Title:
Measurement of Material Q in Rayleigh Waves with a Laser Based Acoustic Spectrometer

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dc.contributor.advisor Hunt, William D.
dc.contributor.author Massey, Eric William en_US
dc.contributor.committeeMember Ali Adibi
dc.contributor.committeeMember Steve Kenney
dc.contributor.department Electrical and Computer Engineering en_US
dc.date.accessioned 2007-03-27T18:12:01Z
dc.date.available 2007-03-27T18:12:01Z
dc.date.issued 2006-11-21 en_US
dc.description.abstract This thesis describes a method developed to quickly measure the Rayleigh wave Q for a test material using a minimally invasive laser probe. The probe was donated to our lab by Dr. Alex Maznev at Phillips AMS in Natick, Ma. The machine was originally used to measure ultra thin film metal thicknesses; however we have utilized it to suit our needs. The optics head relies on a technique known as the transient grating method to generate a dispersion curve. This dispersion curve is then operated on by a local approximation for the Kramers-Kronig relations. The Kramers-Kronig relations for acoustic waves relate the real and imaginary parts of the dynamic compressibility to one another. The real part of the compressibility relates to the phase velocity of the wave and the imaginary part relates to the attenuation. Once the attenuation for the corresponding range of frequencies is determined the last step is to apply both the dispersion data and the attenuation data to the material Q equation to find Q over a range of frequencies. This thesis discusses the design of the machine, the theory behind the Kramers-Kronig relations and surface acoustic waves, the experimental procedure, and lastly results generated by the technique. en_US
dc.description.degree M.S. en_US
dc.format.extent 1180352 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/13998
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Kramers-Kronig en_US
dc.subject Transient grating en_US
dc.subject Material Q en_US
dc.subject Lasers en_US
dc.subject Acoustics en_US
dc.subject Rayleigh waves en_US
dc.title Measurement of Material Q in Rayleigh Waves with a Laser Based Acoustic Spectrometer en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Hunt, William D.
local.contributor.corporatename School of Electrical and Computer Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 8dfe8c09-39f6-4895-9ac7-547efb52a173
relation.isOrgUnitOfPublication 5b7adef2-447c-4270-b9fc-846bd76f80f2
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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