① If the radius of curvature of the ferrule is too large, the grinding pad may be too hard; if the radius of curvature is too small, the grinding pad may be too soft. Qualified connectors require curvature values within standard tolerance ranges. This parameter is vital to ensure proper physical contact between mated connectors. ② If the amount of eccentricity. The principle is to use the Newton ring interference principle to detect the 3D condition of the ferrule end face. Since the fiber itself could be recessed or protruded, the sphericity of apex. The. There are three main aspects to measure the quality of optical fiber end-face grinding: radius of curvature, vertex offset and fiber height, here not specify in detail please refer to article if need: Three Indicators Of Fiber End-face Grinding Quality.
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