Demodulation system of fiber Bragg grating sensor based on FPGA
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摘要: 针对目前光纤光栅传感器解调设备存在的问题，研究设计了更低成本、便携化、性能稳定的传感器解调设备。选择系统集成度高与环境适应性强的线阵CCD光谱成像法作为解调设备整体方案，以SOPC作为嵌入式解调内核，构建传感器解调系统，并通过实验证明，高斯拟合和频谱相关算法的解调精度较高，平均偏差在0.005 0 nm以内，分别为0.003 0 nm和0.004 8 nm，有效提高了光纤光栅传感器中心波长的解调分辨力，同时也证明设计的基于FPGA的光纤光栅传感器解调系统实现了高集成度、高分辨率的解调系统要求。Abstract: In view of the present existing problems of fiber grating sensor demodulation equipment, a portable sensor demodulation equipment with lower cost and stable performance was studied and designed. The linear charge coupled device (CCD) spectral imaging method with high integration and strong adaptability to environment was selected to be the overall plan for demodulation equipment. The sensor demodulation system was established with the SOPC as the embedded demodulation kernel. And the experiments were carried out and results prove that the Gaussian fitting algorithm and spectrum correlation algorithm can get high demodulation accuracies, the average bias is within 0.005 0 nm,that is, 0.003 0 nm and 0.004 8 nm,respectively, the center wavelength demodulation of fiber bragging sensor resolution is effectively improved;moreover,the fiber grating sensor demodulation system based on field programmable gate array (FPGA) can satisfy the requirements of high integration and high resolution for demodulation system.
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Keywords:
- FPGA /
- SOPC /
- fiber Bragg grating /
- Gaussian fitting /
- spectrum correlation
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