Experimental Confirmation of Non-Positive Refraction in the Passing Band of a Phononic Crystal

Persistent Link:
http://hdl.handle.net/10150/244777
Title:
Experimental Confirmation of Non-Positive Refraction in the Passing Band of a Phononic Crystal
Author:
Schulter, Joshua Daniel
Issue Date:
May-2012
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A sonic crystal composed of open ended copper pipes mounted in plastic in open air is found to non-positively refract sound of frequency approximately 10.05 kHz incident at approximately 23.3°. This is confirmation of the predicted refractive properties of such crystals upon incident sound with frequencies within their passing bands at certain angles of incidence. The measurements were obtained by examining the spectra of sound obtained from a microphone whose position was varied relative to a speaker apparatus projecting a pure sine wave created by a function generator, with and without the crystal in the way. The horizontal shift in the profile of sound due to the crystal was then examined and it was concluded that the crystal did not positively refract it, considering it to be acting as a flat lens. Furthermore, it is confirmed that such a crystal causes incident sound to undergo minimal distortion to its profile by observing that a collimated beam incident upon the crystal results in approximately the same profile as output.
Type:
text; Electronic Thesis
Degree Name:
B.S.
Degree Level:
bachelors
Degree Program:
Honors College; Physics
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleExperimental Confirmation of Non-Positive Refraction in the Passing Band of a Phononic Crystalen_US
dc.creatorSchulter, Joshua Danielen_US
dc.contributor.authorSchulter, Joshua Danielen_US
dc.date.issued2012-05-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA sonic crystal composed of open ended copper pipes mounted in plastic in open air is found to non-positively refract sound of frequency approximately 10.05 kHz incident at approximately 23.3°. This is confirmation of the predicted refractive properties of such crystals upon incident sound with frequencies within their passing bands at certain angles of incidence. The measurements were obtained by examining the spectra of sound obtained from a microphone whose position was varied relative to a speaker apparatus projecting a pure sine wave created by a function generator, with and without the crystal in the way. The horizontal shift in the profile of sound due to the crystal was then examined and it was concluded that the crystal did not positively refract it, considering it to be acting as a flat lens. Furthermore, it is confirmed that such a crystal causes incident sound to undergo minimal distortion to its profile by observing that a collimated beam incident upon the crystal results in approximately the same profile as output.en_US
dc.typetexten_US
dc.typeElectronic Thesisen_US
thesis.degree.nameB.S.en_US
thesis.degree.levelbachelorsen_US
thesis.degree.disciplineHonors Collegeen_US
thesis.degree.disciplinePhysicsen_US
thesis.degree.grantorUniversity of Arizonaen_US
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