F-P型光纤水听器温度特性研究

Study on the F-P Optical Fiber Hydrophone Temperature Characteristics

温度漂移对水听器系统输出的影响是其实用化进程中的关键技术障碍。这主要表现在温度变化引起水听器探头背衬材料的胀缩和光纤折射率的变化。首先从弹性力学轴对称问题的准静态理论出发分析了背衬材料的应力特性,并用光弹理论及热应力理论分析了温度改变对光纤相位常数的影响,得出了温度影响干涉式光纤水听器光学相位输出的数学表达式。给出了温度变化对水听器光学相位输出影响的实验测量结果,得出了光学相位随温度变化的线性关系图,与理论计算结果吻合。

The influence of temperature change to the hydrophone system output was the pivotal technical barrier in hydrophone practical application process. This mainly displayed in the temperature change caused the back lining material which constituted hydrophone head expansion or contraction, and changed the optical fiber refractive index. Based on the elasticity theory axial symmetry question quasi static, the back lining material stress characteristics were analyzed. Using photoelastie theory and thermal stress theory, the influence of temperature to the optical fiber phase constant was analyzed. The output mathematical expression of the interference type optical fiber hydrophone optics phase changed by the temperature was ob- tained. The influence of the change of the temperature on the optics phase output was researched. The linear curve was obtained which the optics phase changed along with the temperature.