DocumentCode :
2947915
Title :
The finite amplitude depth sounder (FADS)
Author :
Walsh, George M.
Author_Institution :
Raytheon Company, Portsmouth, RI, USA
fYear :
1971
fDate :
21-24 Sept. 1971
Firstpage :
197
Lastpage :
201
Abstract :
Resolution of echo sounders and sub-bottom profilers is limited by the beamwidth of the system. Beamwidths of 
or so are desired, but at the low operating frequencies required by attenuation of the signals the apertures become very large. A method based on the inherent nonlinearity of the acoustic medium at high intensities (the finite amplitude effect) has been developed which permits an order of magnitude reduction in aperture dimensions. An experimental finite amplitude system with a beamwidth at an operating frequency of 12 KHz is described, and at-sea test results presented.
or so are desired, but at the low operating frequencies required by attenuation of the signals the apertures become very large. A method based on the inherent nonlinearity of the acoustic medium at high intensities (the finite amplitude effect) has been developed which permits an order of magnitude reduction in aperture dimensions. An experimental finite amplitude system with a beamwidth at an operating frequency of 12 KHz is described, and at-sea test results presented.Keywords :
Acoustic beams; Acoustic transducers; Analytical models; Apertures; Attenuation; Fires; Frequency response; Marine vehicles; Oceans; Signal resolution;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in the Ocean Environment, IEEE 1971 Conference on
Conference_Location :
San Diego, CA, USA
Type :
conf
DOI :
10.1109/OCEANS.1971.1161077
Filename :
1161077
Link To Document :
