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提出了一种非接触式结构光测量液面微变形剖面曲线的方法。基于几何透射虚栅变形的原理,推导了液面离面变形与水底虚栅面内位移之间的数学关系。将一张单向几何光栅(频率为1～5line/mm)置于盛有已发生变形的水的透明水槽下方,并在水槽上方布置电荷耦合器件(CCD)相机,记录下因液面离面变形而产生的透射虚栅变形图。使用条纹中心算法对所采集的变形栅图进行细化、赋级和插值运算,可得到该虚栅图的位移矢量场。将之代入所推导的数学关系式中,即可迭代求得液面的离面变形剖面曲线。运用该方法对一分硬币漂浮于水面时引起的液面离面变形剖面曲线进行求解绘制,所测得结果与已有文献的结果相比较相差仅为2%,证明了该方法的有效性和可行性。
A non-contact structured light measurement method of liquid profile micro-deformation curve. Based on the principle of geometric transmission of the virtual grid, the mathematical relationship between the displacement of the liquid surface and the displacement of the virtual grid in the underwater is deduced. Place a one-way geometric grating (frequency 1 ~ 5line / mm) under the transparent water tank containing the deformed water and a CCD camera on top of the water tank to record the liquid surface area Transmission through the deformation of the virtual grid deformation. The stripe center algorithm is used to refine, grade and interpolate the deformed raster image, and the displacement vector field of the virtual raster image can be obtained. Will be substituted into the mathematical relationship deduced, you can iteratively obtain the surface of the liquid surface deformation curve. This method is used to solve the curve of the surface deformation caused by the floating of a coin when it is floating on the water surface. The difference between the measured result and the existing literature is only 2%, which proves the validity of the method and feasibility.