レーザー光線群による方向スペクトル波計測

概要

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The wave measuring system applying laser beams for wave surface probes were recently developed by Experimental Tank of Yokohama National University. Laser spot projectors are set as the wave probe array under water, and He-Ne laser beams are projected vertically upward from each projectors. Images of laser spots on the wave surface are taken by a video camera, and that video pictures are processed and the digital informations of wave heights or wave slopes are obtained from processed video signals. These measured timeseries converted to the wave timehistories of multi positions by a personal computer in real time, and the directional wave spectrum is estimated by the Maximum Likelihood Method. Moreover the hard copies of 3-D graphs of directional spectra are got immediately. In this paper, principles of these new measuring systems and related numerical calculus are mentioned. And the measured examples in the Experimental Tank of Yokohama National University by these systems are shown. Consequently, these new systems showed the excellent abilities and performances.
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