谐振式光子晶体光纤陀螺信号检测及处理技术研究

谐振式光子晶体光纤陀螺是一种具有小型化、高精度等潜在技术优势的新型光纤陀螺,是国内外惯性器件研究的一个重要发展方向。针对谐振式光子晶体光纤陀螺的结构和信号检测原理进行了详细的叙述,确定了基于FPGA的陀螺信号检测总体方案,陀螺信号处理及控制模块主要由频差信号解调、复合拍频检测、闭环反馈控制、数据编码输出以及调制信号模块组成;随后重点介绍了窄线宽半导体激光器的驱动控制方案,在调制解调及频率偏差检测方案上采用数字相敏检波器实现频率偏差检测,在谐振频率闭环跟踪锁定方案上采用数字PI控制器实现环路光频率控制;最后进行了谐振式光子晶体光纤陀螺实验测试系统搭建,以及谐振曲线测试和谐振频率闭环锁定测试。

Research of Signal Detection and Processing in Resonance Photonic Crystal Fiber Optical Gyroscope

With the advantages of its potential capability of realizing high performance and microminiaturization. Resonance Photonic Crystal Fiber Optical Gyroscope (RPCFOG) which is a novel type and promising gyroscope has been widely investigated both at home and abroad. Firstly, the Schematic configuration and signal detection principle of the RPCFOG are demonstrated in detail, high precision signal detect and control unit is confirmed, which consists of resonant frequency biases demodulation module, multiple beat detect module, close-loop feedback control module, data code output module, and signal modulation module; Secondly, driving control scheme of the low linewidth diode laser is proposed, and digital phase sensitivity detector (DPSD) is used to detect the frequency biases based on modulation and demodulation and frequency bias detection scheme, digital proportion integral (PI) controller is used to control the diode laser frequency at resonant frequency close-loop feedback locking scheme; Finally, the RPCFOG experimental setup is established, and resonance curves and resonant frequency close-loop feedback locking process are tested.