NDLI: Airborne ultrasonic phased arrays using ferroelectrets: a new fabrication approach

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IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control - Front cover

IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society

IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society

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Influence of Pb and La contents on the lattice configuration of La-substituted Pb(Zr,Ti)O₃ films fabricated by CSD method

Nonlinear pyroelectric energy harvesting from relaxor single crystals

Adaptive spectral doppler estimation

Fractional derivative models for ultrasonic characterization of polymer and breast tissue viscoelasticity

Basic considerations in the use of coded excitation for color flow imaging applications

Numerical analysis of variability in ultrasound propagation properties induced by trabecular microstructure in cancellous bone

Error in estimates of tissue material properties from shear wave dispersion ultrasound vibrometry

The application of synthetic focusing for imaging crack-like defects in pipelines using guided waves

High-frequency tortuosity relaxation in open-cell foams

A lateral-field-excited LiTaO₃ high-frequency bulk acoustic wave sensor

Pulse echo and combined resonance techniques: a full set of LGT acoustic wave constants and temperature coefficients

Ultrasonic trapping of small particles by a vibrating rod

Full-wave analysis of piezoelectric boundary waves propagating along metallic grating sandwiched between two semi-infinite layers

Feasibility of ultra-wideband SAW RFID tags meeting FCC rules

The use of real or complex coupling coefficients for lossy piezoelectric materials

Fabrication and performance of high-frequency composite transducers with triangular-pillar geometry

A 256 x 256 2-D array transducer with row-column addressing for 3-D rectilinear imaging

Airborne ultrasonic phased arrays using ferroelectrets: a new fabrication approach

Reduced harmonic representation for continuous wave, shock-producing focused beams

Filled and unfilled temperature-dependent epoxy resin blends for lossy transducer substrates

Low acoustic attenuation silicone rubber lens for medical ultrasonic array probe

Thickness-shear vibration of an AT-cut quartz plate with elliptical electrodes and implications in optimal blank geometry

Three-dimensional reconstruction of the bright ring echogenicity from porcine blood upstream in a stenosed tube

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Airborne ultrasonic phased arrays using ferroelectrets: a new fabrication approach

Content Provider	IEEE Xplore Digital Library
Author	Ealo, J.L. Camacho, J.J. Fritsch, C.
Copyright Year	1986
Abstract	In this work, a novel procedure that considerably simplifies the fabrication process of ferroelectret-based multi-element array transducers is proposed and evaluated. Also, the potential of ferroelectrets being used as active material for aircoupled ultrasonic transducer design is demonstrated. The new construction method of multi-element transducers introduces 2 distinctive improvements. First, active ferroelectret material is not discretized into elements, and second, the need of structuring upper and/or lower electrodes in advance of the permanent polarization of the film is removed. The aperture discretization and the mechanical connection are achieved in one step using a through-thickness conductive tape. To validate the procedure, 2 linear array prototypes of 32 elements, with a pitch of 3.43 mm and a wide usable frequency range from 30 to 300 kHz, were built and evaluated using a commercial phased-array system. A low crosstalk among elements, below -30 dB, was measured by interferometry. Likewise, a homogeneous response of the array elements, with a maximum deviation of plusmn1.8 dB, was obtained. Acoustic beam steering measurements were accomplished at different deflection angles using a calibrated microphone. The ultrasonic beam parameters, namely, lateral resolution, side lobe level, grating lobes, and focus depth, were congruent with theory. Acoustic images of a single reflector were obtained using one of the array elements as the receiver. Resulting images are also in accordance with numerical simulation, demonstrating the feasibility of using these arrays in pulse-echo mode. The proposed procedure simplifies the manufacturing of multidimensional arrays with arbitrary shape elements and not uniformly distributed. Furthermore, this concept can be extended to nonflat arrays as long as the transducer substrate conforms to a developable surface.
File Size	1270401
File Format	PDF
ISSN	08853010
Volume Number	56
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phased arrays Fabrication Ultrasonic transducers Ultrasonic transducer arrays Acoustic measurements Ultrasonic variables measurement Acoustic beams Conducting materials Electrodes Polarization
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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