G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 15/88 (2006.01) G01S 7/62 (2006.01) G01S 15/10 (2006.01) G01S 15/89 (2006.01)
Patent
CA 2270252
A system for sonically probing a seabed comprises at least one row (14, 100) of transducers (22, T1, T2, TZ) that each can produce a sonic beam, and a corresponding row of sonic detectors (24, D1, D2). Each transducer is independently energized to produce a narrow sonic beam (40), with resulting seabed or subsea echoes being detected to produce one pixel of a display (60, 80, 90, 150) 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 sonification at different frequencies. The transducers are closely spaced, at a center-to-center distance (G) 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 (32) such as 2mHz, 1 mHz, 500kHz or 100kHz. This results in an optimized narrow sonic beam, with each pulse having a duration (A) on the order of 10 to 100 microseconds to produce a modulation frequency on the order of 200kHz to 5Khz, and with each pulse having a high maximum energy to create a wide frequency bandwidth in the seabed.
Guigne International Ltd.
Pangeo Subsea Inc.
Smart & Biggar
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