摘要
谐振式光纤陀螺(Resonator Fiber Optic Gyro,R-FOG)是基于Sagnac效应产生的谐振频率差来测量旋转角速度的一种新型光学传感器.对R-FOG数字检测系统中A/D、D/A位数及量化精度进行了研究.在A/D端,利用过采样和低通滤波技术相结合,扩展A/D精度;在D/A端,利用脉冲宽度调制(Pulse Width Modulation,PWM)提高有限位D/A的量化精度.最后将上述方案应用于实际的数字处理专用DSP芯片,利用12位A/D和14位D/A,组建了R-FOG数字检测系统,得到了和理论相类似的解调曲线,在此基础上,初步获得陀螺转动信号.
Resonator fiber optic gyro (R-FOG) is a novel optical rotation sensor whose resonant frequency is changed due to the Sagnac effect. The required bits of analog-to-digital (A/D) converter and digital-to-analog (D/A) converter are researched. During A/D process, combining the over-sampling method with the low pass filtering technique, the resolution of A/D is extended. During D/A process, using PWM, the resolution of D/A can also be improved. These above methods have been adopted in the practical R-FOG digital system. Based on 12 bit A/D and 14 bit D/A, the digital detection system is set up, and then the modulated curve similar to the theoretical curve is obtained. The gyro rotation signal is also observed successfully.
出处
《传感技术学报》
CAS
CSCD
北大核心
2007年第10期2280-2283,共4页
Chinese Journal of Sensors and Actuators
基金
高等学校博士学科点专项科研基金资助(20060335064)
