Ultrasound pulse-echo measurements on rough surfaces with linear array transducers

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

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The echo from planar surfaces with rms roughness, Rq, in the range from 0-155 μm was measured with a clinical linear array transducer at different angles of incidence at 6 MHz and 12 MHz. The echo-pulse from the surfaces was isolated with an equal sized window and the power of the echo-pulse was calculated. The power of the echo from the smooth surface (Rq = 0) is highly angle-dependent due to a high degree of specular reflection. Within the angular range considered here, -10° to 10°, the variation spans a range of 18 dB at both 6 MHz and 12 MHz. When roughness increases, the angle-dependence decreases, as the echo process gradually changes from pure reflection to being predominantly governed by backscattering. The power of the echoes from the two roughest surfaces (Rq = 115 μm and 155 μm) are largely independent of angle at both 6 MHz and 12 MHz with a variation of 2 dB in the angular range from -10° to 10°. The least rough surfaces (Rq = 32 μm and 89 μm) have responses in between with a higher degree of angle-dependence at 6 MHz than at 12 MHz.
Original languageEnglish
Title of host publicationProceedings of the International Congress on Ultrasonics
PublisherAmerican Institute of Physics
Publication date2012
Pages211-214
DOIs
StatePublished

Conference

ConferenceInternational Congress on Ultrasonics
CountryPoland
CityGdansk
Period05/09/1108/09/11
Internet addresshttp://icu2011.ug.edu.pl
NameAIP Conference Proceedings
Volume1433
ISSN (Print)0094-243X
CitationsWeb of Science® Times Cited: 0

Keywords

  • Ultrasound, Linear array transducer, Surface roughness, Obligue interface
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