Concerns about its safety have periodically surfaced, but Nicolson said he thinks these stem more from anxiety over the role of technology in pregnancy than from evidence of harm. This group also produced the first and only working Angle Look Sonar that could trace objects while looking under the vehicle. For example, so-called "bonding scans," images taken purely for commemorative purposes, unnecessarily expose a fetus to the high-energy sound waves, Nicolson said. 4. Which of the following is a practical application of sonar? Side-scan sonar (also sometimes called side scan sonar, sidescan sonar, side imaging sonar, side-imaging sonar and bottom classification sonar) is a category of sonar system that is used to efficiently create an image of large areas of the sea floor. b. a person who studies the ocean It was Lewis Nixon who invented the very first sonar-type listening device in 1906. c. what kind of fish they are Jan 1, 1940, Sonar helps in defeating Germany in the Battle of Britain Learn how and when to remove this template message, "Facsimile recording of sonic values of the ocean bottom", Use of side scan sonar to recover drowning victims, NOAA's use of sidescan and multibeam sonar, guide to Side-Scan Sonar acquisition and processing, U.S. Geological Survey GLORIA Mapping Program, Long baseline acoustic positioning system, Short baseline acoustic positioning system, https://en.wikipedia.org/w/index.php?title=Side-scan_sonar&oldid=964757601, Articles needing additional references from June 2008, All articles needing additional references, Creative Commons Attribution-ShareAlike License, This page was last edited on 27 June 2020, at 11:49.
5. What is an oceanographer? b. find schools of fish
In order to get closer to the bottom in deep water the side-scan transducers were placed in a "tow fish" and pulled by a tow cable. This involved lowering a chunk of lead (usually a cannonball) on a very long piano wire to the bottom of the sea. Visit our corporate site. SONAR is short for Sound Navigation And Ranging. Stay up to date on the coronavirus outbreak by signing up to our newsletter today. Sound is sent from the surface, called a ping, and it is then reflected back to the boat after it hits an underwater object.  If you know the velocity of that ping, then you can calculate how deep the object is by timing how long it takes for the sound to return to the device.  Since sound travels in water at a known speed, about 1,500 m/s, then calculation is a simple matter: Distance = speed x time / 2.  Why divide by 2? Because the sound makes a round trip, first it has to go to the object and then bounce back. A team led by Martin Klein at Edgerton, Germeshausen & Grier (later E.G. Lewis Nixon invented the very first Sonar type listening device in 1906 as a way of detecting icebergs. In the late 1980s, commercial systems using the newer, cheaper computer systems developed digital scan-converters that could mimic more cheaply the analog scan converters used by the military systems to produce TV and computer displayed images of the scan, and store them on video tape.
Sonar is used today to help oceanographers to map the ocean floor and even lakes. The valleys and ridges and even deep trenches can be cataloged without ever having to leave a ship. The data from sonar is entered into a computer program which then creates a model of the ocean floor. Seeing a developing fetus has a humanizing effect, too. The ship, laden with paving blocks, crashed into the rocks of a breakwater, and its smashed oaken hull quickly filled with water. Original article on Live Science. However, using sonar remained in the experimental stage for another 90 years, and sailors continued to make their measurements the old fashioned way. Wood , produced a prototype active sound detection system. a. the device is towed under water Side-scan sonar is also used for fisheries research, dredging operations and environmental studies. a. locating fish         b. finding sunken ships However, at high power, ultrasound waves are able to damage human tissue. One of the main advantages of ultrasound is that it's noninvasive.