光纤布拉格光栅传感分析仪

Fiber Bragg Grating Sensor Analyzer

提出了一种基于FPGA与DSP平台的光纤布拉格光栅传感分析仪,将外界参量的变化转化为光纤布拉格光栅波长的偏移,通过数据采集、过滤杂波、信号波峰检测、高斯曲线拟合以及加权波长计算等关键步骤来实现波长解调技术,进而完成温度、应变、压力或位移等对象的在线测量,并且可以实现光纤线路故障分析与定位的功能。实验结果表明:该系统功耗低、线性度好、波长解调精度与分辨率较高。经过长期测试,系统软硬件运行稳定可靠。

Fiber Bragg sensors become research focus of sensing technology,and have been widely used in many applications.This paper proposed a novel fiber Bragg grating sensor analyzer based on FPGA（Filed Programmable Gate Array）and DSP（Digital Signal Processor）platform,which converted external parameter changes into wavelength shift in fiber Bragg gratings.The system can measure real-time temperature,strain,pressure,displacement,and others through key steps including data acquisition,clutter filtering,signal peak detection,Gaussian curve fitting and weighted wavelength calculation to carry out wavelength demodulation.Moreover,it is able to achieve fault diagnosis and positioning of the fiber link.Experimental results show that the system has advantages of low power consumption,good linearity,strong robustness,high precision and resolution on wavelength demodulation.And the system is still stable and reliable after a long test under different conditions.