一种基于FPGA的光纤光栅高速解调算法

摘要

为了使光纤光栅在实际工程中得到更广泛的应用，文章提出了一种基于 FPGA(现场可编程门阵列)的光纤光栅高速解调算法及关键技术的实现方法。采用FPGA设计了信号解调硬件平台，通过低复杂度的L-M拟合算法，实现了光纤光栅反射光谱峰值的精确定位，对 L-M算法进行简化处理提高了解调处理速度。实验结果表明，该算法具有较好的稳定性和重复性，在满足高精度测量的同时，还能满足高速实时的要求。%For still wider applications of Fiber Bragg Grating (FBG)in practical proj ects,this paper presents a FPGA-based high-speed demodulation algorithm and the implementation of its key technologies.It designs a signal demodulation hardware platform using the FPGA technology,implemets the accurate positioning of the FBG reflective spectral peak values using the low-complexity L-M fitting algorithm and increases the demodulation processing speed by simplifying the L-M algorithm.The test results show that this algorithm has good stability and repeatability and meets the requirements for high-speed,real-time and highly accurate measurement.