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Periodicals related to Ultrasonic Transducers

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Most published Xplore authors for Ultrasonic Transducers

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Xplore Articles related to Ultrasonic Transducers

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Amplification of ultrasonic waves

1962 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 1962

None


A matched MIC delay line transducer using a series array

1974 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 1974

A series-connected transducer operating over a near octave bandwith in the 2-5 GHz range and requiring no external electrical matching has been designed and fabricated using photolithography and conventional ZnO transducer technology.


Evaluation of a Prototype Sector-Vortex Array Applicator

IEEE 1987 Ultrasonics Symposium, 1987

None


Non-uniformly poled Gaussian and Bessel function transducers

Proceedings., IEEE Ultrasonics Symposium,, 1989

A technique has been developed to polarize piezoelectric ceramic elements with spatially nonuniform electric fields. Used as ultrasonic transducers, these piezoelectric elements then produce nonuniform sound-field profiles corresponding to the spatially nonuniform polarization strength poled into the element. Gaussian transducers and Bessel function transducers have been built using this technique. The Bessel function transducer, of particular interest in achieving diffractionless ...


Perpendicular fluid flow measurement with a spatial array of ultrasonic transducers

2009 IEEE International Ultrasonics Symposium, 2009

The challenge of remotely measuring fluid flow through a plane of interest for a wide range of velocities is addressed using an array of ultrasonic transducers. Unlike traditional transit-time ultrasonic flow measurements, the proposed method uses the angle-of-arrival of a reflected ultrasonic wave to measure flow perpendicular to the path of propagation. The use of angle-of- arrival information avoids the ...


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Educational Resources on Ultrasonic Transducers

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IEEE-USA E-Books

  • Amplification of ultrasonic waves

    None

  • A matched MIC delay line transducer using a series array

    A series-connected transducer operating over a near octave bandwith in the 2-5 GHz range and requiring no external electrical matching has been designed and fabricated using photolithography and conventional ZnO transducer technology.

  • Evaluation of a Prototype Sector-Vortex Array Applicator

    None

  • Non-uniformly poled Gaussian and Bessel function transducers

    A technique has been developed to polarize piezoelectric ceramic elements with spatially nonuniform electric fields. Used as ultrasonic transducers, these piezoelectric elements then produce nonuniform sound-field profiles corresponding to the spatially nonuniform polarization strength poled into the element. Gaussian transducers and Bessel function transducers have been built using this technique. The Bessel function transducer, of particular interest in achieving diffractionless beams was made to produce an ultrasonic beam profile approximating that of the Bessel function J/sub 0/(r) both in amplitude and in phase out to the third zero. The beam profiles of these nonuniformly poled transducers were mapped out in a water-immersion tank with a point probe and compared with beam profiles calculated with a Gauss-Hermite model excellent agreement was obtained. Such transducers containing prescribed field profiles can be electroded and mounted in the same manner as conventional piston transducers.<>

  • Perpendicular fluid flow measurement with a spatial array of ultrasonic transducers

    The challenge of remotely measuring fluid flow through a plane of interest for a wide range of velocities is addressed using an array of ultrasonic transducers. Unlike traditional transit-time ultrasonic flow measurements, the proposed method uses the angle-of-arrival of a reflected ultrasonic wave to measure flow perpendicular to the path of propagation. The use of angle-of- arrival information avoids the inherent requirement of transit-time techniques to have a non-negligible directional component of the propagation path in the flow direction. A successful proof-of-concept was developed to experimentally validate the proposed technique.

  • A tethered front-plate electrode CMUT for broadband air-coupled ultrasound

    Capacitive micromachined ultrasonic transducers (CMUTs) typically consist of a back-plate electrode on a substrate wafer, separated from a front-plate electrode by a small cavity. The electrode structures are usually sealed and when operating in air the majority of these CMUTs are highly resonant. However, for air-coupled applications, this sealing is not strictly necessary allowing other more open electrode structures to be explored. A CMUT structure specifically for air-coupled operation was investigated, consisting of a front-plate electrode that was tethered at only a few points around its periphery. The front-plate was also perforated to increase the overall squeeze-film damping and hence the bandwidth of the device. A series of CMUTs up to 800 μm by 800 μm square was manufactured in a standard CMOS process, using a sacrificial polyimide etch to leave a free-standing aluminum front- plate electrode 1.0 μm thick with a nominal electrode gap of 1.5 μm. A number of thin tethers along the device edges attached the front-plate electrode to the substrate, producing a CMUT structure that was completely open at the edges, with low front-plate stiffness and high squeeze-film damping. A one- dimensional analytical model was formulated to predict the response of the devices, and compared to the measured response of the manufactured CMUTs. The structures were not optimized, but initial results on the prototypes were promising. The devices had a pull-in voltage of only 5 V and a nominal capacitance of 70 pF. The devices were tested as transmitters and receivers over a 15 mm path in air, using a well-characterized broadband transducer as a standard transmitter or receiver. The tethered CMUTs had a center frequency of 400 kHz with a usable bandwidth of over 1 MHz in air, giving a Q-factor of less than 1. However, the devices were not very efficient, with an insertion loss of almost 70 dB and highly damped, as expected. The analytical model also gave reasonably good agreement with the experimental measurements.

  • Thermoacoustic Tomography Modeling with Spectral Element Method

    Summary form only given. In this work, we propose a spectral element method (SEM) to solve the thermoacoustic tomography (TAT) forward problem. With the use of Gauss-Lobatto-Legendre (GLL) polynomials as basis functions and GLL points as quadrature integration points, the SEM can achieve the same accuracy as the FEM with a much lower sampling density, and therefore the number of unknowns can be greatly reduced. A perfectly matched layer (PML) is used at the boundary of the computational domain to absorb outgoing waves. Numerical results are shown to validate the SEM, and to demonstrate the significant advantages of the SEM over the FEM for large-scale realistic TAT problems

  • Evaluation of the mechanical properties of active skeletal muscle using acoustic radiation force impulse imaging

    Acoustic Radiation Force Impulse (ARFI) imaging is a method for characterizing local variations in tissue mechanical response. In this method, a single ultrasonic transducer array is used to both apply temporally short localized radiation forces within tissue and to track the resulting displacements. Tissue displacement is inversely related to tissue stiffness, and the temporal response of tissue to radiation force varies with tissue type. Utilizing a modified Siemens Elegra scanner with a 75L40 transducer array, ARFI images of bicep muscle were generated in the three authors for four levels of activation (0, 2, 4, and 8 kg). Four ARFI datasets were acquired for each loading condition. Data was acquired in real-time, and processed off-line. Statistically significant differences between the unloaded and loaded cases were found in each of the parameters studied (displacement magnitude, recovery velocity magnitude, and time to peak displacement, p < 0.005). Significant differences were also found between subjects (p < 0.01). These results suggest that ARFI imaging has potential for quantifying variations in tissue stiffness in real-time measurements.

  • Optimum Design of SAW-Filters by Linear Programming

    None

  • Underwater acoustic imaging using capacitive micromachined ultrasonic transducer arrays

    Capacitive micromachined ultrasonic transducers (CMUTs) have recently emerged as an alternative technology to piezoelectric transducers, offering advantages such as wide bandwidth, ease of fabricating large arrays and potential for integration with electronic circuits. In this paper, we present 2D and 3D pulse-echo imaging results using ID linear and 2D rectangular CMUT arrays, respectively. The aim of this paper is to demonstrate the viability of CMUTs for underwater acoustic imaging. For imaging experiments, we have fabricated ID and 2D CMUT arrays, and built an experimental setup allowing us to transmit and receive ultrasound signals from individual transducer elements. The image quality obtained shows that CMUTs are a strong alternative to conventional piezoelectric transducer arrays for the design of future generations of underwater acoustic imaging systems.



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