Abstract
A multi-channel optical fiber Fabry-Perot demodulation system based on non-scanning correlation demodulation combining with white light interfered Fabry-Perot sensor is designed.Utilizing cylindrical lens collecting and focusing light as linear light spot and get equivalent inverted image at 2times focal length plane,the corresponding optical model is set up;the optical characteristic analysis and parameter optimization is carried on;and the optical system and embedded demodulation system is designed.A Butterworth filter is used to filter out the background noise on the correlation signal effectively.Experiments based on the prototype demodulator show that the stability is up to 7nm,at the measuring range of 10~40μm,with the resolution of 8nm.The experimental results indicate that the system can achieve real-time measurement,high measurement accuracy,stability and consistency,and can realize multi-point detection and improve the multiplexing capacity.
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