基于倾斜光纤Bragg光栅的横向压力传感器研究  

A transverse strain sensor based on tilted fiber Bragg grating

作　　者：孙婷婷[1] 裴世鑫[1] 李金花[1] 赵立龙[1] 

机构地区：[1]南京信息工程大学物理与光电工程学院,江苏南京210042

出　　处：《光电子．激光》2015年第10期1854-1859,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(11447113);江苏省高校自然科学基金(14KJB140009);南京信息工程大学实验室开放基金(14KF091)资助项目

摘　　要：设计了一种基于4°倾斜光纤Bragg光栅（TFBG）和弹性材料的横向压力传感器。利用TFBG光谱对周围介质折射率响应的特性,实现了对较低压力范围（0～7N）的线性测量。采用快速傅里叶变换（FFT）方法对光谱进行解调,测量灵敏度可达1 920a.u./（N/mm）,线性拟合度为0.998。研究了不同弹性材料对测量灵敏度的影响,实现对测量范围和测量灵敏度的调谐。本文传感器工作在反射光谱方式,易于集成（光栅区长度仅5 mm）,可以植入弹性材料内部用于协调接触压力的测量。Fiber Bragg gratings （FBOs） have been extensively studied and used in optical sensing applica- tions due to their unique advantages. For transverse load sensing, sensors based on FBOs can be fabrica- ted by utilizing the Bragg wavelength splitting generated from the load induced birefringence in the fiber. However,the lateral pressure sensitivity of normal FBGs is too small to offer a good range of applica- tions in comparison to FBC-based axial load sensors. Thus, to improve the performance in small load ap- plications,various FBG variants have been developed. In this paper, a transverse load sensing scheme based on the effect of a conforming elastomer material on the transmission spectrum of tilted fiber Bragg grating （TFBG） is studied and small forces measurement （0--7 N） was demonstrated. Applying a fast Fourier transform （FFT） method,the transmission spectrum can provide sensitivity of 1920 a. u. / （N/ mm） and linearity of 0. 998. Moreover,we focus on minimization of the sensor size as well as the demon stration that the sensitivity in lower load range can be adjusted by properly selecting the conforming ma- terial. The proposed sensor can be implanted into elastic material for conforming contact measurement.

关 键 词：光纤传感器 横向压力传感器 折射率敏感特性 倾斜光纤Bragg光栅(TFBG) 

分 类 号：TN253[电子电信—物理电子学]