Three-dimensional reconstruction method of micro-amplitude waves on free liquid surface

Abstract

The invention relates to a three-dimensional reconstruction method of micro amplitude waves of a free liquid surface. The three-dimensional reconstruction method is characterized by comprising the following steps of: arranging a reference image on the bottom surface of a laboratory tank; vertically and downwardly shooting images of the reference image underwater before and after liquid surface fluctuation from the upper side of the liquid surface by utilizing a camera or a digital CCD (Charge Coupled Device); with the image in the static water before fluctuation as a first frame image and theimage after liquid surface fluctuation as a second frame image, carrying out cross-correlation analysis by utilizing a particle image velocimetry technology to obtain the distortion quantity of the image after the liquid level fluctuation; obtaining the entire wave slope values of the free liquid surface through calculation of the distortion quantity; and obtaining the surface wave amplitude of the free liquid surface through the numerical integration of the wave slope values. According to the invention, a simple and effective whole measurement measure is provided for the minimum-amplitude fluctuation of the free liquid surface under a laboratory environment, meanwhile, the instantaneous whole fluctuation can be obtained. The invention has the advantages of simple equipment, convenience for operation, high application flexibility and low measurement cost.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows us to measure very tiny changes over an area that are difficult or expensive to access with traditional methods like measuring pressure from water level sensors attached to piping systems. It offers a simpler way to study these minute variations without having to move them around frequently during testing.

Problems solved by technology

This patented technical problem addressed in this patents relates to measuring the depth or volume of liquids without being affected from waves that may be caused by other factors such as temperature changes or pressure variations during use. Lasers have been widely utilized due their ease of operation and low costs compared to traditional techniques like ultrasonics. However, they can provide limited data on minute levels of change over short periods of time (less than one second).

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