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By Hua Lee

The foreign Symposium of Acoustical Imaging has been widely known because the optimum discussion board for displays of complicated examine ends up in either theoretical and experimental improvement. Held usually considering the fact that 1968, the symposium brings jointly th prime foreign researchers within the quarter of acoustical imaging. The 24 assembly is the 3rd time Santa Barbara hosted this overseas convention and it's the first time the assembly was once hung on the campus of the collage of California, Santa Barbara. As many standard members spotted through the years, this symposium has grown considerably in dimension as a result caliber of the shows in addition to the association itself. many years in the past a number of and poster classes have been brought so one can accommodate this progress. furthermore, the size of the shows was once shortened so extra papers may be incorporated within the periods. in the course of fresh conferences there have been discussions concerning the threat of returning to the fantastic years while the symposium was once equipped in a single unmarried consultation with adequate time to permit for in-depth presentation in addition to discussions of every paper. And the dimensions of the assembly was once sufficiently small that folks have been in a position to have interaction in critical technical interactions and all attendees could healthy into one picture. In gentle of the limitations of the restricted finances with admire to the escalating expenses it used to be no longer thought of possible.

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Since metabolic rate has been shown to be related to swimming behavior (Torres and Childress, 1983), the observation of swimming activity can be related to animal metabolism. In order to examine this hypothesis we deployed our 3-dimensional imaging system, FishTV so that we could track the animals and determine what their swimming behavior was during daylight hours. FishTV is a multibeam echosounder (Jaffe et al, 1995) which operates at a frequency of 445 kHz so that it can track animals at ranges of 3 - 10 m whose sizes range from 1 cm and up.

1; (a) at the focal depth of 8 cm, (b) at 4 cm and (c) at 14 cm. The dotted straight-lines show the results expected for conditions of perfect spatial coherence. beamformer gain, with each decrease in transmit aperture producing a corresponding decrease in gain. Overall beamformer gain is lower for the 4 cm and 14 cm depths than for the focal depth and, at 4 cm depth, beamformer performance is poorest for the largest 45 transmit aperture. These results are consistent with the spatial coherence curves in Fig.

The results are intended for applications such as aperture design, beamformer development, and aberration compensation. THEORY AND ANALYSIS METHODS Spatial coherence was used as a measure of received acoustic field similarity as a function of the spatial separation of the observations of RF sensor data, time aligned to compensate for geometrical path-length differences. The spatial coherence function R(l ) is defined as the normalized correlation between the pressure fields received by two sensors separated by a distance l.

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