IEEE Ultrasonics Ferroelectrics and Freq Control

  • Tests of a Noncontact Piezoelectric Motor Modulated by an Electromagnetic Field
    Posted on January 1, 2020 at 12:00 am

    For improving the service life of piezoelectric motors and the performance of noncontact piezoelectric motors, a novel noncontact piezoelectric motor modulated by the electromagnetic field is proposed. This type of piezoelectric motor uses an electromagnetic field to modulate the reciprocating vibrations of a piezoelectric drive mechanism to form the step motion of the rotor. The working […]

  • Domain Switching by Electron Beam Irradiation in SBN61:Ce Single Crystals Covered by Dielectric Layer
    Posted on January 1, 2020 at 12:00 am

    The formation of the domain structure by electron beam irradiation in thermally depolarized Ce-doped strontium barium niobate single crystals with free surface and surface covered by a dielectric layer has been studied. The dependences of the domain sizes and domain depth on the irradiated dose have been measured. The circular shape of the isolated domains was obtained. The isotropic domain […]

  • IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    Posted on January 1, 2020 at 12:00 am

    Provides a listing of current staff, committee members and society officers. […]

  • Stress Measurement of a Pressurized Vessel Using Ultrasonic Subsurface Longitudinal Wave With 1–3 Composite Transducers
    Posted on January 1, 2020 at 12:00 am

    This article aims to develop a stress-sensing method for a pressurized vessel based on subsurface longitudinal (SSL) waves confined in a specific waveform by using 1–3 composite transducers. Although ultrasonic SSL waves have been commonly utilized for stress sensing, wave excitation under the predefined function using the composite-type transmitter is not well studied. In this article, […]

  • Table of contents
    Posted on January 1, 2020 at 12:00 am

    Presents the table of contents for this issue of this publication. […]

  • [Front cover]
    Posted on January 1, 2020 at 12:00 am

    Presents the front cover for this issue of the publication. […]

  • Data-Adaptive 2-D Tracking Doppler for High-Resolution Spectral Estimation
    Posted on January 1, 2020 at 12:00 am

    Spectral broadening in pulsed-wave Doppler caused by the transit-time effect deteriorates the frequency resolution and may cause overestimation of maximum velocities in high-velocity blood flow regions and for large beam-to-flow angles. Data-adaptive spectral estimators have been shown to provide improved frequency resolution, especially for small ensemble lengths, but offer little or no […]

  • Enhancement of Acoustic Microscopy Lateral Resolution: A Comparison Between Deep Learning and Two Deconvolution Methods
    Posted on January 1, 2020 at 12:00 am

    Scanning acoustic microscopy (SAM) provides high-resolution images of biological tissues. Since higher transducer frequencies limit penetration depth, image resolution enhancement techniques could help in maintaining sufficient lateral resolution without sacrificing penetration depth. Compared with existing SAM research, this work introduces two novelties. First, deep learning (DL) is used to […]

  • Impact of Bit Errors in Digitized RF Data on Ultrasound Image Quality
    Posted on January 1, 2020 at 12:00 am

    This article quantitatively analyzes the impact of bit errors in digitized RF data on ultrasound image quality. The quality of B-mode images in both linear array and phased array imaging is evaluated by means of three objective image quality metrics: peak signal-to-noise ratio, structural similarity index, and contrast-to-noise ratio, when bit errors are introduced to the RF data with different […]

  • Redatuming of 2-D Wave Fields Measured on an Arbitrary-Shaped Closed Aperture
    Posted on January 1, 2020 at 12:00 am

    Whole-breast ultrasound scanning systems are used to screen a women’s breast for suspicious lesions. Typically, the transducers are located at fixed positions at relatively large distances from the breast to avoid any contact with the breast. Unfortunately, these large distances give rise to large spatial domains to be imaged. These large domains hamper the applicability of imaging by […]

  • Super-Resolution Imaging Through the Human Skull
    Posted on January 1, 2020 at 12:00 am

    High-resolution transcranial ultrasound imaging in humans has been a persistent challenge for ultrasound due to the imaging degradation effects from aberration and reverberation. These mechanisms depend strongly on skull morphology and have high variability across individuals. Here, we demonstrate the feasibility of human transcranial super-resolution imaging using a geometrical focusing approach […]

  • Long-Term Stability Analysis Toward &#x003C;10<sup>&#x2212;14</sup> Level for a Highly Compact POP Rb Cell Atomic Clock
    Posted on January 1, 2020 at 12:00 am

    Long-term frequency instabilities in vapor-cell clocks mainly arise from fluctuations of the experimental and environmental parameters that are converted to clock frequency fluctuations via various physical processes. Here, we discuss the frequency sensitivities and the resulting stability limitations at one-day timescale for a rubidium vapor-cell clock based on a compact magnetron-type cavity […]