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提出了一种基于马赫-曾德尔干涉的温度和应变双参数同时测量的光纤传感器,其结构是在单模光纤(SMF)上分别熔接两个球形结构并在SMF光纤中间熔接一段细芯光纤(TCSMF)。利用光纤的纤芯模、包层模对温度、应变的灵敏度差异,通过检测不同级次的干涉谷的特征波长位移变化,结合敏感矩阵实现了对温度、应变双参数的同时测量。实验选取位于波长1 545.1nm和1 554.8nm处的干涉谷进行温度和应变的同时测量,测得两个波谷的温度灵敏度分别为53.86pm/℃和47.51pm/℃,两个波谷的应变灵敏度分别为0.75pm/με和1.39pm/με,并且不同级次干涉波谷的波长位移量与外界温度和应变具有良好的线性度。
An optical fiber sensor based on Mach-Zehnder interferometry, which can simultaneously measure two parameters of temperature and strain, is proposed. The structure of the fiber sensor is that two spherical structures are respectively welded on a single mode fiber (SMF), and a fine core fiber TCSMF). Based on the sensitivity difference between the core mode and the cladding mode of the optical fiber to temperature and strain, the simultaneous measurement of temperature and strain double parameters by detecting the characteristic wavelength shift of the interference valley at different levels and the sensitive matrix is carried out. The experimental results show that the temperature sensitivities of the two troughs are 53.86pm / ℃ and 47.51pm / ℃, and the strain sensitivities of the two troughs are respectively 0.75pm / με and 1.39pm / με, and the wavelength shift of different levels of interference wave trough has good linearity with the outside temperature and strain.