Grating lobe reduction in transducer arrays through structural filtering of supercritical plates

Brian E. Anderson, W. Jack Hughes, Stephen A. Hambric

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of placing a structural acoustic filter between water and the transducer elements of an array to help reduce undesirable grating lobes is investigated. A supercritical plate is mounted to transducer elements with a thin decoupling polyurethane layer between the transducers and the plate. The plate acts as a radiation/incidence angle filter to pass energy at angles near normal incidence, but suppress energy at large incidence angles. Grating lobe reduction is achieved at the expense of limiting the available steering of the main lobe. Within this steer angle limitation, the main lobe can be steered as normal while the grating lobe level is reduced by the plate's angular filtering. The insertion of a plate structural filter provides, in principal, an inexpensive and easily implemented approach to extend usable frequency bandwidth with reduced level grating lobes, without increasing the number of array elements. Even though the data match theory well, a practical material has yet to be found that possesses optimal material properties to make the proposed idea practical. This work represents the first attempt to advantageously utilize a plate above its critical frequency to provide angular dependent sound transmission filtering.

Original languageEnglish (US)
Pages (from-to)612-619
Number of pages8
JournalJournal of the Acoustical Society of America
Volume126
Issue number2
DOIs
StatePublished - Jan 1 2009

Fingerprint

lobes
transducers
gratings
incidence
filters
critical frequencies
sound transmission
decoupling
insertion
bandwidth
acoustics
energy
radiation
water
Filter
Energy

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

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Grating lobe reduction in transducer arrays through structural filtering of supercritical plates. / Anderson, Brian E.; Hughes, W. Jack; Hambric, Stephen A.

In: Journal of the Acoustical Society of America, Vol. 126, No. 2, 01.01.2009, p. 612-619.

Research output: Contribution to journalArticle

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