有一平面样板,如图1所示,样板的非整圆半径为R1.5mm,要求测出R中心至平面的尺寸L,即图中AO之间的距离。通常在工具显微镜上用测角目镜测出尺寸h,再用弓高弦长法或其它方法测量 There is a plane model, shown in Figure 1, the non-circular radius of the template R1.5mm, required to measure the R center to the size of the plane L, that is, the distance between the AO. Usually measured by a goniophotometer on a tool microscope to measure the size h, and then measured by the bow of high chord length or other methods