摘要
该文提出了利用普通单模光纤作为传感头的结合光电振荡器(OEO)的高精度光纤轴向应变传感系统。通过放大自发辐射宽谱光源(ASE)、双输出马赫曾德尔电光强度调制器(DOMZM)和两段长度不一致的光纤构成的马赫曾德尔(MZ)干涉仪,形成单通带微波光子滤波器,实现OEO腔内的选模。对M-Z干涉仪任意一臂的光纤施加轴向应变,改变干涉仪两臂的长度差,从而改变OEO的输出微波信号频率,达到轴向应变传感的目的。实验结果表明,当轴向应变施加于较长的光纤上时,该传感系统灵敏度为4.67121×10^(-4)GHz/με,线性度为0.99895;当轴向应变施加于较短的光纤上时,该传感系统灵敏度为-4.48388×10^(-4)GHz/με,线性度为0.99841。
A high-precision optical fiber axial strain sensing system combined with optoelectronic oscillator(OEO),using a section of standard single-mode fiber as the sensing head,is proposed and experimentally demonstrated.In the proposed scheme,the mode selection in the OEO cavity is achieved via a single-passband microwave photonic filter which is realized by an amplified spontaneous emission(ASE)light source,a dualoutput Mach-Zehnder electro-optic intensity modulator(DOMZM),and a Mach-Zehnder interferometer(MZI)involving two sections of optical fiber with different length.Through applying axial strain to either arm of the MZI,the length difference between the two arms of the MZI varies.Hence,the frequency of the generated microwave signal in the OEO varies,which is used for axial strain sensing.In the experiment,when the axial strain is applied to the longer fiber,the sensitivity and the linearity are measured to be 4.67121×10^(-4) GHz/μεand 0.99895,respectively.When the axial strain is applied to the shorter fiber,the sensitivity and the linearity are measured to be-4.48388×10^(-4) GHz/μεand 0.99841,respectively.
作者
杨帆
曾珍
章令杰
周晓军
YANG Fan;ZENG Zhen;ZHANG Ling-jie;ZHOU Xiao-jun(School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu,610054)
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2021年第2期272-275,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(61575037)。
关键词
轴向应变光纤传感
双输出马赫曾德尔电光强度调制器
微波光子滤波器
光电振荡器
axial strain optical fiber sensor
dual-output Mach-Zehnder electro-optic intensity modulator
microwave photonic filter
optoelectronic oscillator
