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在透镜加工中,用球径仪测量球面样板曲率半径 R 是根据下式关系,从测量园弧矢高 h 得到的:对凸样板 R=(r~2+h~2/2h)-ρ对凹样板 R=(r~2+h~2/2h)+ρ (1)式中 r——所用测环的半径;ρ——测环上钢球的半径。由上式可知,如果测环半径 r 和钢球半径ρ能满足所测曲率半径的要求,那么被测曲率半径的精度就取决于矢高 h 的测量精度。但是球径仪测量矢高的精度是有限的;而仪器所附的测环数量是一定的(不可能对每一曲率半径都配备一个测环),所以测量曲率半径的时候就必须从仪器现有的测环半径中选用数值最相近的测环。这样,为了保证曲率半径的测量精度,除了要查明矢高的测量误差以
In lens processing, measuring the radius of curvature R of a spherical sample by means of a ball-diameter meter is obtained from the measurement of the height of the circular arc of the circular arc according to the following equation: R = (r ~ 2 + h ~ 2 / 2h) Model R = (r ~ 2 + h ~ 2 / 2h) + ρ (1) where r - the radius of the ring used; ρ - the radius of the ball on the ring. From the above equation, we know that if the radius of the test ring r and the ball ρ can meet the requirements of the measured radius of curvature, then the accuracy of the measured radius of curvature depends on the measurement accuracy of vector h. However, the accuracy of measuring the height of the ball diameter meter is limited. The number of measuring rings attached to the instrument is certain (it is not possible to equip each radius of curvature with a measuring ring). Therefore, when measuring the radius of curvature, The radius of the test ring used in the nearest value of the measured ring. In this way, in order to ensure the measurement accuracy of radius of curvature, in addition to ascertain the measurement error of vector