光纤振动传感系统相位调制模块的嵌入式设计

摘要

In order to solve the problem of a lack of portable vibration signal driving device for the test and calibration of optical fiber vibration sensing system,a PZT phase modulation module based on FreeRTOS and STemWin embedded system is proposed in this paper.In this module,STM32 is utilized as the embedded microcontroller and the H bridge power driver is designed to amplify the signal.Multi-task functional component is developed in FreeRTOS embedded operating system and the STemWin graphical user interface is designed,a distributed optical fiber vibration sensing system is then constructed to test the embedded phase modulation module.The experimental results show that the frequency adjustment,duty cycle,output polarity and voltage of the driving signal can be realized by the proposed module.Over a total fiber length of 11.769 km,the shock signal is acquired in real time and the positioning error of vibration signal is within the range of 41 m,which can meet the needs of test and calibration for all kinds of optical fiber vibration sensing system at different positions in a long distance.%针对光纤振动传感系统测试与标定环节缺乏便携式振动信号驱动装置的问题,设计了一款基于FreeRTOS和STemWin嵌入式系统的压电陶瓷相位调制模块.该模块使用STM32嵌入式微控制器,结合H桥功率驱动对信号进行功率放大.利用FreeRTOS嵌入式操作系统进行多任务功能部件开发,并设计了STemWin人机交互界面.随后搭建分布式光纤振动传感系统对嵌入式相位调制模块进行测试,结果表明该模块可实现驱动信号频率、占空比、输出极性和电压的调节,并可在总长为11.769km的传感光纤上对冲击信号进行实时采集,且振动信号定位误差在41m以内,从而可满足各类光纤振动传感系统在长距离不同位置处进行振动测试与标定的需求.