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SMS传感器结构简单、成本低廉、易于铺设,被广泛的应用于弯曲、位移、温度、应变、折射率等参量的测量,近年来成为研究的热点。本论文利用大芯径多模光纤制作SMS结构以实现高灵敏度的光纤传感结构。首先,将纤芯/包层直径为105/125微米的多模光纤通过单模光纤接入光纤系统,实现SMS光纤结构,通过对多模光纤进行偏轴熔接的手段制作SMS器件结构;然后对单模-多模-单模光纤结构的模式干涉效应和光谱响应特性进行理论分析;最后,借助宽谱光源和光谱分析仪测试了单模-多模-单模光纤结构随应力变化的透射光谱特性,通过对波峰随着应力改变而发生变化的曲线的观察,计算出其灵敏度,发现实验值与理论值基本吻合。
The SMS sensor is simple in structure, low in cost and easy to lay. It is widely used in the measurement of bending, displacement, temperature, strain, refractive index and other parameters and has become a hot spot in recent years. In this dissertation, SMS structure is fabricated by using large core multimode fiber to realize high sensitivity fiber sensing structure. First of all, the multi-mode optical fiber with a core / cladding diameter of 105/125 micrometers is connected to the optical fiber system through a single-mode optical fiber to realize an SMS optical fiber structure, and an SMS device structure is fabricated by means of excursion welding the multimode optical fiber; Mode interference effects and spectral response characteristics of single-mode-multimode-singlemode fiber structures were analyzed theoretically. Finally, the transmission spectra of single-mode-multimode-mode fiber structures with stress were tested by using wide-spectrum light source and optical spectrum analyzer Characteristics of the peak by changing the stress changes with the observation curve to calculate the sensitivity and found that the experimental values and theoretical values are basically consistent.