固胶对光纤线圈热应力干扰双折射的影响

Influence of Coating Adhesive on Thermal Stress Interference Birefringence of Optical Fiber Coil

根据光纤线圈受热应力的实际影响,推导了线圈中因排线引起的光纤挤压应力双折射,并提出利用有限元瞬态热分析的方法研究固胶处理对线圈中热应力干扰双折射的影响。通过对固胶处理前后线圈中典型光纤受热应力的影响的数值模拟计算得出,固胶处理后的光纤线圈存在着一个与胶粘剂参数有关的温度区域,在此区域内线圈受到的应力干扰双折射最小,且温度敏感性降至最低。通过对1000 m保偏光纤线圈的实际测试表明,这一温度区域的消光比指标高于低温段1.5 dB,证明了模型的有效性。提出了固胶材料温度特性与环境温度的匹配性概念。

Based on the actual influence of optical fiber coil received the thermal stress,optical fiber′s crushing stress birefringence in fiber coil is deduced,and the method is proposed,making use of the finite element transient state thermal analysis,to study thermal stress interference birefringence of fiber coil influenced by coating adhesive.Via the simulation computation to the thermal stress disturbance birefringence of typical fiber,the paper concluded that after coating adhesive processing,the fiber coil has a temperature segment that relates to the adhesive parameter,and the thermal stress disturbance birefringence in this segment is smallest,even the sensitivity of temperature change drops to the lowest.Through an actual test to 1000 m polarization maintaining fiber coil,it is indicated that the extinction ratio in this segment is 1.5 dB higher than low temperature section.The match of adhesive material′s temperature characteristic for environment of fiber optic gyroscope is proposed.