Search

Your search keyword '"Lukacs, Marc"' showing total 19 results
Start Over Author "Lukacs, Marc"
19 results on '"Lukacs, Marc"'

2. Performance and characterization of new micromachined high-frequency linear arrays

Author

Lukacs, Marc, Jianhua Yin, Guofeng Pang, Garcia, Richard C., Cherin, Emmanuel, Williams, Ross, Mehi, Jim, and Foster, F. Stuart

Subjects
Finite element method -- Usage, Transducers -- Design and construction, Integrated circuit fabrication -- Methods, Integrated circuit fabrication, Business, Electronics, Electronics and electrical industries
Abstract

A new approach is developed for fabricating high frequency linear array transducers, based on laser micromachining. These devices have the potential of extending the frequency range of transducers, as they are not limited by the integrity of a ceramic grain structure, and this technology has offered the advantages of batch fabrication at the expense of setting up, or gaining access to, a full microfabrication facility.

Published
2006

4. Thickness mode material constants of a supported piezoelectric film

Author

Lukacs, Marc, Olding, Tim, Sayer, Michael, Tasker, Ron, and Sherit, Stewart

Subjects
Thickness measurement -- Research, Piezoelectric materials -- Research, Thin films -- Research, Physics
Abstract

A nondestructive technique for the measurement of the true thickness mode material constants of a piezoelectric film using complex impedance measurements within the frequency range of 0-500 MHz was described. It had been used to assess a lead zirconium titanate sol gel composite ceramic. It was found that the technique can be applied in conjunction with microelectromechanical system applications to produce more accurate device simulation.

Published
1999

11. Multi-Element Transducers For Conformal Transurethral Thermal Therapy.

Author

Baker, Nicole, Desouza, Alexander, Jianhua Yin, Boyes, Aaron, Lukacs, Marc, Chopra, Rajiv, Foster, Stuart, and Bronskill, Michael

Subjects
PROSTATE, THERAPEUTICS, CLINICAL medicine, MEDICAL imaging systems, MEDICAL equipment, DIAGNOSTIC imaging, MEDICAL photography
Abstract

Transurethral thermal therapy of the prostate using ultrasound may be used to create a thermal lesion that matches a target volume of tissue while sparing surrounding structures. To produce multiple-element ultrasound transducers for this purpose, a fabrication method of sub-dicing one continuous piece of piezoceramic to isolate individual elements was employed. Finite element modeling was used to determine the required dicing cut width and depth for adequate inter-element isolation. Experimental acoustic measurements were used to evaluate device efficiency and power stability over a range of element widths (2 to 4 mm) and lengths (3 to 30 mm). Efficiencies of 50% or higher and power output suitable for thermal therapy were achievable for all element sizes tested. This method of fabrication and testing is being utilized for evaluation of prototype devices designed for prostate thermal therapy. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
Full Text
View/download PDF

17. Single Element High Frequency (<50 MHz) PZT Sol Gel Composite Ultrasound Transducers.

Author

Lukacs, Marc and Sayer, Michael

Subjects
*COLLOIDS, *TRANSDUCERS, *ANALYTICAL chemistry
Abstract

Presents information on a study which examined a sol gel composite processing sequence. Sol gel composite material; Transducer fabrication and characteristics; Acceptance gained by ultrasound biomicroscopy as a clinical tool for the examination of the anterior segment of the eye.

Published
2000
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results