Ultrasonic Measurements by Means of Continuous Waves in Porous Materials Saturated with Air

dc.contributor.author Longo, Roberto
dc.contributor.author Duclos, Aroune
dc.contributor.author Groby, Jean-Philippe
dc.date 2018-02-17T22:32:52.000
dc.date.accessioned 2020-06-30T06:53:51Z
dc.date.available 2020-06-30T06:53:51Z
dc.date.issued 2016-01-01
dc.description.abstract <p>The study of porous materials has always been of great interest. Several characterization methods have been developed by means of ultrasonic waves, mainly because of their non-invasive behavior. A typical set-up involves transmission and reflection measurements through the test material using pulse signals. The received echoes are analyzed and compared with analytical models in order to estimate some specific acoustic properties of the sample itself. The main drawback of this approach is the low signal-to-noise ratio recorded when testing highly attenuating materials. This disadvantage is even more pronounced for measurements in air.</p> <p><br />The present work aims to overcome these limitations, replacing the excitation signals by continuous muti-harmonic waves. These signals have been developed by optimizing the phase of each harmonic, resulting in a low crest factor and consequently in a better signal-to-noise ratio [1,2]. Moreover their frequency content can be easily adapted to the different transducers used during the test. The method has been used to test a foam saturated with air, performing ultrasonic measurements in transmission/reflection, at different angles of incidence. The results show a significant improvement of the measurements, facilitating the estimation of the foam acoustics properties.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/qnde/2016/abstracts/275/
dc.identifier.articleid 4878
dc.identifier.contextkey 9228047
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/2016/abstracts/275
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/62033
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/qnde/2016/abstracts/275/083_Ultrasonic_Measurements.pdf|||Fri Jan 14 23:07:22 UTC 2022
dc.subject.disciplines Acoustics, Dynamics, and Controls
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanical Engineering
dc.title Ultrasonic Measurements by Means of Continuous Waves in Porous Materials Saturated with Air
dc.type event
dc.type.genre event
dspace.entity.type Publication
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