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中文摘要：
介绍了一种以光纤布拉格光栅为传感元件的三维测头。测头结构核心为3根悬丝和支架组成的柔性支撑系统，传感系统由3根传感FBG和一根匹配FBG光栅组成。测头的关键参数测定结果为结构复位性精度小于20nm，传感系统重复性小于0．2mV，分辨力小于0．1μm，测力小于5mN。
英文摘要：
A 3-D probe based on Fiber Bragg Grating（FBG） is introduced. The flexible suspension which composed of three molybdenum threads and a plank is the key part of the structure. The sensor system is composed of three sensor FBG and a match FBG. The structure repeatability is less than 20 nm, the sensor system repeatability is 0. 2 mV, the highest resolving power is 50 nm,and the probing force is less than 5 mN.
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The relationship between the minimum zone circle and the maximum inscribed circle and the minimum ci
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