Demodulation system of fiber Bragg grating sensor based on FPGA

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.