Focused ultrasounds are used for a wide range of medical applications from deep implant powering (where the acoustic transducers are placed outside of the body and steer toward an implant harvesting the acoustic energy) to non-invasive surgical technology (that uses ultrasound energy to target specific areas of the brain and body for treatments).
In order to generate this acoustic power, microscale piezoelectric transducers are fabricated in large arrays with the potential to control the time delay of every single transducer. Beam-forming techniques is then used to focus the pressure on small spots in space at which the high pressure can then be used for the electronic powering or the tissue stimulation.
The left figure above illustrates the principle of a focused pressure beam: the individual transducers are actuated with a time delay calculated such that the pressure is focused on a narrow spot in space, where the pressure is therefore much stronger. The right figure illustrates the acoustic stimulation of mouse tissues while monitoring its reactions.
Based on the available PMUT, technology this master thesis explores the available beam forming strategies to maximize the focused pressure and control the focus spot. Following a thorough literature study and simulations, the proposed solutions will be implemented and tested in water.
Type of project: Thesis
Duration: 6-12 months
Required degree: Master of Engineering Technology, Master of Science, Master of Engineering Science
Required background: Mechanical Engineering, Nanoscience & Nanotechnology, Electrotechnics/Electrical Engineering, Electromechanical engineering, Computer Science