In‐situ target strength measurements of Antarctic zooplankton
نویسندگان
چکیده
منابع مشابه
Holographic insitu stress measurements
A new instrument for measuring the in siru level of stress in boreholes has been developed. The instrument operates on the principle of locally relieving the stresses acting on a rock mass by drilling a small hole into the borehole surface and recording the resultant displacement field by holographic interferometry. Because the recording technique is optical, the entire displacement field due t...
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A submarine on patrol needs to know how far it can be detected by active sonar. In order for such sonar performance calculations to be useful the target strength (TS) of the submarine must be known. Measurements done in deep water indicate that TS can vary as much as 20 dB as a function of aspect angle. This corresponds to a doubling of the detection distance in a noise limited environment, and...
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Many surveillance tasks rely on the generation of stable, continuous tracks of objects of interest. Often, track continuity has a higher priority than track accuracy, as valuable information on the identity or the origin of an object is lost by each track drop. The main source of track fragmentation are missing detections due to a limited field of view or technical or topographical masking. In ...
متن کاملTarget strength measurements of Hawaiian mesopelagic boundary community animals
A 200-kHz echosounder modified to digitize the envelope of the received echoes directly into a computer was used to measure the ex situ target strength ~TS! of live animals from the Hawaiian mesopelagic boundary community as a function of animal size, tilt and roll angle, and biological classification. Dorsal aspect TS ~in dB//1 m! at 200 kHz was related to the animal’s length: myctophid fish T...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1994
ISSN: 0001-4966
DOI: 10.1121/1.408783