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设计了一种基于相移光纤布拉格光栅(PSFBG)的应变传感器。将PSFBG和光纤布拉格光栅(FBG)通过光环形器连接在一起,并且沿着中线对称地粘贴在等强度悬臂梁上。两者共同作为探头的核心传感元件。它们粘贴的位置紧靠中线,从而承受着相同的应变,产生携带信息并且线宽极窄的传感光。通过边缘滤波法解调传感光,最终可以获取应变数值。理论模拟了由参数匹配的PSFBG和FBG产生的传感光谱,实验中获得了线宽仅为101pm的传感光,实验结论与数值模拟吻合。在应变探头的实验验证中,解调结果与待测信号的线性关系良好,拟合度为0.994,探头的应变分辨率为1.5με。基于该设计的应变传感器具有高分辨率、低成本、无啁啾等优点,具有很高的实用价值。
A strain sensor based on phase shift fiber Bragg grating (PSFBG) is designed. The PSFBG and Fiber Bragg Grating (FBG) are connected together by an optical circulator and are attached symmetrically along the center line on an iso-strength cantilever beam. The two together as the core of the probe sensor. They are glued close to the midline and are subjected to the same strain, resulting in sensing light with extremely narrow linewidth and carrying information. Through the edge filter demodulation of the sensor light, the final strain value can be obtained. In theory, the sensing spectra generated by PSFBG and FBG with matched parameters were simulated. The sensitized light with a linewidth of only 101 μm was obtained in the experiment. The experimental results are consistent with the numerical simulations. In the experimental verification of the strain probe, the linear relationship between the demodulation result and the signal to be measured is good, the fitting degree is 0.994, and the probe strain resolution is 1.5με. The strain sensor based on this design has the advantages of high resolution, low cost, no chirp and so on, which is of high practical value.