Search

Now showing items 1-10 of 15

Circuit theoretical method for efficient finite element analysis of acoustical problems

Ekinci, A. Suat; Atalar, Abdullah (IEEE, 1998)

In the last decade, there has been an outstanding improvement in the computer aided design tools for VLSI circuits regarding solution times and the circuit complexity. This study proposes formulating the acoustic field ...

An equivalent circuit for collapse operation mode of CMUTs

Olcum, Selim; Yamaner F.Y.; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2010)

Collapse mode of operation of the capacitive mi-cromachined ultrasonic transducers (CMUTs) was shown to be a very effective way for achieving high output pressures. However, no accurate model exists for understanding the ...

Wafer bonded capacitive micromachined underwater transducers

Olcum, Selim; Oǧuz, Kaan; Şenlik, Muhammed N.; Yamaner F. Y.; Bozkurt, A.; Atalar, Abdullah; Köymen, Hayrettin (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 ...

A novel equivalent circuit model for CMUTs

Oğuz, H. Kağan; Olcum, Selim; Senlik, Muhammed N.; Atalar, Abdullah; Köymen, Hayrettin (IEEE, 2009-09)

A nonlinear equivalent circuit for immersed transmitting capacitive micromachined ultrasonic transducers (CMUTs) is presented. The velocity profile across the CMUT surface maintains the same form over a wide frequency ...

Deep-collapse operation of capacitive micromachined ultrasonic transducers

Olcum, S.; Yamaner F. Y.; Bozkurt, A.; Atalar, Abdullah (IEEE, 2011)

Capacitive micromachined ultrasonic transducers (CMUTs) have been introduced as a promising technology for ultrasound imaging and therapeutic ultrasound applications which require high transmitted pressures for increased ...

Modeling the effect of subsurface interface defects on contact stiffness for ultrasonic atomic force microscopy

Sarioglu, A. F.; Atalar, Abdullah; Degertekin, F. L. (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 ...

A new detection method for capacitive micromachine ultrasonic transducers

Ergun, A. S.; Temelkuran, B.; Özbay, Ekmel; Atalar, Abdullah (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 ...

Lumped element modeling of CMUT arrays in collapsed mode

Aydoğdu, Elif; Özgürlük, A.; Atalar, Abdullah; Köymen, Hayrettin (IEEE, 2014-09)

This study focuses on modeling collapsed modeoperation of CMUT arrays, and obtaining a small signal lumped element model for collapsed mode operation. Having the large signal model for single CMUT from previous studies, ...

Radiation impedance and equivalent circuit for immersed CMUT array element

Şenlik, Muhammed N.; Atalar, Abdullah; Köymen, Hayrettin; Olcum, Selim (IEEE, 2006-10)

In this paper, we present equivalent circuit for immersed capacitive micromachined ultrasonic transducers (cMUT), based on an accurate parametric model. We also present an accurate approximation for the radiation impedance ...

Optimizing CMUT geometry for high power

Yamaner F.Y.; Olcum, Selim; Bozkurt, A.; Köymen, Hayrettin; Atalar, Abdullah (IEEE, 2010)

Capacitive micromachined ultrasonic transducers (CMUTs) have demonstratedvarious advantages over piezoelectric transducers. However, current CMUT designsproduce low output pressures with high harmonic distortions. Optimizing ...