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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.
Side-scan sonar is used to efficiently create images of large areas of the sea floor, as seen from the point of view of the transducer. Seismic sources such as sparkers and boomers are used in seismic reflection profiling, using sound pulse frequencies that effectively penetrate the solid seabed and are partially reflected by changes in ...
Backscatter and high-frequency side-scan sonar techniques may provide faster characterisation of spoil extent, but only when the spoil's acoustic reflectivity or topology is sufficiently distinct from native sediments. SPI devices produce imagery of the sediment/water interface with sub-millimetre resolution.
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.
Given that side scan sonar, with its across-track fan-shaped swath of insonification, had successfully exploited the cross-track variation in echo amplitudes, to achieve high quality images of the seabed, it seemed a natural progression that the fan-shaped across-track pattern of insonification associated with the new monotone higher frequency ...
Three main applications are used: single beam echo sounding is generally used for depth measurement below the vessel, side-scan sonar produces images showing the shape of underwater objects well, but is not very accurate for depth measurement, and multibeam echosounders provide fairly accurate three dimensional positions for a swath of points ...
Optical imaging systems have been successfully used in deep ocean searches, either independently or in combination with a side-scan sonar. The obvious advantage of an optical imaging system is that the image produced can result in identification of the target without the need for time-consuming contact classification.
The side-scan sonar is useful for scientists as it is a quick and efficient way of collecting imagery of the sea floor, but it cannot measure other factors, such as depth. [ 11 ] [ 12 ] Therefore, other depth measuring sonar devices are typically accompanied with the side-scan sonar to generate a more detailed survey.