Device for point measurement of the height of an agitated mass of water, in particular swell

摘要

The invention relates to an optical measurement device arranged above the water and comprising a laser emitting a light beam 5a which strikes the surface of the water 8, forming thereon a light spot O, and a camera whose optical axis 6a, directed towards the average position of the said light spot, makes a fixed angle with the laser beam, and which supplies an output signal conveying the deviation of the image of the spot formed on its sensitive surface with respect to its optical axis, this signal being processed so as to deduce therefrom by computation the variable height of the spot on the surface of the agitated water. <IMAGE>