基于光子晶体光纤的弱压力传感器研究

Weak pressure sensor based on photonic crystal fibers

摘要: 利用有限元法仿真了光子晶体光纤的双折射与横向压力之间的关系，研究弱压力条件下光子晶体光栅的特性。虽然光子晶体光纤比传统的阶跃光纤对压力更为敏感，但弱压力导致的双折射变化很小，应用测量布拉格波长的变化测量压力的变化比较困难。采用偏振相关损耗来测量外界微弱压力导致的双折射变化。仿真结果表明：利用偏振相关损耗的方法，测量灵敏度可达0.75dB/MPa。

Abstract: In order to analyze the characteristics of photonic crystal fiber under weak pressure,the relationship between the birefringence and the pressure was simulated with the finite element method.The birefringence in photonic crystal fibers is more sensitive than that in conventional step-index fibers,but the birefringence change caused by the weak pressure is less and it is difficult to measure the variation of pressure by Bragg wavelength measurement.The polarization dependent loss was used to measure the birefringence change caused by the external weak pressure.The simulated results show that the measured sensitivity can reach 0.75dB/MPa.