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中文摘要：
光纤的涂敷层和护套采用的材料不同于纤芯材料,其在起到保护光纤的同时,也会对光纤的传感性造成一定的影响.为能准确测量结构的应变,从细观力学的角度建立了铺设在结构中的具有二层保护介质的分布式光纤传感器的理论模型,分析了涂敷层、护套的剪切模量和半径对分布式光纤应变检测结果的影响,比较了不同铺设长度下光纤的传感规律,提出了降低保护介质对光纤应变传感影响的方法.
英文摘要：
The coating and jacket of an optical fiber provide protection against brittle fracture. However, due to the stuff differentia, the existing of the coating and the jacket imposes influence on the sensitivity of the optical fiber to some extent. In order to accurately measure the strain applied on a structure, a theoretical model of distributed fiber optic sensor with coating and jacket is established from the view of microscopic mechanics. The influences affected by shear modulus and radius of the coating and jacket on the distributed strain measurement are analyzed based on this model, and the fiber strain sensing law was compared with different length of laid fiber Some methods used to reduce the effect of coating and jacket on the strain measurement are presented in the end.
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