New method in controlling working point of an interferometric fiber optic sensor

By theoretical and mathematical analysis of the output signal of laser intensity of a fiber optic interferometer,the characteristics and function of the signal are demonstrated essentially.The interferometer demodulation method based on feedback control work point has been designed.Not only the problem of phase shift is settled,but also the method is given which can settle the problems such as wave retroflexion,reset noise of PZT,and optic power fluctuation influencing demodulation results.The results of simulation and experiment are perfect.