was modelled, fabricated and compared to a similar PZT transducer. For the relevant underwater applications, the usable frequency band is restricted by reactive electrical power. The design goal was to provide an underwater transmitter that could be operated over a wide range of frequencies, but not necessarily create a single pulse spanning the entire frequency band. The thicknesses and the characteristic acoustic impedances of the matching layers were therefore optimized for a wide passband rather than a maximally flat passband. The resulting single crystal transducer had reactive power below 50 % in a frequency band 132 % wide relative to the center frequency.

Keywords: Matching layer; Piezoelectric; Single crystal; Transducer.

MeSH terms

Acoustics*
Equipment Design
Transducers*