Class Year

2018

Date

4-25-2018

Document Type

Thesis

Distinguished Thesis

Yes

Degree Name

Bachelor of Arts (BA)

Department or Program

Physics

First Advisor

R. Scott Schappe

Second Advisor

Nathan Mueggenburg

Third Advisor

Enrique Treviño

Fourth Advisor

Michael M. Kash

Abstract

In this experiment we investigated the behavior of a 40W commercial, ultrasonic transducer. We observed a frequency response hysteresis near the resonant frequency of 28 kHz and determined that the resonant frequency depends on temperature and driving amplitude. We then used the transducer to create a resonant standing wave to levitate small objects including water drops. We show the non-linear acoustical theory to support the acoustic levitation force being produced by a nonzero time-average pressure. Using Schlieren optics we were able to observe pressure variations and measured relative pressures using a microphone. From the dynamical behavior of a levitated object, we were able to estimate the pressure amplitude of the standing wave.

Language

English


Included in

Physics Commons

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