自聚焦共焦光纖傳感器軸向分辨率的影響因素

分析和研究了光纖光斑尺寸、透鏡的數(shù)值孔徑、放大倍率、光纖與透鏡的匹配及裝配等對自聚焦共焦光纖傳感軸向分辨率的影響。指出, 為使系統(tǒng)獲得較高的軸向分辨率, 需控制與光纖光斑尺寸有關(guān)的參數(shù)A ≤3, 選用大放大倍率的自聚焦透鏡, 并使透鏡的數(shù)值孔徑小于光纖數(shù)值孔徑, 同時要保證透鏡與光纖間的精密裝配。
關(guān)鍵詞: 光纖共焦顯微技術(shù); 光纖傳感器; 自聚焦透鏡; 軸向分辨率

Abstract: The effect parameters, such as fiber2op t ical spo t size, the numerical aperture and magnificat ion of a gradient2index lens,match and assembly betw een a gradient2index lens and the fiber on axial reso lu2 t ion of the fiber2op t ical confocalm icro scope. It is po inted that, in o rder to obtain h igh axial reso lut ion, parameter A related to fiber2op t ical spo t should be less than 3, the h igh magnificat ion gradient2index lens should be selected, the numerical aperture a gradient2index lens should less than that of a fiber, and p recision assembly betw een a gradient2index lens and the fiber should be abtained.
Key words: F iber2op t ical confocalm icro scope; F iber2op t ical senso r; Gradient2index lens; A xial reso lu2 t ion