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Now showing items 61-70 of 146
Modeling the effect of subsurface interface defects on contact stiffness for ultrasonic atomic force microscopy
(AIP Publishing LLC, 2004)
We present a model predicting the effects of mechanical defects at layer interfaces on the contact
stiffness measured by ultrasonic atomic force microscopy sAFMd. Defects at subsurface interfaces
result in changes at the ...
Resonant harmonic response in tapping-mode atomic force microscopy
(American Physical Society, 2004)
Higher harmonics in tapping-mode atomic force microscopy offers the potential for imaging and sensing material properties at the nanoscale. The signal level at a given harmonic of the fundamental mode can be enhanced if ...
A new detection method for capacitive micromachine ultrasonic transducers
(IEEE, 2001)
Capacitive micromachine ultrasonic transducers (cMUT) have become an alternative to piezoelectric transducers in the past few years. They consist of many small circular membranes that are connected in parallel. In this ...
Rayleigh-bloch waves in CMUT arrays
(Institute of Electrical and Electronics Engineers Inc., 2014)
Using the small-signal electrical equivalent circuit of a capacitive micromachined ultrasonic transducer (CMUT) cell, along with the self and mutual radiation impedances of such cells, we present a computationally efficient ...
Simulation of higher harmonics generation in tapping-mode atomic force microscopy
(American Institute of Physics, 2001)
In tapping-mode atomic force microscopy, nonlinear tip-sample interactions give rise to higher harmonics of the cantilever vibration. We present an electrical circuit to model the atomic force microscope cantilever with ...
Designing circular CMUT cells using CMUT biasing chart
(IEEE, 2012-10)
A very accurate equivalent circuit model for circular CMUT cell is recently proposed. As a consequence of this model, the operating characteristics of the cell is derived and presented as a biasing chart for CMUTs. We ...
Lumped element model of single CMUT in collapsed mode
(IEEE, 2013)
In this study, an equivalent electrical circuit model for a single circular CMUT in both uncollapsed and collapsed modes is obtained. In order to model the collapsed mode mechanics, the governing differential equation is ...
Resonances and nonuniformities in CMUT elements or arrays
(IEEE, 2014-09)
We determine the response of individual cells of a CMUT array immersed in water using the small-signal equivalent circuit of a single cell and radiation impedances. Using a numerically efficient technique, we are able to ...
Electrically unbiased driven airborne capacitive micromachined ultrasonic transducer design
(IEEE, 2012)
We present a design method for airborne capacitive micromachined ultrasonic transducers (CMUT). We use an equivalent lumped element circuit to model both electrical and mechanical properties of CMUT and analyze it in ...
Designing an efficient wide bandwidth single cell CMUT for airborne applications using nonlinear effects
(IEEE, 2013)
In this work, we propose a new approach to obtain wider bandwidth for an airborne capacitive micromachined ultrasonic transducer (CMUT) cell without sacrificing sensitivity. This is done through employing the stiffening ...