Download or read book Design Fabrication and Characterization of High Frequency Ultrasound Transducers written by Nithin Jose and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Fabrication and Characterization of Ultrasound Transducers and Arrays for Biomedical Imaging and Therapy written by Huaiyu Wu and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flexible Two dimensional Ultrasonic Transducer Array written by Vishal Kulkarni and published by . This book was released on 2012 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Design Fabrication and Characterization of Capacitive Micromachined Ultrasonic Transducers for Imaging Applications written by Andrew Stephan Logan and published by . This book was released on 2010 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Capacitive micromachined ultrasonic transducers (CMUTs) have proven themselves to be excellent candidates for medical ultrasonic imaging applications. The use of semiconductor fabrication techniques facilitates the fabrication of high quality arrays of uniform cells and elements, broad acoustic bandwidth, the potential to integrate the transducers with the necessary electronics, and the opportunity to exploit the benefits of batch fabrication. In this thesis, the design, fabrication and testing of one- and two-dimensional CMUT arrays using a novel wafer bonding process whereby the membrane and the insulation layer are both silicon nitride is reported. A user-grown insulating membrane layer avoids the need for expensive SOI wafers, permits optimization of the electrode size, and allows more freedom in selecting the membrane thickness, while also enjoying the benefits of wafer bonding fabrication. Using a row-column addressing scheme for an NxN two-dimensional array permits three-dimensional imaging with a large reduction in the complexity of the array when compared to a conventional 2D array with connections to all N2 elements. Only 2N connections are required and the image acquisition rate has the potential to be greatly increased. A simplification of the device at the imaging end will facilitate the integration of a three-dimensional imaging CMUT array into either an endoscope or catheter which is the ultimate purpose of this research project. To date, many sizes of transducers which operate at different frequencies have been successfully fabricated. Initial characterization in terms of resonant frequency and, transmission and reception in immersion has been performed on most of the device types. Extensive characterization has been performed with a linear 32 element array transducer and a 32x32 element row-column transducer. Two- and three-dimensional phased array imaging has been demonstrated.
Download or read book Design Fabrication and Characterization of Ultrasound Transducers for Fragmenting Large Renal Calculi written by Akshay P. Randad and published by . This book was released on 2018 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: One in 11 people is affected by renal calculi (kidney stones) at some point in their life. There are different stone management techniques, but all have associated injuries to kidney or ureter and complications. Burst wave lithotripsy (BWL), developed recently by the Center for Industrial and Medical Ultrasound, has shown promising results for fragmenting stone non-invasively. BWL targets a stone with a series of pulses of small pressure amplitude at regular intervals of time to break the stone while minimizing tissue damage. BWL is still under development and its parameters need to be optimized. One of the challenges of BWL is to develop a transducer that can fragment stones larger than 6 mm. The objective of this work was to develop a transducer that fragmented stones up to 12 mm. This was achieved by using piezoceramic materials that produced sufficient power for the fragmentation of large stones. Acoustic beam patterns were optimized using an iterative angular spectrum approach and rapid prototyped acoustic lenses. Finally, a BWL transducer was designed, fabricated and characterized to confirm the required outputs. The new transducer was demonstrated to fragment 11 mm stones 2.8 times more effectively than existing BWL transducers.
Download or read book Capacitive Micromachined Ultrasonic Transducers written by Dilruba Zaman Jeba and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Capacitive micromachined ultrasonic transducers (CMUTs) have been developed as an alternative to piezoelectric transducers for ultrasonic imaging in non-destructive testing applications. These CMUTs offer substantial advantages over their piezoelectric counterparts, which include a highly miniaturized system, easy integration with electronic control circuitry, a wider bandwidth, and a higher sensitivity. In this thesis, the design, fabrication and characterization of several single and array CMUT devices are reported. Many sizes of CMUTs, aiming to operate at different resonant frequencies, were fabricated using a PolyMUMPs sacrificial technique. An analytical and finite element model was used to further understanding of the physical behaviour of the transducer. The basic functionality of the CMUT devices was investigated through capacitance and electrical impedance measurements. These devices showed greater change in the capacitance and impedance data while operating close to their collapse voltages. This higher change in both capacitance and impedance is a result of a larger membrane displacement. The acoustic output power is directly related to the magnitude of the membrane's displacement. The transducers performance thus can be enhanced by operating close to their collapse voltage and obtained higher sensitivity. The optical characterization, performed on the single devices and on the 1-D arrays, provided a better understanding of the membrane vibration modes and displacement profiles at different resonant frequency modes. Acoustic measurements were performed to demonstrate the transmission capability of the CMUTs. The generated acoustic signals were detected using a commercial detector. These acoustic experiments demonstrated that these CMUTs can potentially be used as ultrasonic transducers alternative to piezoelectric transducers.
Download or read book Design Fabrication and Characterization of Micromachined Piezoelectric T beam Transducers written by Zheqian Zhang and published by . This book was released on 2010 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Fabrication and Analysis of a Micromachined Ultrasonic Transducer written by Michael George Pollack and published by . This book was released on 1998 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fabrication and Characterisation of High Frequency Ultrasound Transducers written by and published by . This book was released on 2007 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MEMS Materials and Processes Handbook written by Reza Ghodssi and published by Springer Science & Business Media. This book was released on 2011-03-18 with total page 1211 pages. Available in PDF, EPUB and Kindle. Book excerpt: MEMs Materials and Processes Handbook" is a comprehensive reference for researchers searching for new materials, properties of known materials, or specific processes available for MEMS fabrication. The content is separated into distinct sections on "Materials" and "Processes". The extensive Material Selection Guide" and a "Material Database" guides the reader through the selection of appropriate materials for the required task at hand. The "Processes" section of the book is organized as a catalog of various microfabrication processes, each with a brief introduction to the technology, as well as examples of common uses in MEMs.
Download or read book Fabrication and Characterization of a Radial Ultrasonic Transducer written by X. Yuan and published by . This book was released on 2016 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new type of radial ultrasonic transducer was fabricated in this study. The performances of five radial ultrasonic transducers of different thickness were investigated in this paper. It was found that the radial ultrasonic transducers possess the greatest sensitivity when the matching layer thickness is 2.5 mm. The addition of tungsten powder in the backing layer could effectively absorb noise, which improved the acoustic attenuation performance of the backing layer and their sensitivity. To study the directivity, the ultrasonic transducer was put into water. It was found that the transducer could achieve transmitting ultrasound in all radial directions and the ultrasonic signal is similar along all radial directions, i.e., the transducer exhibits isotropic properties, which makes it a good candidate for nondestructive testing of concrete when embedded in concrete elements and structures.
Download or read book Biomedical Technology Resources written by and published by . This book was released on 2001 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Piezoelectric and Acoustic Materials for Transducer Applications written by Ahmad Safari and published by Springer. This book was released on 2010-11-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book discusses the underlying physical principles of piezoelectric materials, important properties of ferroelectric/piezoelectric materials used in today’s transducer technology, and the principles used in transducer design. It provides examples of a wide range of applications of such materials along with the appertaining rationales. With contributions from distinguished researchers, this is a comprehensive reference on all the pertinent aspects of piezoelectric materials.
Download or read book Piezoelectric and Acoustic Materials for Transducer Applications written by Ahmad Safari and published by Springer Science & Business Media. This book was released on 2008-09-11 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book discusses the underlying physical principles of piezoelectric materials, important properties of ferroelectric/piezoelectric materials used in today’s transducer technology, and the principles used in transducer design. It provides examples of a wide range of applications of such materials along with the appertaining rationales. With contributions from distinguished researchers, this is a comprehensive reference on all the pertinent aspects of piezoelectric materials.
Download or read book Physical Ultrasonics of Composites written by Stanislav Rokhlin and published by Oxford University Press, USA. This book was released on 2011-03-03 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to treat the behavior of ultrasonic waves as they interact with layered, anisotropic materials incorporating those structural aspects unique to composite laminates addressing both experimental and modeling methodologies. Anisotropic material interfaces, guided waves, waves in layered media and laminated plates are treated. The influence of finite-aperture transducers on electronic signals and the field of air-coupled ultrasonics end the work.
Download or read book Diagnostic Ultrasound written by K. Kirk Shung and published by CRC Press. This book was released on 2005-09-19 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasound imaging is one of the most important and widely used diagnostic tools in modern medicine, second only to the conventional x-ray. Although considered a mature field, research continues for improving the capabilities and finding new uses for ultrasound technology while driving down the cost of newer, more complicated procedures such as int
Download or read book High Frequency Piezo Composite Micromachined Ultrasound Transducer Array Technology for Biomedical Imaging written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
