Blar i Institutt for mikrosystemer på tidsskrift "Proceedings - IEEE Ultrasonics Symposium"
Viser treff 1-9 av 9
-
Acoustic Characterization of Inhomogenous Layers using Finite Element Method
(Peer reviewed; Journal article, 2021)This study presents a finite element approach to estimate acoustic parameters of layers of arbitrary compositions using 2D and 3D models. In this approach the resonance frequency of a layer to be investigated is found by ... -
Acoustic Impedance Matching of PMN-PT/epoxy 1-3 Composites for Underwater Transducers with Usable Bandwidth Restricted by Electrical Power Factor
(Peer reviewed; Journal article, 2019)Volume cost has limited the use of single crystals in underwater applications, butreported performance of PMN-PT sonar transducers now motivates the design of commercial prototypes. This work addresses optimization of the ... -
Electrical power factor for a single crystal tonpilz versus a plate with matching layers
(Peer reviewed; Journal article, 2021)For underwater transducers mounted on small platforms, reactive electrical power can constitute a main restriction on the usable frequency range. The frequency range in which the amount of reactive power is acceptable can ... -
Increased Usable Frequency Band for Underwater Transducers with Single Crystal
(Peer reviewed; Journal article, 2020)In the increasing market of transducers for small underwater platforms, each transducer should be used for several purposes, hence cover as large frequency range as possible. Bandwidth is commonly defined as the -3dB limit ... -
Intermetallic bonding as an alternative to polymeric adhesives in ultrasound transducers
(Peer reviewed; Journal article, 2019)Common ultrasound transducers utilize epoxy for bonding the active piezoelectric to the rest of the acoustic stack. This paper explores some of the potential benefits of replacing this soft epoxy layer with a harder ... -
Nonlinear electrical impedance of the acoustic stack in cardiac ultrasound probe
(Peer reviewed; Journal article, 2020)Understanding the nonlinearity in ultrasound probes is important for tissue harmonic imaging, as 2nd harmonic components transmitted from the probe may interfere with harmonics from the tissue and degrade the image quality. ... -
Reduction of transmitted 2nd harmonics using an adaptive method by simulated annealing
(Peer reviewed; Journal article, 2017)Second harmonic imaging relies on the double the transmit frequency being generated as the waves propagate into the tissue. The method requires good control over the transmit system, to suppress 2 nd harmonics transmitted ... -
Sources of 2nd harmonic generation in a medical ultrasound probe
(Peer reviewed; Journal article, 2018)Tissue harmonic imaging is often the preferred ultrasound imaging modality due to its ability to suppress reverberations. The method requires good control on the transmit stage of the ultrasound scanner, as harmonics in ... -
Ultrasound Transducers for High Pressure Environments Up to 1000 Bar
(Peer reviewed; Journal article, 2020)This paper studies the influence of high ambient pressure on ultrasound transducers where the piezoelectric layer is bonded to the acoustic matching layer by two different methods: Au-Sn solid-liquid interdiffusion and ...