Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1998-06-15
2000-12-12
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
367106, 367107, 367131, 367153, G01S 1589
Patent
active
061607568
ABSTRACT:
A system for sonically probing a seabed comprises at least one row of transducers that each can produce a sonic beam, and a corresponding row of sonic detectors. Each transducer is independently energized to produce a narrow sonic beam, with resulting seabed or subsea echoes being detected to produce one pixel of a display formed by an X-Y array of pixels, before a next transducer is energized and its echoes are detected to produce another pixel of the display. When the system detects a large change in echo amplitude at adjacent seabed locations, then scanning at those locations is accentuated by analysis and by additional sonificiation at different frequencies. The transducers are closely spaced, at a center-to-center distance of typically about 3.5 cm, to provide good horizontal resolution. Each transducer is energized to produce a sonic pulse which, dependent on the application, has a carrier frequency of 0.25 MHz. This results in an optimized narrow sonic beam, with each pulse having a duration on the order of 10 to 100 microseconds to produce a modulation frequency on the order of 200 kHz to 5 Khz, and with each pulse having a high maximum energy to create a wide frequency bandwidth in the seabed.
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Guigne International Limited
Lobo Ian J.
Rosen Leon D.
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