一种路径消扰型全光纤速度干涉仪  

All-Fiber Velocity Interferometer with a Noise Suppression Path

作　　者：凌春[1] 彭和阔 肖倩[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《复旦学报（自然科学版）》2016年第3期342-346,共5页Journal of Fudan University：Natural Science

基　　金：国家重大科学仪器设备开发专项(2012YQ150213);上海市科委科研计划(13231200203)

摘　　要：在使用全光纤速度干涉仪测速时,由光纤传输路径引入的环境噪声会影响速度测量的准确性.提出了一种路径消扰型全光纤速度干涉仪.构建了两个具有完全对称光路结构的传感子系统,其中一个子系统采用传统全光纤速度干涉仪的结构,记录自由面运动和噪声的叠加信号;另一个子系统用于记录噪声信号.同一振动扰动在两子系统中引起的相位移动相同,通过对两子系统测量得到的相位信号做处理,可以实时修正由噪声造成的相位偏差.实验结果表明,该路径消扰型全光纤速度干涉仪能很好地抑制宽频噪声和固定频率噪声对测速结果的干扰.系统对固定频率噪声的抑制能力达30dB,抗干扰能力明显提升,速度测量的准确性得到了提高.Optic fiber path induced environmental noise may cause inferior measurement accuracy in AFVISAR. A special structured AFVISAR system is proposed and demonstrated. Two sensors are structured and integrated into one detection system, while they operated simultaneously. One sensor records noise induced phase-shift, the other measures the velocity information of a moving target. Noise suppression is conducted through real-time signal processing. Result indicates that broadband noise and fixed-frequency noise induced phrase distortion can both be restricted in this new AFVISAR system. Fixed-frequency noise is suppressed by 30 dB. Prominent velocity measurement accuracy is accomplished.

关 键 词：全光纤速度干涉仪 相位调制噪声 噪声抑制 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]