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Detection of buried objects at low grazing angles: preliminary experimental results

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Abstract
This report considers the acoustic detection of objects buried in the seabed, and especially the possibility of using subcritical insonification geometries in order to increase coverage rate.
 
Experimental results are presented for acoustic transmissions in the approximate frequency range 2-
 
16 kHz both above and below the nominal critical angle of the sediment. The buried objects studied
 
are a solid aluminum sphere of radius a, = 0.3 m and a 2 m long water-filled cylindrical steel shell with
 
radius a, = 0.25 m. Preliminary processing of the data has shown that gains in signal-to-noise ratio
 
can be obtained for subcritical cases by emphasizing the lower frequency components (in this case, f
 
< 3 kHz) where models predict that the target echo is strongest due to the evanescent nature of the
 
incident acoustic wave.
 

URI
http://hdl.handle.net/20.500.12489/512

Report Number
SR-293

Collections
  • Technical Reports

Date
1998/06

Author(s)
Fox, Warren L. J.
; 
Maguer, Alain

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SR-293-UU.pdf (6.862Mb)

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