一种应用于谐振式光纤陀螺的数字双相位锁相放大器的设计  

A Design of Digital Dual-Phase Lock-in Amplifier Applied to Resonator Fiber Optic Gyro

作　　者：张焱[1,2] 唐杰 赵宁[3,2] 张彤[1,3,2] ZHANG Yan;TANG Jie;ZHAO Ning;ZHANG Tong(School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China;School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China;Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology, Suzhou Research Institute of Southeast University, Suzhou Jiangsu 215123, China)

机构地区：[1]东南大学仪器科学与工程学院,南京210096 [2]东南大学苏州研究院苏州金属纳米光电技术重点实验室,江苏苏州215123 [3]东南大学电子科学与工程学院,南京210096

出　　处：《传感技术学报》2018年第1期1-5,共5页Chinese Journal of Sensors and Actuators

摘　　要：针对谐振式陀螺输出频率差信号微弱的特点,设计了一种应用于谐振式光纤陀螺的数字化双相位的锁相放大器,用于检测谐振式光纤陀螺Sagnac效应引起的角速度信号。该锁相放大器无需对参考信号进行相位调整即可实现对待测信号的鉴幅功能,改善系统检测系统的信噪比,实现微弱信号检测。采用数字电路实现该锁相放大器,并将其集成到FPGA上,有利于陀螺小型化和集成化。According to the feature of the weak difference frequency signal of the output of resonator fiber optic gyro,a digital dual-phase lock-in amplifier（ LIA） is proposed to detect the angular velocity signal caused by the Sagnac effect,which needn＇t do a phase adjustment for the reference signal,improve the system signal-to-noise ratio and realize the weak signal detection. The LIA is realized by using digital circuit method and integrated into the Field-Programmable Gate Array（ FPGA）,which is beneficial to the miniaturization of the gyro system.

关 键 词：FPGA 谐振式光纤陀螺 双相位锁相放大器 微弱信号检测 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]