Broadband ultrasonic target strengths of hollow ceramic flotation spheres

Research output: Chapter in Book/Report/Conference proceedingConference contribution


External organisations

  • University of Birmingham
  • IEEE
  • Woods Hole Oceanographic Institution


The target strengths of hollow ceramic flotation spheres manufactured by DeepSea Power and Light, Inc., and tested to a pressure equivalent of 12,000 m have been measured as a function of frequency over the bands 10-150 kHz. The spheres are made of alumina, purity 99.9%, with diameter 91.44 ± 0.2 mm, nominal thickness 1.3 mm, mass 140 ± 1 g. The target strength spectra have also been calculated theoretically assuming a mass density of 3.984 g/cm3, longitudinal- and transverse-wave sound speeds of 11000 and 6510 m/s, respectively. Measurements and computations are compared. Potential applications of the sphere as a standard acoustic target are noted.


Original languageEnglish
Title of host publicationOCEANS 2007 - Europe
Publication statusPublished - 2007
EventOCEANS 2007 - Europe - Aberdeen, Scotland, United Kingdom
Duration: 18 Jun 200721 Jun 2007


ConferenceOCEANS 2007 - Europe
CountryUnited Kingdom
CityAberdeen, Scotland