Abstract

Acoustic levitation utilizes general principles of ultrasonics to trap particles in midair without external support. This is done by creating an array of ultrasonic transducers to propagate sound waves to a focused point in space. In order to optimize the particle trap it is necessary to design transducers that can produce enough sound to create pressure pockets. In this work I examine the fundamental principles of acoustics by testing the sound pressure levels (SPL) of a known transducer in both air and water mediums. A comparison between domed and bimorphed transducers are also examined. Experimentation was performed on the feasibility of implementing a domed transducer array. Methods are described to fabricate a piezoelectric thin film made from poly(vinylidene difluoride) (PVDF). These films were analyzed for β-phase concentration, as well as transmission, resolution, and contrast. An additional study into the use of Indium Tin Oxide (ITO) as a conductive dielectric layer of a transducer is also examined. These studies are designed to test if spin coating can provide the necessary conditions to fabricate transparent, piezoelectric PVDF films. Included are the research and experiments that I conducted to determine the transparency of PVDF. I performed analysis on the transmission, absorption, and scatter of fabricated PVDF films. My results show that it is possible to fabricate PVDF films that are both transparent and piezoelectric.

Degree

College and Department

Ira A. Fulton College of Engineering; Electrical and Computer Engineering

Rights

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