2019_programme: MEASUREMENTS OF ACOUSTIC BACKSCATTERING FROM SYNTACTIC-FOAM SPHERES
- Session: 02. Underwater acoustic calibration, testing, facilities and standards
Organiser(s): Robinson Stephen, Humphrey Victor, Linné Markus, Évora Victor
- Lecture: MEASUREMENTS OF ACOUSTIC BACKSCATTERING FROM SYNTACTIC-FOAM SPHERES [invited]
Paper ID: 926
Author(s): Wang Liansheng , Robinson Stephen P.
Presenter: Wang Liansheng
Presentation type: oral
Abstract: Spherical targets were fabricated by machining syntactic foam samples from three products, HYTAC-W, HYTAC-WF, and HYTAC-XTL manufactured by CMT Materials, Inc. The compressional and shear wave speeds in the materials were determined by measurements. The nominal diameter of the spheres was 60 mm. Each sphere was held within its own minimum-knot bag woven of monofilament nylon and suspended in a laboratory tank during measurements in order to minimise the additional scattering effects. \n\nAcoustic backscattering was measured by ensonifying each sphere with a short-duration broadband signal generated with a monostatic transducer, spanning the respective frequency range 80-200 kHz. Measurements of backscattering by the syntactic foam spheres were accompanied by similar measurements made with a sphere made of tungsten carbide with 6% cobalt binder, with a diameter of 75 mm which has a known response in order to verify the measurements. Measured form functions are compared with model prediction using the acoustic properties measured previously in a separate study. \n\n
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- Corresponding author: Dr Wang Lian Sheng
Affiliation: National Physical Laboratory
Country: United Kingdom
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