Abstract
A simple method of measuring underwater sediment surface roughness was tested over a sandy sediment off the west coast of Florida, as part of the Sediment Acoustics Experiment (SAX99). The process was integrated into an acoustic data acquisition system, and allowed roughness measurements of the seafloor without interference with the acoustic data acquisition process. The method employed lasers mounted on a remotely operated vehicle (ROV). Each laser was a red He–Ne class IIIa with output power less than 5 mW. A cylindrical lens was used to spread the laser beam into fan, which was directed downward to produce a stripe on the sediment. Viewing from an oblique angle, the profile of the sediment directly under the stripe is obtained. The information was recorded on videotape, digitized, and processed to obtain roughness statistics. [Work supported by ONR, Ocean Acoustics.]
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