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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

Issue 3 • Date May 1989

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Displaying Results 1 - 15 of 15
  • The power reflected in a SAW RAC

    Publication Year: 1989, Page(s):297 - 299
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (291 KB)

    Considerations relating to the design of surface-acoustic-wave (SAW) reflective array pulse compressors (RACS), including the effect of array width on power reflected, the transmitted beam profile and the effect of randomized arrays, are discussed. Only a first-order analysis is used. Potential misunderstandings of these issues that could arise from the existing literature are clarified.<> View full abstract»

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  • Continuous-wave surface-acoustic-wave delay-difference device

    Publication Year: 1989, Page(s):300 - 306
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (667 KB)

    A novel surface-acoustic-wave (SAW) device for continuous-wave (CW) delay-difference measurement or wideband interference-rejection at VHF frequencies is described and test results are given. The delay-difference device (DDD) operates at a center frequency of 160 MHz with a 31-MHz bandwidth over which root-mean-square amplitude ripple is 0.13 dB and need not be operated in a gated mode. A pair of ... View full abstract»

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  • High K BaTiO/sub 3/ films from metalloorganic precursors

    Publication Year: 1989, Page(s):307 - 312
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Crack-free and dense BaTiO/sub 3/ films 4 to 8 mu m thick were prepared by spinning a solution of metalloorganic precursors onto an appropriate substrate, and firing and annealing the film in air at certain temperatures to obtain appropriate grain sizes. The electrical properties of the films were studied as a function of grain size, temperature, frequency, and DC bias. Films with a grain size of ... View full abstract»

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  • Ultrasound transducer models for piezoelectric polymer films

    Publication Year: 1989, Page(s):313 - 318
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (583 KB)

    A method is presented for determining the piezoelectric constants and the frequency-dependent dielectric properties of the polymers from a five-step algorithm based on analysis of air-loaded broadband impedance measurements. It is shown how to account for the frequency-dependent lossy properties of these films in an equivalent impedance circuit model and a modified Mason's model. Comparisons betwe... View full abstract»

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  • Analysis of a multielement ultrasound hyperthermia applicator

    Publication Year: 1989, Page(s):319 - 325
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (585 KB)

    An unfocused multielement ultrasound applicator was developed for hyperthermia treatment of superficial tumors. The applicator contains sixteen 3.8-cm/sup 2/ individually controllable elements on a 15.2-cm/sup 2/ piezoelectric ceramic plate. The acoustical power output of each element can be independently applied to facilitate uniform heating throughout the treatment area while minimizing undesire... View full abstract»

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  • An acoustic micrometer and its application to layer thickness measurements

    Publication Year: 1989, Page(s):326 - 331
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (670 KB)

    The principle and system of the acoustic micrometer are described. Its basic performance, with respect to the stability, accuracy, spatial resolution, and temperature dependence, is also discussed. Gold layers electroplated on substrates of 42% Ni-Fe alloy were taken as test specimens in the present study. The measurable range of the thickness for gold layers covered from 1 to 20 mu m when a frequ... View full abstract»

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  • The use of metallic glass scroll as an acoustic transducer element

    Publication Year: 1989, Page(s):332 - 336
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (523 KB)

    A study was made of the piezomagnetic and elastic properties of scrolls of Metglas 2605 SC, used as an acoustic transducer element. This study involved quasi-DC magnetic induction measurements and ultrasonic complex plane analysis of scrolls of various annealing histories. An optimum effective magnetomechanical coupling coefficient. K/sub eff/, of 0.75, was found. The best magnetomechanical respon... View full abstract»

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  • Design and implementation of mixed-mode transducers

    Publication Year: 1989, Page(s):337 - 341
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    In order to design a mixed-mode transducer with high efficiency and broad bandwidth for both longitudinal and shear wave modes, a theory is developed to determine the properties of this transducer with arbitrary acoustic loads at both ends of the piezoelectric element. Several Y-cut lithium niobate (LiNbO/sub 3/) transducers were made on both [110] single-crystal bismuth germanium oxide (Bi/sub 12... View full abstract»

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  • A comparative study of analytical and numerical transient force excitations on an elastic half-space

    Publication Year: 1989, Page(s):342 - 350
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (643 KB)

    The numerical modeling of ultrasonic wave propagation in elastic solids is discussed for nondestructive testing applications because of the relative ease with which the boundaries of realistic defect shapes and testing geometries can be handled. Two-dimensional (2-D) finite-element code has been developed for this purpose yielding good qualitative agreement between numerical predictions and experi... View full abstract»

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  • Orientation of doubly rotated quartz plates

    Publication Year: 1989, Page(s):351 - 355
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (429 KB)

    A derivation from classical spherical trigonometry of equations to compute the orientation of doubly-rotated quartz blanks from Bragg X-ray data is discussed. These are usually derived by compact and efficient vector methods, which are reviewed briefly. They are solved by generating a quadratic equation with numerical coefficients. Two methods exist for performing the computation from measurements... View full abstract»

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  • A theoretical approach for inverse filter design in ultrasonic applications

    Publication Year: 1989, Page(s):356 - 364
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (657 KB)

    A comparison between simulation- and measurement-based characterization is provided for the design of one-dimensional, nonadaptive, inverse filters for ultrasonic applications. Both prefiltering and postfiltering are considered by means of two different filtering strategies performed in the time and frequency domains. The results clearly indicate that theoretical methods can be used successfully, ... View full abstract»

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  • Analysis of homomorphic processing for ultrasonic grain signal characterization

    Publication Year: 1989, Page(s):365 - 375
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    A model for the grain signal is presented, which includes the effect of frequency-dependent scattering and attenuation. This model predicts that the expected frequency increases with scattering and decreases with attenuation. Homomorphic processing was used for spectral smoothing, and the selection of parameters for optimal performance was examined. Experimental results are presented that show bot... View full abstract»

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  • Ultrasound holographic B-scan imaging

    Publication Year: 1989, Page(s):376 - 383
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    An ultrasound holographic B-scan (UHB) imaging apparatus comprising a minicomputer system, a data acquisition unit, and a special 64-element UHB transducer has been developed. Simulation studies and real experiments with a tissue-equivalent phantom show that lateral and longitudinal resolution (-6 dB) of about 1 mm was achieved in the entire image. Furthermore, results from clinical evaluation, in... View full abstract»

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  • Multidepth synthetic aperture processing of ultrasonic data

    Publication Year: 1989, Page(s):384 - 385
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (258 KB)

    The characterization of the size, shape, and location of subsurface discontinuities in metals using multidepth synthetic aperture processing of ultrasonic data is considered. A technique is proposed to increase the lateral resolution and signal-to-noise ratio when metals of large thickness are tested. The first technique to achieve multidepth was dynamic focusing. The aperture in the proposed tech... View full abstract»

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  • Addendum to 'Possible design procedure for low-loss 180 degrees reflecting arrays in SAW devices' (Jan 88 57-60)

    Publication Year: 1989, Page(s):385 - 386
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (146 KB)

    The original paper (ibid., vol.35, no.1, p.57-60, 1988) describes how multiple reflections can be allowed for in SAW reflecting arrays. Comments are now made on the error in frequency response due to truncation of the array to finite length, and on multiple transits between transducers via the array.<> View full abstract»

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Aims & Scope

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control focuses on the theory, design, and application on generation, transmission, and detection of bulk and surface mechanical waves.

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Editor-in-Chief
Steven Freear
s.freear@leeds.ac.uk