#Side scan master original tv
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. Later plotters allowed for the simultaneous plotting of position and ship motion information onto the paper record. The early paper records were produced with a sweeping plotter that burned the image into a scrolling paper record. Up until the mid-1980s, commercial side scan images were produced on paper records. 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. Next the transducers evolved to fan-shaped beams to produce a better "sonogram" or sonar image. The transducers were either contained in one hull-mounted package or with two packages on either side of the vessel. Next, units were made with two transducers to cover both sides. The earliest side-scan sonars used a single conical-beam transducer. Side-scan sonar image of submerged bridge at the bottom of Lake Murray in South Carolina Technology The sound frequencies used in side-scan sonar usually range from 100 to 500 kHz higher frequencies yield better resolution but less range. When stitched together along the direction of motion, these slices form an image of the sea bottom within the swath (coverage width) of the beam.
#Side scan master original series
The intensity of the acoustic reflections from the seafloor of this fan-shaped beam is recorded in a series of cross-track slices. 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, or mounted on the ship's hull. It also has military applications including mine detection. Side-scan sonar is also used for fisheries research, dredging operations and environmental studies. Side-scan data are frequently acquired along with bathymetric soundings and sub-bottom profiler data, thus providing a glimpse of the shallow structure of the seabed. In addition, the status of pipelines and cables on the seafloor can be investigated using side-scan sonar. Side-scan sonar imagery is also a commonly used tool to detect debris items and other obstructions on the seafloor that may be hazardous to shipping or to seafloor installations by the oil and gas industry. Side-scan sonar may be used to conduct surveys for marine archaeology in conjunction with seafloor samples it is able to provide an understanding of the differences in material and texture type of the seabed.
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