针对光纤敏感环本征频率测试过程复杂且结果精度较低的问题,设计了一种基于MCU+FPGA的检测系统。首先概述了系统构成;然后详细介绍了硬件设计,包括光路设计和电路设计;接着论述了软件设计思想和实现方法,包括时序控制、信号调制、信号解调和数据解析,给出了软件流程图。最后用该检测系统对光纤敏感环进行测试,输出精度为62 Hz,优于已有测试方案,表明光纤敏感环本征频率检测仪硬件和软件设计合理有效。

According to the cumbersome and imprecise in measuring the FOG Loop eigenfrequency, one kind of tester is designed based on MCU+ FPGA. Firstly, the structure of system is introduced. Afterward, the design of hardware is expatiated, which includes optics and circuit. Then the design idea and realizing method of software are discussed, which includes timing control, signal modulation, signal demodulation and data processing. Later, the software flow chart is given. Lastly, one FOG Loop is applied in this detector which shows that accuracy is about 62 Hz, this system is more accurate compared with existing scheme. It is proved that the design of hardware and software is valid.