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The company needed someone to monitor a new kind of technology called side-scan sonar, which uses ultrasonic sound waves to create images of items on an ocean or lake bottom. "I volunteered," he said.
Side-scan uses a sonar device that emits conical or fan-shaped pulses down toward the seafloor across a wide angle perpendicular to the path of the sensor through the water, which may be towed from a surface vessel or submarine (called a “towfish”), or mounted on the ship's hull.
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Lanternfish account for as much as 65 percent of all deep sea fish biomass and are largely responsible for the deep scattering layer of the world's oceans.. The phantom bottom is caused by the sonar misinterpreting as the ocean floor a layer of small seagoing creatures that congregate between 1,000 and 1,500 feet (300 and 460 m) below the surface.
Diver detection sonar (DDS) systems are sonar and acoustic location systems employed underwater for the detection of divers and submerged swimmer delivery vehicles (SDVs). The purpose of this type of sonar system is to provide detection, tracking and classification information on underwater threats that could endanger property and lives.
Garry Kozak is a pioneer in the use of side-scan sonar ... Jun. 21—The images captured from the lake bottom were surprisingly clear: a piece of aircraft fuselage, painted with black and red ...
The 16-person journey mounted in September 2023 from Tarawa, Kirbati, a port near Howland Island, and the team’s unmanned submersible scanned 5,200 square miles of ocean floor.
Another reason for variation in echolocation is habitat. For all sonar systems, the limiting factor deciding whether a returning echo is detected is the echo-to-noise ratio (ENR). The ENR is given by the emitted source level (SL) plus the target strength, minus the two-way transmission loss (absorption and spreading) and the received noise. [79]
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