Contours of slopes of a rippled water surface.

Optics express

PubMedID: 21996820

Cox C, Zhang X. Contours of slopes of a rippled water surface. Opt Express. 2011;19(20):18789-94.
The appearance of a horizontal array of linear lamps below the water surface when viewed from above is approximately in the form of contours of one component of the water surface slope. The degree of approximation is a fraction of one percent when this method is used to describe the slopes of a wind ruffled surface. An extension of the method to image both components of slope requires two arrays of lamps pulsed alternately and in synchronism with a fast camera.