Extension of sampling theorem for wave equations

Lawu, Tjundewo; Ueda, Masahiro

doi:10.1250/ast.24.400

Cited by 1 publication

(1 citation statement)

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“…For this purpose, we constructed an underwater acoustic camera, which is originally used for the diagnosis of internal organs and embryo in a human body. [1][2][3][4][5] Here, we propose a method of the observing the morphologies and behaviors of marine animals using an underwater acoustic camera. The acoustical images of animals collected using an underwater acoustic camera provide useful information about the morphological and behavioral characteristics of living marine animals even in dark or opaque water.…”

Section: Introductionmentioning

confidence: 99%

Observation of Marine Animals Using Underwater Acoustic Camera

Iida

Takahashi

Tang

et al. 2006

jjap

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An underwater acoustic camera enclosed in a pressure-resistant case was constructed to observe underwater marine animals. This enabled the measurement of the size, shape, and behavior of living marine animals in the detection range up to 240 cm. The transducer array of the acoustic camera was driven by 3.5 MHz ultrasonic signals, and B-mode acoustic images were obtained. Observations were conducted for captive animals in a water tank and for natural animals in a field. The captive animals, including fish, squid and jellyfish, were observed, and a three-dimensional internal structure of animals was reconstructed using multiple acoustical images. The most important contributors of acoustic scattering were the swimbladder and vertebra of bladdered fish, and the liver and reproductive organs of invertebrate animals. In a field experiment, the shape, size, and swimming behavior of wild animals were observed. The possibilities and limitations of the underwater acoustic camera for fishery applications were discussed.

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Section: Introductionmentioning

confidence: 99%