Abstract: In order to achieve the low-cost, high speed and high precision fiber grating sensing demodulation, the paper designs a fiber grating sensor demodulation system based on FPGA. The system includes the data collection and A/D module, the FIR digital filter module, the data cache module based on SRAM and the display module. The system provides a global system synchronization clock by the FPGA control module for each sub module. Compared with the conventional fiber Bragg grating sensor demodulation device based on FPGA， the required components of design are in the same piece of FPGA development board. It not only reduces costs but also improves the tone of the instrument system integration. By system experimental verification, the fiber grating sensor demodulation system based on FPGA is successful. Last, an application is proposed about the system, it shows the system has certain practical significance.
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Key words: FPGA, signal acquisition, fiber Bragg grating sensor, demodulation system