Title:
Frequency-steered Acoustic Transducer (FSAT) Using A Spiral Array
Frequency-steered Acoustic Transducer (FSAT) Using A Spiral Array
Files
Author(s)
Advisor(s)
Editor(s)
Collections
Supplementary to
Permanent Link
Abstract
Frequency-steerable acoustic transducers (FSATs) that allow directional generation or sensing of waves propagating in two-dimensional domains. Directionality is the result of the spatial filtering effect produced by the characteristic shape of the sensing surface. A wavenumber spiral FSAT (WS-FSAT) maps the direction of wave sensing in the [0°, 180°] range to a specific frequency component in the spectrum of the received signal. The use of a wavenumber spiral FSAT operating in sensing mode can be used for the localization of broadband acoustic events. One configuration includes a broadband source generating guided elastic waves in an isotropic plate. The WS-FSAT records the plate response and defines the source location through a time-frequency analysis of the received signal. The frequency selective response of the WS-FSAT directly maps the dominant component of the received signal to the direction of arrival of the incoming wave, thus greatly facilitating the source localization procedure.
Sponsor
Date Issued
2/24/2015
Extent
Resource Type
Text
Resource Subtype
Patent