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The transducers were either contained in one hull-mounted package or with two packages on either side of the vessel. Next the transducers evolved to fan-shaped beams to produce a better "sonogram" or sonar image. 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.
The array length is 1,500 m (4,900 ft) with an operational depth of 150 to 460 m (500 to 1,500 ft). The SURTASS LFA ship must maintain a minimum speed of approximately 6 kilometres per hour (3.2 knots) through the water in order to tow the hydrophone array in the horizontal plane.
In 1940, US sonars typically consisted of a magnetostrictive transducer and an array of nickel tubes connected to a 1-foot-diameter steel plate attached back-to-back to a Rochelle salt crystal in a spherical housing. This assembly penetrated the ship hull and was manually rotated to the desired angle.
It is usual for single beam echo sounders to be permanently installed on a ship with the transducer arrays mounted through the hull. [9]: Ch. 2 Multi-beam systems may be permanent or portable and mounted over the side or towed. Resolution depends on frequency and height above the bottom, depth range depends to some extent on frequency, and ...
When the fish swims directly under the transducer, it is closer to the boat so the stronger signal shows a thicker line. As the fish swims away from the transducer, the distance increases, which shows as progressively deeper pixels. The image to the right shows a school of white bass aggressively feeding on a school of threadfin shad. Note the ...
Single beam echo sounders are permanently installed on a ship, with the transducers mounted through the hull. [24]: Ch. 2 Multi-beam systems are also permanent and mounted through the hull, portable and mounted over the side, or towed. Resolution depends on the signal frequency and height of the transducers above the bottom, and depth range ...
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