Results 121 to 130 of about 799 (161)
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Electro-acoustical characterization procedure for cMUTs
Ultrasonics, 2005A procedure for the electro-acoustical characterization in air of cMUTs is reported. First, the measured input electrical impedance of the transducer is used to calculate the transducer parameters at different bias voltages by fitting it with the Mason model. Then, the single membrane equivalent circuit can be calculated.
Marta, Buigas +5 more
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Analysis and design of dual-electrode CMUTs
IEEE Ultrasonics Symposium, 2005., 2006Dual-electrode CMUTs are analyzed using analytical and finite element methods. The analysis results that show improved transmit and receive performance are verified by experiments. We conducted experiments to investigate the effect of side electrode biasing on both the magnitude and the frequency spectrum of the received signals.
BALANTEKİN, MÜJDAT +2 more
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Pull-in Analysis of CMUT Elements
2020 IEEE International Ultrasonics Symposium (IUS), 2020This paper presents a novel characterization method for the pull-in voltage of a Capacitive Micromachined Ultrasonic Transducer (CMUT) element. The presented method allows pull-in estimation of all CMUT cells contained in an element, which is in contrast to conventional methods that only allows for a pull-in average across an element.
Havreland, Andreas Spandet +3 more
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A finite difference model For cMUT devices
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2005A finite difference method was implemented to simulate capacitive micromachined ultrasonic transducers (cMUTs) and compared to models described in the literature such as finite element methods. Similar results were obtained. It was found that one master curve described the clamped capacitance. We introduced normalized capacitance versus normalized bias
Dominique, Certon +2 more
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Multifrequency Interlaced CMUTs for Photoacoustic Imaging
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2017Multifrequency capacitive micromachined ultrasound transducers (CMUTs) are introduced consisting of interlaced 82- [Formula: see text] (low frequency) and 36- [Formula: see text] (high frequency) membranes. The membranes have been interlaced on a scale smaller than the shortest wavelength of operation allowing several advantages over other ...
Ryan K W, Chee +3 more
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IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2005
A method for analyzing capacitive micromachined ultrasonic transducer (CMUT) arrays and arrays of elements composed of several CMUTs is proposed. It is based on a combination of a free acoustic mode description of an isolated CMUT, and the coupling of these modes to the fluid in which waves should be excited or detected through an impedance matrix that
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A method for analyzing capacitive micromachined ultrasonic transducer (CMUT) arrays and arrays of elements composed of several CMUTs is proposed. It is based on a combination of a free acoustic mode description of an isolated CMUT, and the coupling of these modes to the fluid in which waves should be excited or detected through an impedance matrix that
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Echographic Images Improvements with a CMUT Probe
2007The validity of cMUT (capacitive Micromachined Ultrasonic Transducer) technology for medical imaging applications has been proved by many authors. The large bandwidth obtained with cMUT leads to improved image resolution compared to their piezoelectric counterpart. Recently, our laboratory (Aculab) has developed a flexible cMUT technology (the “Reverse”
CALIANO, Giosue' +5 more
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Fabrication and Integration of CMUT Sensors
2017Capacitive micromachined ultrasound transducers (CMUTs) are a promising replacement technology for piezoelectric composite transducers, as they offer a more flexible architecture, wider signal bandwidth, and improved impedance matching between the sensor and the sensing medium.
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IEEE transactions on ultrasonics, ferroelectrics, and frequency control, 2006
A method for analyzing capacitive micromachined ultrasonic transducer (CMUT) arrays and arrays of elements composed of several CMUTs is proposed. It is based on a combination of a free acoustic mode description of an isolated CMUT, and the coupling of these modes to the fluid in which waves should be excited or detected through an impedance matrix that
openaire +1 more source
A method for analyzing capacitive micromachined ultrasonic transducer (CMUT) arrays and arrays of elements composed of several CMUTs is proposed. It is based on a combination of a free acoustic mode description of an isolated CMUT, and the coupling of these modes to the fluid in which waves should be excited or detected through an impedance matrix that
openaire +1 more source