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- W1990280260 abstract "An underwater near-surface optoacoustic source was used for remote sea floor sensing. The laser pulse of 5- to 10-μs width irradiates a spot at the water surface. The burst of surface pressure generates a hydroacoustic pulse is somewhat like a marine mammal’s echo-location pulse. The pressure level at a distance of 1 m from the surface is about 0.1 MPa. The total acoustic energy transmitted to the ocean can amount to 1–10 J or more. Explosive laser-induced underwater acoustic source (LIUAS) are most significant for remote sea-bed sensing. (1) The signal is of ultrawide band character (1–100 kHz), hence the single shot record produces a set of narrow-band reverberation responses. (2) Scattering coefficient versus angle of incidence can be extracted. (3) High spatial resolution of the LIUAS signal. Full scale experiments were conducted in the shallow water of the Black Sea. An appropriate sea-bed scattering model was developed taking into account sound scattering by smooth large-scale (Kirchhoff) roughness of bottom relief and by anisotropic volume inhomogeneities of the subsurface sediment layer. Comparison of experimental and calculated data shows that the sea-bed reverberation was of a volume character rather than surface." @default.
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- W1990280260 date "1994-05-01" @default.
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- W1990280260 title "Laser‐induced underwater acoustic source for remote sensing of sea floor" @default.
- W1990280260 doi "https://doi.org/10.1121/1.408737" @default.
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