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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

Issue 6 • Date Nov. 1995

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Displaying Results 1 - 23 of 23
  • Calculation of Bleustein-Gulyaev wave parameters in KTiOPO/sub 4/ crystal

    Publication Year: 1995
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (118 KB)

    Velocities and electromechanical coupling coefficients of Bleustein-Gulyaev waves (GBW) were calculated for two cuts of KTiOPO/sub 4/ crystal. It was found that velocity and maximum electromechanical coupling coefficient of BGW are equal to about 4482 m/s and 7.4/spl middot/10/sup -4/, respectively. BGW in the crystal can find applications in chemical sensors. View full abstract»

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  • Gas thermal conductivity sensor based on SAW

    Publication Year: 1995, Page(s):978 - 980
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (163 KB)

    An uncoated surface acoustic wave (SAW) delay line integrated with a suitable film heater is used as a gas sensitive element based on thermal conductivity change. It detects concentrations from 0.1-100% of H/sub 2/, O/sub 2/, He, and Ar in N/sub 2/ in the temperature range from 20-150/spl deg/C. The value and sign of the SAW gas response are controlled by substrate material and reference gas. View full abstract»

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  • Shear-wave focusing with a laser-ultrasound phased-array

    Publication Year: 1995, Page(s):981 - 988
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (469 KB)

    Pulsed laser arrays have been used to improve the beam parameters of laser generated ultrasound. The focusing and steering of shear-acoustic-wave beams generated by an array of thermoelastic sources has been investigated. A modeling of the impulse diffraction response of a single line source was derived from the point source model (Surface Center Of Expansion) of the thermoelastic source. The acou... View full abstract»

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  • Pressure pulse distortion by hydrophones due to diminished low frequency response

    Publication Year: 1995, Page(s):989 - 992
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB)

    In characterizing the bandwidth of measurement devices used in ultrasound exposimetry, attention has been focused on the high frequency response. However, current diagnostic ultrasound measurement standards have low frequency specifications for hydrophones and associated amplifiers, and the response below 1 MHz can be especially significant when measuring lithotripsy pulses. To model the effects o... View full abstract»

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  • On the subsample time delay estimation of narrowband ultrasonic echoes

    Publication Year: 1995, Page(s):993 - 1001
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (373 KB)

    Correlation based time delay estimators, optimal under certain conditions, exhibit the well-known threshold effect of poor performance at low signal-to-noise ratio (SNR). This sudden reduction in performance of the correlation based time delay estimators at low SNR arises from the misidentification of one unique "extremum" in very noisy conditions and from the peak fitting procedure in the case of... View full abstract»

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  • Parametric modeling and estimation of acoustic sediment properties using a system identification approach

    Publication Year: 1995, Page(s):1002 - 1008
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (403 KB)

    The acoustic properties of marine sediments are measured to obtain an acoustic signature of their mechanical characteristics. The proposed 1-D wave propagation model accounts for absorption and dispersion. Use is made of an inverse procedure based on a maximum likelihood estimator for obtaining a parametric identification of the sediments. Measurements are performed in the laboratory, in reflectio... View full abstract»

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  • Propagation of pure shear surface waves in magnetostrictive polycrystalline ferrites

    Publication Year: 1995, Page(s):1009 - 1011
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB)

    The launching and propagation of pure shear surface waves (SSW) in magnetostrictive polycrystalline ferrite were studied. The results show that SSW have lower sensitivity to surface quality than Rayleigh waves, but the launching effectiveness by a meander-type transducer is lower than for Rayleigh waves. The variation in phase velocity of SSW on a magnetic field was 4.5%, which can be of interest ... View full abstract»

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  • Remote detection of acoustic boundaries using radiation imaging operators

    Publication Year: 1995, Page(s):1012 - 1019
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1367 KB)

    In this paper, we present an acoustic imaging operator. This operator is based upon combining the material boundary conditions at an acoustic boundary and the radiation boundary conditions associated with one way wave propagation. Numerical examples, using the second-order imaging operator, are presented in order to demonstrate the applicability of this method to the detection of two-dimensional b... View full abstract»

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  • Second harmonic imaging and harmonic Doppler measurements with Albunex

    Publication Year: 1995, Page(s):1020 - 1027
    Cited by:  Papers (24)  |  Patents (42)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    Gaseous ultrasound contrast agents, such as Albunex, have been shown to be valuable clinically for the better identification of certain anatomic structures and for quantitating organ perfusion. However, the application of a contrast agent sometimes also reduces the image contrast between the blood and the surrounding tissues. This paper presents experimental results to show that this problem may b... View full abstract»

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  • VHF/UHF range bioultrasonic spectroscopy system and method

    Publication Year: 1995, Page(s):1028 - 1039
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1418 KB)

    A new system and method for characterizing biological tissues in vitro and liquids in the VHF and UHF ranges is described. Bulk acoustic properties such as the sound velocity, attenuation, acoustic impedance, and density are determined in reflection and transmission modes, with the biological tissue/liquid specimen sandwiched between the parallel surfaces of synthetic silica glass buffer rods havi... View full abstract»

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  • An explicit numerical time domain formulation to simulate pulsed pressure waves in viscous fluids exhibiting arbitrary frequency power law attenuation

    Publication Year: 1995, Page(s):1040 - 1049
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (609 KB)

    An explicit time domain algorithm is developed which is capable of numerically simulating pulsed pressure waves propagating through media whose attenuation increases with frequency according to a power law dependency. Because of possible noninteger exponents in the power law formulation, standard temporal differential operators cannot be defined and traditional finite difference approximations are... View full abstract»

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  • Bowtie limited diffraction beams for low-sidelobe and large depth of field imaging

    Publication Year: 1995, Page(s):1050 - 1063
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1471 KB)

    Limited diffraction beams such as Bessel beams and X waves have a large depth of field and thus could have many applications. However, these beams have higher sidelobes as compared to conventional focused beams in their focal planes. In this paper, a new class of limited diffraction beams is developed. These beams are termed bowtie limited diffraction beams because they have bowtie shapes in a pla... View full abstract»

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  • Higher order spectra based deconvolution of ultrasound images

    Publication Year: 1995, Page(s):1064 - 1075
    Cited by:  Papers (48)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1196 KB)

    We address the problem of improving the spatial resolution of ulrasound images through blind deconvolution. The ultrasound image formation process in the RF domain can be expressed as a spatio-temporal convolution between the tissue response and the ultrasonic system response, plus additive noise. Convolutional components of the dispersive attenuation and aberrations introduced by propagating thro... View full abstract»

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  • Multiple target detection using split spectrum processing and group delay moving entropy

    Publication Year: 1995, Page(s):1076 - 1086
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (799 KB)

    The split spectrum processing technique obtains a frequency-diverse ensemble of narrow-band signals through a filterbank then recombines them nonlinearly to improve target visibility. Although split spectrum processing is an effective method for suppressing grain noise in ultrasonic nondestructive testing, its application was mainly limited to the detection of single targets or multiple targets ha... View full abstract»

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  • Time reversal processing in ultrasonic nondestructive testing

    Publication Year: 1995, Page(s):1087 - 1098
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1829 KB)

    In this paper, we present a novel and completely different approach to focusing on defects beneath plane or curved surfaces: the time reversal mirror method. The time reversal technique is based on the concept of time reversal of ultrasonic fields and takes into account both the phase and modulus information coming from the defect. This technique is self-adaptative and requires only the presence o... View full abstract»

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  • An alternative method for suppressing undesired transverse modes in longitudinally coupled SAW resonator filters

    Publication Year: 1995, Page(s):1099 - 1101
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (303 KB)

    As known, perturbing transverse modes arising from the waveguide properties of the interdigital transducers and reflectors can appear in SAW resonator filters. Usually, these undesired modes are suppressed by transducer apodization. This method has the disadvantage of increasing the transducer impedance. We propose a longitudinally coupled resonator filter, the basic elements of which are able to ... View full abstract»

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  • Table of contents - Front cover

    Publication Year: 1995, Page(s): i
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    Freely Available from IEEE
  • [Inside front cover]

    Publication Year: 1995, Page(s): ii
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    Freely Available from IEEE
  • [Back inside cover]

    Publication Year: 1995, Page(s): iii
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  • Information for Contributors - Back Cover

    Publication Year: 1995, Page(s): iv
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    Freely Available from IEEE
  • Call for Papers - Special Issue on Finite Element Applications in Ultrasonics

    Publication Year: 1995, Page(s): 1102
    Request permission for commercial reuse | PDF file iconPDF (215 KB)
    Freely Available from IEEE
  • 1995 Index: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

    Publication Year: 1995, Page(s):1103 - 1118
    Request permission for commercial reuse | PDF file iconPDF (646 KB)
    Freely Available from IEEE
  • Call for Papers - ISAF '96

    Publication Year: 1995, Page(s):1119 - 1120
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    Freely Available from IEEE

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.

Full Aims & Scope

Meet Our Editors

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