METHOD TO MEASURE ANGLES OF INCLINATION AND HEIGHT OF WATER SURFACE ROUGHNESS RELATIVE TO ITS BALANCED CONDITION Russian patent published in 2011 - IPC G01C13/00 

FIELD: measurement equipment.

SUBSTANCE: method consists in the fact that at least one laser beam is sent along axis Z vertically upwards from underwater position through a certain thickness of water and water surface. Angle of inclination of water surface is defined in the point of ray exit. Laser beam is visualised in the form of mark on the first receiving transparent diffused plate arranged in plane XY above water surface at the distance H₁, and on the second receiving diffused plate arranged parallel to the first one at the distance H₂ from it. Using digital video camera, values of deviations from zero point ΔX₁ and ΔY₁ are registered at the first receiving diffused plate and ΔX₂ and ΔY₂ at the second receiving diffused plate. Then using simultaneously measured deviations ΔX₁, ΔX₂, ΔY₁, ΔY₂, values of appropriate instantaneous values of inclination angles α_x and α_y of water surface are synchronously measured in the selected point, as well as height h of water surface roughness in the same point.

EFFECT: provides for synchronous measurement of height and inclinations of water surface roughness in one point.

3 cl, 5 dwg