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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 ...
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.
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.
Borehole radars utilizing GPR are used to map the structures from a borehole in underground mining applications. Modern directional borehole radar systems are able to produce three-dimensional images from measurements in a single borehole. [8] One of the other main applications for ground-penetrating radars is for locating underground utilities.
Marine geophysics uses techniques largely employed on the continents, from fields including exploration geophysics and seismology, and methods unique to the ocean such as sonar. Most geophysical instruments are used from surface ships but some are towed near the seafloor or function autonomously, as with Autonomous Underwater Vehicles or AUVs.
Side-scan sonars can be used to derive maps of seafloor topography by moving the sonar across it just above the bottom. Low frequency sonars such as GLORIA have been used for continental shelf wide surveys while high frequency sonars are used for more detailed surveys of smaller areas.
For photo scanning, it doesn't get better than this $200 scanner from Amazon. You can scan stacks of photos at a time without having to manually open a scanner or align pictures perfectly.
The search involved the use of the deepest side-scan sonar ever installed and operated on a submersible, well beyond the standard commercial limitations of 6,000 meters (19,685 feet), EYOS said. ...