Three-dimensional measurement method and instrument

Abstract

The invention provides a three-dimensional measurement method and instrument. The method comprises the following steps: setting a micro lens array to enable characteristic points of a to-be-measured surface on a workpiece to form a plurality of image points, setting a sensing plane, obtaining a plurality of image points formed on the sensing plane by the characteristic points of the to-be-measured surface on the workpiece, setting a mapping plane, setting a plurality of mapping points, which correspond to the image points one by one, on the mapping plane, setting a refocusing plane, setting a convergence point array, which comprises a plurality of convergence points arranged in an array, on the refocusing plane, connecting the mapping points with the convergence points corresponding to the mapping points to form a plurality of refocusing connecting lines of the characteristic points, enabling the refocusing connecting lines to intersect at a refocusing point, calculating a three-dimensional coordinate of the refocusing point, obtaining three-dimensional coordinates of the characteristics through the calculation according to the three-dimensional coordinate of the refocusing point, and displaying the three-dimensional coordinates of the characteristics. Usage is simple and convenient, and measurement accuracy is high. 本发明提供了一种三维测量方法与仪器，包括以下步骤：设置微透镜阵列使工件上的待测表面的特征点通过微透镜阵列形成多个像点；设置传感平面，获取工件上待测表面的特征点在传感平面上所形成的多个像点；设置映射平面，并在映射平面上设置多个映射点；使多个映射点与多个像点一一对应；设置重聚焦平面，在重聚焦平面上设置会聚点阵列，使会聚点阵列包括阵列排列的多个会聚点；连接映射点与映射点对应的会聚点，以形成特征点的多个重聚焦连线；多个重聚焦连线相交于重聚焦点；计算重聚焦点的三维坐标，并根据重聚焦点的三维坐标计算得到特征点的三维坐标；将特征点的三维坐标显示出来。本发明使用简单方便、测量精确度高。