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Now showing items 31-40 of 164
A backscattering formula for acoustic transducers
(A I P Publishing, 1980-06)
A backscattering formula for a single transducer geometry is derived. It expresses the output voltage of the transducer in terms of the angular spectra of scalar and vector acoustic potentials on a plane. The formulation ...
Force spectroscopy using bimodal frequency modulation atomic force microscopy
(American Physical Society, 2011-02-15)
We propose a force-spectroscopy technique where a higher order mode of a cantilever is excited simultaneously with the first. Resonance tracking of both vibration modes through a frequency modulation scheme provides a way ...
Design and implementation of a general-purpose median filter unit in CMOS VLSI
(IEEE Solid-State Circuits Society, 1990)
A general-purpose median filter unit configuration is proposed in the form of two single-chip median filters, one extensible and one real-time. The networks of the chips are pipelined and systolic at bit level and based ...
Nonlinear equivalent circuit model for circular CMUTs in uncollapsed and collapsed mode
(IEEE, 2012)
An equivalent electrical circuit model valid for collapsed mode operation of CMUT is described. The across and through variables of the circuit model are chosen to be rms force and rms displacement over the surface of the ...
Radiation impedance of collapsed capacitive micromachined ultrasonic transducers
(Institute of Electrical and Electronics Engineers, 2012)
The radiation impedance of a capacitive micromachined ultrasonic transducer (CMUT) array is a critical parameter to achieve high performance. In this paper, we present a calculation of the radiation impedance of collapsed, ...
Wafer bonded capacitive micromachined underwater transducers
(IEEE, 2009-09)
In this work we have designed, fabricated and tested CMUTs as underwater transducers. Single CMUT membranes with three different radii and 380 microns of thickness are fabricated for the demonstration of an underwater CMUT ...
Transmitting CMUT arrays without a DC bias
(IEEE Computer Society, 2019)
This study focuses on design, simulation, fabrication and measurement of transmitting CMUT arrays with unbiased mode of operation. We presented a design procedure considering the radiation pattern, Rayleigh distance and ...
A synthetic aperture imaging system using surface wave modes
(IEEE, 1995)
A synthetic aperture acoustic imaging system with a novel inversion algorithm is described. Data is obtained by using a transducer insonifying the sample surface at a critical angle which is excited by a short electrical ...
Use of a conical axicon as a surface acoustic wave focusing device
(IEEE, 1987-01)
Ultrasonic axicons generate waves which focus on a line.
They are used in various imaging applications as hulk wave focusing
devices with a very long depth of focus. A new type of conical axicon
is introduced. It consists ...
Binary sequences with low aperiodic autocorrelation for synchronization purposes
(IEEE, 2003)
An evolutionary algorithm is used to find three sets of binary sequences of length 49-100 suitable for the synchronization of digital communication systems. Optimization of the sets are done by taking into consideration ...