EVA增敏的光纤光栅径向压力传感特性研究  

Study on Radial Pressure Sensing Characteristics of EVA Sensitivity Enhanced Fiber Grating

作　　者：刘丰[1,2] 马文龙[1] 郭璇[1,2] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004 [2]河北省特种光纤与光纤传感重点实验室,河北秦皇岛066004

出　　处：《光学学报》2015年第10期43-51,共9页Acta Optica Sinica

基　　金：国家自然科学基金科学仪器基础研究专款项目(51027003);河北省自然科学基金(F2013203252;F2015203270)

摘　　要：提出了一种采用乙烯-醋酸乙烯共聚物（EVA）封装增敏的光纤光栅径向压力传感方案,将光纤光栅用EVA材料和方钢封装成半哑铃型传感单元,利用有限元软件对结构体受力分布进行了仿真,理论分析了传感单元在径向压力作用下的响应特性,并建立实验系统对光纤光栅径向压力传感特性进行验证。研究结果表明：当径向压力在0~0.3 N范围内时,封装后的光纤光栅对径向压力响应具有很好的线性度;对径向压力的灵敏度相对于裸光栅提高了100.74倍,经匹配法解调后,系统的灵敏度最高可以达到0.94 nm/N;对于解决微小径向应变精确测量的实际工程需求具有重要的参考意义。A novel fiber grating radial pressure sensitivity enhanced scheme, which is encapsulated with ethylene- vinyl acetate copolymer （EVA）, is presented. The fiber grating is encapsulated into a half dumbbell-shaped sensing unit with EVA material and square steel. And the structure stress distribution and radial pressure response characteristics of the sensor are calculated theoretically with finite element software. Finally, an experiment system is established for verifying the sensing characteristics of the sensitivity enhanced optic fiber grating radial pressure sensors. The experiment results show that when the radial pressure is ranged from 0 to 0.3 N, the encapsulated sensors have excellent linearity to radial pressure. And the sensitivity is 100.74 times higher than that of naked optical fiber grating. Further more, after demodulation with the matching method, the sensitivity of the system can be up to 0.94 nm/N. The research results have an important reference significance for solving the practical engineering requirements for accurate measurement of micro radial strain.

关 键 词：光纤光学 光纤光栅 径向压力 匹配法解调 聚合物封装 

分 类 号：TN29[电子电信—物理电子学]