反射式光纤测振系统理论分析与实验研究

Theoretical Analysis and Experimental Research on the Reflective Optical Fiber Vibration Measurement System

为了满足微振信号的检测要求,提高检测精度,采用Y型1-7石英光纤发射和接收光信号,设计了一种反射式光纤测振系统。详细介绍了反射式光强调制型光纤测振传感器的工作原理和系统方案,建立光强调制的理论模型,在理论上分析了该系统检测微振信号的可行性。最后搭建了反射式光纤测振系统,通过静态测试找出最佳的静态位移点,在此位移点上进行动态频率范围为100～1 000Hz的动态测试,获取并处理电压信号,进行微振动实验研究。结果表明:该系统能获得良好的实验信号,可以实际检测到微振源的频率信息。

In order to meet the detection requirements of the micro-vibration signals and improve the detection precision,a reflective optical fiber vibration measurement system which employing Y-type 1-7 quartz fibers to transmit and receive light signals was designed; and both working principle and system scheme of the reflective light intensity modulation optic fiber vibration sensor was described and the theoretical model of light intensity modulation was established to analyze the feasibility of detecting micro-vibration signals in the system theoretically. Finally,a reflective optical fiber vibration measurement system was built and the static test was used to find the best static displacement point. At this displacement point,a dynamic frequency range of 100 Hz to 1 000 Hz was used to acquire and process voltage signals and carry out micro-vibration experiments. The results show that,the system can acquire fine experimental signals and can detect frequency information of the micro-vibration source.