结合光电振荡器的高精度光纤轴向应变传感研究

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(M-Z)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...

Research on High-Precision Optical Fiber Axial Strain Sensor Combined with Optoelectronic Oscillator

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 dual-output 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/με and 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/με and 0.99841, respectively.