Research On Fringe Electronical Counting And Subdivision Scheme Of Digital Interferometric Fiber Optic Sensor

Interferometric fiber optic sensor is an important category of fiber-optic sensor because of its high sensitivity. If technology of fringe counting and subdivision of traditional digital sensor is used to measure, the interferometric fiber-optic sensor can measure large phase change and absolute phase change. This paper research on the realizing scheme of the new digital interferometric fiber optic sensor.We have mainly made a study of digital interferometric fiber optic sensor's scheme on theoretical analyse and simulator validating. Through analysing and simulating , it is found that two orthogonal singals obtained from the new scheme completely can be processed by the technology of counting and subdivision of traditional Moire fringe ,if the circuitry parameters are properly selected. A new method of electronical counting and subdivision of fringe signal is provided and is completed by hardware and software matching. A new seuse finding circuit scheme is proposed to match the method of electronical counting and subdivision of fringe signal, simulator validating is performed.The scheme of the new digital interferometric fiber optic sensor is feasible through analysis and simulator validating. It is valuable to the subsequent scheme realization of the digital interferometric fiber optic sensor.