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Proceedings Paper

Imaging capability of the higher-frequency subsystem of a dual-frequency acoustic lens sonar system
Author(s): Joseph L. Lopes; Iris C. Paustian; Robert Marciniak; Dave Van Tol; Donald L. Folds
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Paper Abstract

An experimental dual-frequency acoustic lens sonar system, designed to detect both buried and non-buried objects is described with emphasis on the higher frequency subsystem. The lower frequency subsystem (35 - 100 kHz) forms conical beams with beam widths near 5 degree(s) using discrete transducer elements in the lens focal plane for both transmission and reception. The higher frequency (1 - 2 MHz) lens system is designed to be contained within the volume of the lower frequency subsystem to create a compact dual-frequency system. The higher frequency system consists of three 20-cm long cylindrical lenses designed to form fan-shaped beams over a 20 degree(s) field of view. The retina is positioned 34 cm from the entrance aperture. A test array containing several discrete elements with 1.0-mm pitch has been designed for initial testing. The final system will use a retina with 80 - 100 elements. The imaging system is designed to generate images with cross-range resolutions from 0.1 degree(s) to 0.25 degree(s), and is designed to be tested in both bistatic or monostatic modes. In the monostatic mode, results of spatial multiplexing of beams in the ratio of 3, 4, and 5 will be compared. The system is designed to make a thorough parametric evaluation of imaging in the 1 - 2 MHz range over a wide range of angular resolutions and to relate design parameters to operational performance for forward looking systems.

Paper Details

Date Published: 12 July 2000
PDF: 12 pages
Proc. SPIE 4039, Information Systems for Divers and Autonomous Underwater Vehicles Operating in Very Shallow Water and Surf Zone Regions II, (12 July 2000); doi: 10.1117/12.391891
Show Author Affiliations
Joseph L. Lopes, Naval Surface Warfare Ctr. (United States)
Iris C. Paustian, Naval Surface Warfare Ctr. (United States)
Robert Marciniak, The Pennsylvania State Univ. (United States)
Dave Van Tol, The Pennsylvania State Univ. (United States)
Donald L. Folds, Ultra-Acoustics Inc. (United States)


Published in SPIE Proceedings Vol. 4039:
Information Systems for Divers and Autonomous Underwater Vehicles Operating in Very Shallow Water and Surf Zone Regions II
Jody L. Wood-Putnam, Editor(s)

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