Acoustical Society of America, Fall 1994 Meeting
Title: Single-mode excitation in a laboratory waveguide using feedback control
Authors: John R. Buck, Mark Johnson, James C. Preisig, Josko Catipovic

Previous work formulated an adaptive algorithm for exciting a single mode in a shallow-water waveguide control [Buck et al., J. Acoust. Soc. Am. 95, 2927(A) (1994)]. This paper presents results obtained using this algorithm in a laboratory waveguide experiment under a variety of conditions. Unlike previous laboratory single-mode excitation experiments [Clay and Huang, J. Acoust. Soc. Am. 67, 792-794 (1980); Gazanhes and Garnier, ibid. 69, 963-969 (1981) ], our algorithm does not require a priori environmental knowledge, but only the sound-speed profile at the feedback array. The experiment results to be presented demonstrate the algorithm's convergence behavior and robustness to environmental mismatch. If time permits, present experimental results illustrating the ability of the algorithm to track time variations in the channel will also be presented. [Work supported by ONR and ARPA.].

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