The Journal of the Acoustical Society of Korea

한국음향학회 (The Acoustical Society of Korea)
권호 표지

Bistatic Scattering from a Hemi-Spherically Capped Cylinder

  • Park, Sang-Hyun (Department of Earth & Marine Sciences, Hanyang University) ;
  • La, Hyoung-Sul (Department of Earth & Marine Sciences, Hanyang University) ;
  • Cho, Sung-Ho (Department of Earth & Marine Sciences, Hanyang University) ;
  • Oh, Taek-Hwan (Department of Earth & Marine Sciences, Hanyang University) ;
  • Kim, Young-Shin (Department of Earth & Marine Sciences, Hanyang University) ;
  • Lee, Chang-Won (Department of Earth & Marine Sciences, Hanyang University) ;
  • Na, Jung-Yul (Department of Earth & Marine Sciences, Hanyang University)
  • 발행 : 2006.09.15
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초록

The bistatic scattering of an incident wave by a hemi-spherically capped cylinder is of particular interest because it has rarely been studied until the present day. The configuration of a hemi-spherically capped cylinder is similar to naval underwater weapons (submarines, mines, torpedos, etc.), but which is not exactly the same. This paper describes a novel laboratory experiment aimed at direct measurement of bistatic scattering by a hemi-spherically capped cylinder. Bistatic scattering by a hemi-spherically capped cylinder was measured in an acoustic water tank (5m long, 5m wide, 5m deep) using a high frequency projector (120kHz) and hydrophone. Measurements of monostatic scattering were also made under the same conditions. The bistatic scattering pattern by a hemi-spherically capped cylinder was measured against the incident angles $(0^{\circ},\;15^{\circ},\;20^{\circ},\;30^{\circ},\;45^{\circ},\;60^{\circ},\;90^{\circ})$ in order to verify various scattering pattern characteristics by the change of incident angle. The results indicate that the bistatic scattering TS at a wide scattering angle is much stronger than the mono static scattering TS. In bistatic scattering, the forward scattering TS is significantly stronger than the backward scattering TS, and the forward scattering pattern is also broader. In case of seven incident angles, the maximum value of forward scattering TS is about 14dB stronger than that of backward scattering TS. It is also found that forward scattering varies with the incident angle of sound to a much less extent than backscattering, and it is not seriously affected by the incident angle. These features could be the advantages of using forward scattering for detecting underwater targets at long range and increasing detection area and probability.

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참고문헌

  1. James J. Faran, JR, 'Sound Scattering by Solid Cylinders and Spheres,' J. Acoust. Soc. Am, 23 405-418, 1951 https://doi.org/10.1121/1.1906780
  2. G. R. Barnard and C. M. McKinney, 'Scattering of acoustic energy by solid and air-filled cylinders in water,' J. Acoust. Soc. Am., 33 226-238, 1961 https://doi.org/10.1121/1.1908625
  3. Doolittle, R. D. and H Uberall, 'Sound Scattering by Elastic Cylindrical Shells,' J. Acoust. Soc. Am., 39 272-275 (1966) https://doi.org/10.1121/1.1909886
  4. Lawrence Flax, 'Scattering of an obliquely incident acoustic wave by an infinite cylinder,' J. Acoust, Soc. Am., 68 1832-1835, 1966 https://doi.org/10.1121/1.385173
  5. J. W. Dickey, 'Acoustic high-frequency scattering by elastic cylinders,' J. Acoust. Soc. Am., 66 (1) 275-283, 1979 https://doi.org/10.1121/1.383079
  6. T.K Stanton, 'Sound scattering by cylinders of finite length I. Fuild cylinders,' J. Acoust. Soc. Am., 83 5563, 1988
  7. T.K Stanton, 'Sound scattering by cylinders of finite length II. Elastic cylinders,' J. Acoust. Soc. Am., 83 (1) 64-67, 1988 https://doi.org/10.1121/1.396185
  8. T.K Stanton, 'Sound scattering by cylinders of finite length III. Deformed cylinders,' J. Acoust. Soc. Am., 83 (2) 691-705, 1989
  9. C. S. Clay, 'Low-resolution acoustic scattering models: Fluid-filled cylinders and fish with swim bladders,' J. Acoust. Soc. Am., 89 (5) 2168-2179, 1991 https://doi.org/10.1121/1.400910
  10. Scot F. Morse and Philip L. Marston, 'High-frequency backscattering enhancements by thick finite cylindrical shells in water at oblique incidence; Experiments, interpretation, and calculations,' J. Acoust Soc. Am., 103 (2) 785-794, 1998 https://doi.org/10.1121/1.421200
  11. H. Medwin, and C. S. Clay, Fundamentals of Acoustical Oceanography, Academic Press, New York, 1997
  12. Henry Cox, Fundamentals of bistatic active sonar: Kluwer Academic Publishers, Arlington, 1989