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 ?
Figure 1 illustrates typical data provided by a sidescan sonar, subbottom profiler and echo sounder when operated over a pipeline.
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.
Ken has led over 20 deep-sea expeditions and has had the good fortune to participate in some of the first explorations of the mid-ocean ridge using multi-beam echo sounders, remotely operated vehicles, and submersibles.
Acoustic measurements were collected with a calibrated Simrad (3) (Kongsberg AS, Horten, Norway) EK60 scientific echo sounding system (Simrad, 2004) with 5 split-beam transducers (18, 38, 70, 120, and 200 kHz) and a Simrad ME70 multibeam echo sounder (Trenkel et al.
The combination of expanding into television and the introduction of our new HDFI echo sounders will make this an exciting season for Raymarine," comments Terry Carlson, President, Raymarine Inc.
Recently, multi-beam echo sounders enable measurements not only directly under the ship, but also in a swath (strip) with a width of several times the water depth on either side of the ship, The error in the horizontal positioning lies currently in the order of magnitude of the distance over which sand waves migrate in a year.
Raymarine is also offering two new digitally adaptive echo sounders -- a 7-inch L770D and a 10.
The vessels will search the sea floor using side scan sonar, multi-beam echo sounders and video cameras to locate and identify the aircraft debris.
Contract Awarded for Providing of echo sounders parts
Tenders are invited for reputed & experienced annual maintenance Contract providers for digital echo sounders of model Bathy 500 MF, Bathy 500 DF and Bathy 500 MF Sy
Contract notice: Purchase of a Portable Multi-Beam Echo Sounder System for Fleet Hydrographic Mobile Unit and to Include 5 years in Service Support.
Supply and installation of shallow water multibeam echo sounder, bound in the Andalusian Centre for Marine Science and Technology (CACYTMAR) of the University of CEidiz.