应力双折射对FBG传感器压力传感特性的影响  

Effect of Stress Birefringence on Characteristics of FBG Pressure Sensing

作　　者：王宏亮[1] 乔学光[1] 周红[1] 赵大壮[1] 尉婷[1] 刘颖刚[1] 

机构地区：[1]西安石油大学理学院,陕西西安710065

出　　处：《光电子．激光》2005年第4期395-398,共4页Journal of Optoelectronics·Laser

基　　金：国家"863"计划资助项目(2002AA313150);国家自然科学基金资助项目(60177028)

摘　　要：针对光纤布喇格光栅(FBG)发生弯曲应变实现压力(应力)传感检测的实际情况,对FBG与衬底材料全粘附和两点粘附耦合对压力传感特性影响进行了对比实验研究.结果表明,全粘附耦合会对传感器输入与输出响应特性产生较大的非线性影响,这种非线性影响主要来源于应力双折射、应力梯度等引起的谱展宽干扰.由实验结果得出,在压力为0～4 N测量范围内,采用全粘附耦合引起的FBG反射光谱的展宽约为0.28 nm;采用两点粘附耦合后,谱宽不随压力而变,而线性度较之全粘贴耦合时提高了1.89%.The sensing and the testing on the pressure in a state of the fiber Bragg grating (FBG's) bend strain were realized, and the effect of using overall affix and two-spot affix between the FBG and underlay on the characteristics of the pressure sensing was compared both experimentally and theoretically. Our analysis found that the bigger nonlinearity effect caused by overall affix on the characteristics of output to input of the sensor can be produced, and the nonlinearity effect caused by the spectral width is expanded due to the stress birefringence and the stress grads etc. The experimental results show that the spectral width caused by using overall affix is 0.28 nm, and the linearity of using two-spot affix increases by 1.89%.

关 键 词：应力双折射 传感特性 FBG传感器 压力 光纤布喇格光栅 非线性影响 对比实验研究 传感检测 弯曲应变 衬底材料 响应特性 应力梯度 测量范围 反射光谱 耦合 粘附 线性度 展宽 干扰 谱宽 

分 类 号：TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]