【摘要】 介绍了法布里-珀罗干涉型光纤水听器的工作原理,指出了工作点的选择依据及系统的实现方案。绘制了理想情况下光纤法布里-珀罗干涉的谐振曲线。用光弹学理论分析了光纤的应力双折射问题和谐振腔内模式分裂问题。用模式分裂的原理解释了水听器的谐振曲线畸变现象,提出了描述谐振曲线畸变的数学公式,用MathCAD软件仿真了模式分裂后水听器的干涉过程并绘制了理论曲线。用实验方法测量并记录了模式简并及分裂条件下各种谐振曲线的形状,通过实验照片与仿真曲线进行对比,理论仿真与实验结果吻合,这说明用光纤模式分裂理论解释谐振曲线畸变现象是可行的。更多还原

【Abstract】 Working principles of Fabry-Pérot optical fiber hydrophone is referred,and the reason for working point choosing and system solution are given.Under ideal circumstance,the resonance curve of Fabry-Pérot optical fiber interference is drawn.Stress birefringence of optical fiber and mode split within resonance cavity are analyzed by photoelasticity theory.With the theory of mode split,the distortion of resonance curve of hydrophone is explained and math formulas describing the distortion of resonance curve are given,and then the interference process of hydrophone after mode split is simulated by MathCAD and the theoretical curve is plotted.The result of experiments is consistent with the theoretical simulation.It shows that it is feasible to explain the distortion of resonance curves by the theory of mode split.更多还原