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提出了一种新型的基于非均匀光纤布拉格光栅(FBG)精细谱和边沿解调的应变灵敏度增强型传感器。理论研究了在轴向非均匀应变情况下普通FBG的传输谱以及基于传输谱精细结构的应变响应特性。仿真结果表明,将均匀应变转为非均匀应变的新型传感器对应变的灵敏度为普通FBG的4.6倍。在实验上设计制作了这种可将被测物体的均匀应变转换为FBG的非均匀应变以提高应变灵敏度的传感器结构。实验测量结果证明了理论分析的可行性。这种传感器在采用窄线宽激光器的FBG边沿解调方案中具有提高动态应变响应灵敏度以及增大应变测量范围的作用,同时,由于其长度可小型化,在检测高频动态应变信号方面也有较大的应用前景。
A novel strain sensitivity enhancement sensor based on non-uniform fiber Bragg grating (FBG) fine spectrum and edge demodulation is proposed. The transmission spectrum of ordinary FBG under axial non-uniform strain and the strain response characteristic based on the fine structure of the transmission spectrum have been theoretically studied. The simulation results show that the sensitivity of the new sensor that converts uniform strain to non-uniform strain is 4.6 times that of ordinary FBG. The sensor structure that can transform the uniform strain of the measured object into the non-uniform strain of the FBG to improve the strain sensitivity is experimentally designed and manufactured. Experimental results show the feasibility of theoretical analysis. This sensor has the effect of improving the dynamic strain response sensitivity and increasing the strain measurement range in the FBG edge demodulation scheme using a narrow linewidth laser and at the same time has the advantage of being small in size and being useful for detecting high-frequency dynamic strain signals Great application prospects.