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Fiber optic pressure sensing method based on Sagnac interferometer

机译:基于Sagnac干涉仪的光纤压力传感方法

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Pressure method using polarization-maintaining photonic crystal fiber (PM-PCF) as sensing element based on Sagnac interferometer is proposed to monitor inter layer pressure in especial compact structure. Sensing model is analyzed and test system is set up, which is validated by experiment. The birefringence can be modified by the deformation of PM-PCF under transverse pressure, realizing pressure measurement by detecting the wavelength shift of one specific valley from output of the Sagnac interferometer. The experiment results show that the output interference fringes were shifted linearly with pressure. The dynamic range of 0 kN ~10kN, sensing precision of 2.6%, and pressure sensitivity of 0.4414nm/kN are achieved, and the strain relaxation phenomenon of cushion can be observed obviously. The sensor has better engineering practicability and capability to restrain interference brought up by fluctuation of environment temperature, which temperature sensitivity is -11.8pm/℃.
机译:提出了一种基于Sagnac干涉仪的保偏光子晶体光纤(PM-PCF)作为传感元件的压力法,以监测特别紧凑结构中的层间压力。分析了传感模型,建立了测试系统,并通过实验验证。可以通过在横向压力下PM-PCF的变形来修改双折射,通过从Sagnac干涉仪的输出中检测一个特定波谷的波长偏移来实现压力测量。实验结果表明,输出干涉条纹随压力线性变化。动态范围为0 kN〜10kN,传感精度为2.6%,压力敏感度为0.4414nm / kN,可以明显观察到垫层的应变松弛现象。该传感器具有更好的工程实用性和抑制环境温度波动带来的干扰的能力,其温度灵敏度为-11.8pm /℃。

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