| 摘要:谐振式光纤陀螺（Resonator Fiber Optic Gyro，RFOG）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，在小型化和集成化方面具有明显优势。相比于传统的模拟检测技术，数字检测技术具有稳定性好、抗干扰能力强、处理速度快和体积小、易于集成等优势。论文建立了基于单片可编程逻辑器件（Field Programmable Gate Array，FPGA）的数字RFOG系统，在单片FPGA上实现了基于比例积分控制技术的谐振频率伺服回路、用于自动反馈补偿相位调制器由于环境温度等发生变化时引起的2π复位电压漂移问题，以及体现Sagnac频差信号的第二闭环反馈控制回路。最后将研制的基于单片FPGA的闭环数字检测电路应用于实际RFOG系统，顺利验证了上述功能，并实际观测了陀螺转动信号。 |
| 关键词: 光学传感器 谐振式光纤陀螺 闭环锁定 PI反馈 FPGA |
|
| Design and implementation of the digital detection circuit for RFOG based on a single FPGA |
|
|
| Abstract:Resonator fiber optic gyro (RFOG) is a novel optical rotation sensor, whose resonant frequency is changed through the Sagnac effect. Compared to the traditional analogue circuit, the detection system based on a digital circuit has a higher flexibility, smaller size, with the advantages of anti-interference and signal processing. An RFOG with the proposed FPGA-based digital processor is set up. The resonant frequency servo loop based on the proportion integration controller and the automatically compensation circuit for the 2? voltage drift of the phase modulator, as well as the second closed-loop indicating the Sagnac resonant frequency difference are all realized at a single FPGA. Applying the digital detection circuit with the closed-loop operation to the RFOG system, above functions of the FPGA are all verified experimentally. On this basis, the gyro rotation signal is observed successfully. |
| Key words: optical sensor resonator fiber optic gyro closed-loop PI feedback FPGA |