echo sounder


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echo sounder,

an older instrumentation system for indirectly determining ocean floor depth. Echo sounding is based on the principle that water is an excellent medium for the transmission of sound waves and that a sound pulse will bounce off a reflecting layer, returning to its source as an echo. The time interval between the initiation of a sound pulse and echo returned from the bottom can be used to determine the depth of the bottom. An echo-sounding system consists of a transmitter, a receiver that picks up the reflected echo, electronic timing and amplification equipment, and an indicator or graphic recorder. The first patent for an echo-sounding device was granted in 1907. The Fathometer, a registered trademark often loosely applied to all depth-sounding gear, was developed (1914) as a result of research by the Canadian engineer R. A. Fessenden in the application of echo-sounding principles to iceberg detection. Application of echo-sounding principles to submarine detection during World War II resulted in the development of equipment to sound all ocean depths. In 1954 an advanced, highly accurate echo sounder called the precision depth recorder (PDR) was developed. By the early 1960s, the U.S. Navy used the new technique of Sonar Array Survey System (SASS). The National Oceanic and Atmospheric Administration has recently used an unclassified version of SASS, Sea Beam, to map more detailed representations of the seafloor. Sea Beam employs an array of sound transducers across the hull of the survey vessel which radiate sound in a swathe, thereby allowing a wide region of the seafloor to be mapped. This type of swathe-mapping technology is now the norm for seafloor mapping. Another sonar instrument called SeaMARC uses a torpedo-shaped "fish" to measure the strength of sound signals, rather than the elapsed time of the returning signals, and covers larger areas of the ocean floor.

echo sounder

[′ek·ō ‚sau̇nd·ər]
(engineering)

echo sounder

a navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return
References in periodicals archive ?
rock, ledge, river mouth), or an increased abundance of prey species (observed from the echo sounder and confirmed by hook and line).
We are proud of our association with Unique and Kongsberg for their products like the EM 2040 Multibeam Echo sounder, which help us achieve our objectives and we look forward to further developing this fruitful partnership in the future," said Dr Adel Al Shamsi, hydrographic surveying director, Bayanat for Mapping & Surveying Services.
Multibeam acoustic data collected with an ME70 echo sounder were processed to characterize parameters that could potentially be used as an index for trawlability (Weber (1)).
The transducer of the echo sounder and the kinematics of the DGPS antenna were fixed at the opposite ends of the stack positioned at midlength of the vessel.
Says one author: ``Close the land, navigating carefully and watching the echo sounder, and all will be revealed.
Precise base maps for the dive expedition were assembled using a US Navy classified multi-beam echo sounder, a French narrow beam echo-sounding system, and a deeply towed instrument package from the Marine Physical Laboratory at Scripps Institution of Oceanography (University of California, San Diego).
The integration of a radiation sensor, an echo sounder and a current profiler with Seaglider are also in development.
Tender notice number : Expression of Interest for supply of Echo Sounder ID:2018_HAUDD_51293_1
com)-- A division of Unique Maritime Group (UMG) which is one of the world's leading integrated turnkey subsea and offshore solutions provider, Unique System FZE has recently supported a significant hydrographic project that included the installation of Kongsberg's EM 2040 multibeam echo sounder units for “Bayanat for Mapping & Surveying Services (Bayanat)” in 2 different vessels at Abu Dhabi, UAE.
Fugro will use its vessel MV Fugro Equator which is equipped with a deep-water multi-beam echo sounder system and carries expert survey personnel to undertake the survey operations," according to JACC.
The 3D images were created using a multibeam echo sounder after HMS Enterprise left the Egyptian port of Safaga, the Independent reported.
A typical system suite includes: 1) positioning--DGPS, 2) subbottom profiler--Chirp, 3) echo sounder --dual frequency, 4) sidescan sonar--dual frequency, and 5) magnetometer--low noise.