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 ?
These faults had been discovered with the old wide-beam echo sounders, but their structural complexity and influence on neighboring ridge segments could not be appreciated without the new generation of maps.
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)).
Figure 1 illustrates typical data provided by a sidescan sonar, subbottom profiler and echo sounder when operated over a pipeline.
The echo sounder uses an antenna on the bottom of the boat to send messages down to the seabed and back to draw a image of what lies beneath.
The Echo Sounder can be equipped with a range of payload sensors to meet specific applications or user's needs.
Current is the EM3002 multibeam echo sounder system, full specification of both systems is detailed within the tender documents available from our Buyer Profile http://nlb.
With RayTech Pathfinder PC navigation software, even a PC can be transformed into a digital Adaptive Echo Sounder.
It will be integrated with a variety of survey sensors, including the EM 2000 multi-beam echo sounder for swath bathymetry and imagery.
Tenders are invited for Echo Sounder Equipment Led Display Gen Hut Set In Wooden Box With Hand Battery With 100 Mtr Wire.
The award is to determine the contractor for the supply of 1 (one) specialized seagoing cutter equipped for monitoring and maintenance of aids to navigation insurance - marine and channel buoys and Prommer activity in the water areas of public ports and channels provided with the appropriate foundation (well) to attach the echo sounder and the accompanying equipment and aft working deck.
5 kHz echo sounder forDetecting the distribution of sediment and hard substrate.