Results 261 to 270 of about 5,046,171 (299)
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Measurements of the target strength of fish
Radio and Electronic Engineer, 1963Measurements have been made at 30 kc/s of the target strength of dead cod, herring, plaice and perch. Four independent series of measurements have been made between 1955 and 1959.In three of the series, false Onazote swimbladders were placed in the body of the fish to simulate the acoustic properties of the normal swimbladder. The results are tabulated
D.H. Cushing +4 more
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Journal of Sound and Vibration, 1969
Abstract Knowledge of the acoustic target strength of a fish (or of a shoal of fish) is required to enable the performance of present and future sonar equipments to be determined for fish targets. Also, it is hoped that measurement of the strengths and characters of the echoes received from fish will give a reliable guide to the size of the fish and,
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Abstract Knowledge of the acoustic target strength of a fish (or of a shoal of fish) is required to enable the performance of present and future sonar equipments to be determined for fish targets. Also, it is hoped that measurement of the strengths and characters of the echoes received from fish will give a reliable guide to the size of the fish and,
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Defeat by High Strength Targets
2012The protective capability of a structure against a given threat can be evaluated by several measures. One of them is the ballistic limit velocity (Vbl) of the specific armor/threat combination. Obviously, the aim of the armor designer is to increase the value of Vbl without increasing the weight of the structure.
Zvi Rosenberg, Erez Dekel
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Comparison of target strengths of marine organisms
The Journal of the Acoustical Society of America, 1978An empirical relationship which links fish length, target aspect, and target strength for geometric region scattering has been developed [R. H. Love, J. Acoust. Soc. Am. 62, 1397–1403 (1978)]. When peak target strengths of squid, crabs, and penaeid prawns at dorsal aspect are compared with this relationship, it can be noted that the target strengths ...
J. D. Penrose, G. T. Kaye
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Target Strength and Echo Structure
1985The term Target Strength (TS) is conventionally associated with its application in the active sonar equation. In practise, in the context of a complex target such as a submarine TS can denote a number of descriptors of target echo structure and may be measured and defined in a number of ways.
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On target strength of Baltic herring
2007No abstracts are to be cited without prior reference to the author.Reliable TS – length relationship is required to improve acoustic algorithms of abundance estimation of Baltic herring. The proposed relationships, empirically obtained in the different parts of the Baltic Sea, produce up to 8 dB – difference in the herring TS.
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Target strength observations of wobbly bubbles
Journal of the Acoustical Society of America, 2016Large methane bubbles released from shallow water seabed are of interest because bubbles facilitate the transport process of gas through their journey in the water column, making them more susceptible to reaching the atmosphere than those released from deep water. Several models that relate bubble radius and acoustic backscattering for ideal, spherical
Alexandra M. Padilla +2 more
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Target strength of liquid-filled spheres
The Journal of the Acoustical Society of America, 1983The liquid-filled target sphere is a high target strength reflector which, since its first use in 1971, has proven to be of great utility in sonar research. The spherical metal shell filled with a low-velocity liquid is being used as a calibrated, passive, aspect-independent target.
Don L. Folds, Chester D. Loggins
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Measurements and modeling of the target strength of divers
Europe Oceans 2005, 2005Acoustic methods (sonars) offer a potential tool for detecting and tracking of underwater swimmers. The main unknown in assessing the feasibility of using sonar to detect swimmers is their target strength. The target strength of diver with tanks, buoyancy control, wet or dry suit, etc. is a complicated function of aspect angle and frequency.
Sarangapani, Sairajan +5 more
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Dolphin detection of targets as a function of angular presentation and target strength.
The Journal of the Acoustical Society of America, 2008As part of an ongoing study, bottlenose dolphin (Tursiops truncatus) echolocation beam steering was assessed as a dolphin performed a target detection task (4- and 7.62-cm spheres) while echolocating with its head held in a fixed orientation and monitored via underwater camera.
Patrick Moore +3 more
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