Accession Number : ADA333419
Title : Acoustic Casimir Effect
Descriptive Note : Master's thesis
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : Homes, Christopher David
PDF Url : ADA333419
Report Date : JUN 1997
Pagination or Media Count : 45
Abstract : In 1948, Hendrick Brugt Gerhard Casimir predicted that two closely spaced uncharged conducting plates in vacuum would be mutually attracted. This attractive force is an indirect manifestation of the quantum electromagnetic zero point field (ZPF). When the indirect manifestations of the ZPF are interpreted as due to radiation pressure, acoustic noise can provide an excellent analog to investigate the Casimir effect as well as other effects due to the ZPF. Force measurements between two parallel plates are performed in an acoustic chamber with a broadband noise spectrum within a 5-15 kHz band and an intensity of 133 dB (re 20 %Pa). When the results are compared with the appropriate theory, very good agreement is obtained. Applications of the acoustic Casimir effect to noise transduction can provide new means to measure background noise. Because attractive or repulsive forces can be obtained by adjusting the noise spectrum or the plate geometry, a non-resonant method of acoustic levitation is also suggested.
Descriptors : *ELECTROMAGNETIC FIELDS, *ACOUSTIC SIGNATURES, MEASUREMENT, VACUUM, SPECTRA, RESONANCE, BROADBAND, ACOUSTICS, TRANSDUCERS, PARALLEL ORIENTATION, CHAMBERS, BACKGROUND NOISE, FORCE(MECHANICS), NOISE(SOUND), RADIATION PRESSURE.
Subject Categories : Acoustic Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE