Measurement precision of cavity length of fiber Fabry-Perot sensors depends on the resolution of the demodulation system.Existing demodulation systems often have a resolution of greater than 10nm,which is difficult to measure changes in cavity length beyond 10 nm.Aiming at this issue,a demodulation system based on 7 450 pixel linear array image sensor is proposed,which improves the quality of feature signals through hardware design and software algorithms,completes cavity length data extraction,and implementes a high-resolution fiber Fabry-Perot sensor demodulation system.The experimental results show that the system achieves an optical resolution of 2.7 nm and an precision of 0.013 5％FS within the cavity length measurement range of 0～20 μm.
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