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提出了一种基于耦合型双芯光纤级联布拉格光纤光栅的温度与应力双参数解耦测量的全光纤型传感系统。实验制备了一系列不同长度的双芯光纤滤波器,并测量分析了其自由光谱范围与双芯光纤长度的关系,结果与理论基本一致。实验发现双芯光纤及布拉格光栅对施加应力与环境温度的变化具有不同的光谱响应。利用光谱分析仪实时监测双芯光纤透射光谱波谷处波长及光纤光栅透射谱的波长漂移量,方便地实现了温度与应力的解耦双测量。多次测试发现该传感器对应力与温度响应特性具有良好的重复性,波长误差低于实验所用光谱仪分辨率。对于0.01 nm波长分辨率的光谱仪,提出的全光纤型传感器可以分别实现4.3048με及0.4562℃的应力与温度传感测量分辨率。
An all-optical fiber sensing system based on two-parameter decoupling measurement of temperature and stress based on coupled two-core fiber cascaded fiber Bragg grating was proposed. A series of double-core fiber filters with different lengths were experimentally prepared. The relationship between the free spectral range and the length of the double-core fiber was measured and analyzed. The results are in good agreement with the theoretical ones. The experimental results show that the dual-core fiber and the Bragg grating have different spectral responses to the applied stress and the change of the ambient temperature. Using the spectrum analyzer to monitor the wavelength shift of the transmission spectrum trough and the transmission spectrum of the FBG in real time, it is convenient to realize the decoupling dual measurement of temperature and stress. Repeated tests found that the sensor has good stress and temperature response characteristics of the repeatability, the wavelength error is lower than the experiment with the spectrometer resolution. For the spectrometer with 0.01 nm wavelength resolution, the proposed all-fiber sensor can achieve the stress and temperature sensing resolution of 4.3048με and 0.4562 ° C, respectively.