NDLI: Robustness of target strength of an immersed, hollow ceramic flotation sphere of constant shell thickness

Content Provider	IEEE Xplore Digital Library
Author	Francis, D.T.I. Foote, K.G. Atkins, P.R.
Copyright Year	2007
Description	Author affiliation: Univ. of Birmingham, Birmingham (Francis, D.T.I.)
Abstract	Deep-sea flotation spheres consisting of an air-filled ceramic shell are made to a very high tolerance, suggesting their application as sonar targets, possibly for calibration use. A previous study documented preliminary measurements made on hollow alumina spheres of nominal diameter 91.44 mm and shell thickness 1.3 mm over the total frequency band 5-150 kHz. Here, the sensitivity of target strength to geometrical and material- property values is quantified by means of the analytical solution for scattering of plane acoustic waves by an ideal hollow, homogenous, elastic, spherical shell. The parameters of variation include the outer diameter and thickness of the spherical shell; mass density and longitudinal- and transverse-wave sound speeds of the shell material; mass density and sound speed of the immersion medium; and interior air pressure. The frequency range of the computations is 0.1-150 kHz. The target strength is observed to be quite sensitive to variations in most of the parameters. However, the sphere can be used as a standard target for sonars with operating frequencies in the band 8-13 kHz and for narrowband scientific echo sounders at certain ultrasonic frequencies.
Starting Page	1
Ending Page	5
File Size	2566085
Page Count	5
File Format	PDF
ISBN	9780933957350
DOI	10.1109/OCEANS.2007.4449364
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-29
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Robustness Ceramics Sonar applications Sonar measurements Calibration Acoustic measurements Frequency measurement Thickness measurement Acoustic scattering Acoustic waves
Content Type	Text
Resource Type	Article

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