分布式光纤传感器中的数据处理系统

Data Processing System in Distributed Optical Fiber Sensors

在双光纤结构的分布式光纤传感器中,两路回波中的目标信号往往有着极短的时间差,而且信号与噪声频谱重叠,这就要求处理系统速度要高,而且能够根据信号的变化而改变自身的滤波特性。本文设计了独特的基于双DSP的高速数据处理系统,它区别于传统的ADC+FIFO+DSP数字处理方案,十分有效解决以上难题。

In a distributed optical fiber sensor with two optical fibers, the same target can be detected by the two fibers. The time between the two signals in backward wave, which respond the same target, is so short. And the target signal and noise have the same frequency band. Wherefore, speed of the processing system should be high, and should have ability to change its filter character as the signal chan ges. A new system is designed based on two DSPs , which is different with the traditional digital data acquisition system model ADC＋FIFO ＋DSP. And the above problem has a good solution with the new system.