The Application Research And Simulation On Digital Processing Technology Of Sensor Detecting System

Since the first demonstrations of fiber optic sensors in the late 1970s,the technology has been a considerable amount of development. This development has been driven by principally military applications and has been supported by the enormous advances in optical component technology, which have arisen from the requirements of the telecommunications industry. Now the study has turned into application systems from theories, even some productions have come out in some fields.PGC(phase generated carrier) digital demodulations of Optical fiber sensors have become the development trend in practical applications, because they have many advantages, such as the resisting of DC drifting, simple structure, easy processing in array etc.The dissertation discusses the PGC homodyne detection technique of interferometric fiber-optic sensors in detail, and the key techniques of PGC digital realization is mainly analyzed. It points out the relationship between trend-effect and numerical integration based on the research of trend in the fixed point applications, and puts forward three methods of de-trend. Finally it compares and evaluates them with each other in different processing node.This research analyses the key techniques in the field of fiber-optic sensors detecting digital processing application, and the reason of the overflow problem in practical fixed point demodulation system. It also tests and verifies the effect performance of de-trend in the numerical integration with the help of Simulink. Aiming at the practical application of the algorithm, the paper puts forward some improving suggestions on the hardware design and software programming.