Distributed Fiber Optic Mechanical Vibration Sensor System Performance

With the development of fiber optics, it promotes a wide variety of active and passive fiber optics. At present, almost all of the function of microelectronics devices, can find a similar function device in the optical experimental system. Optical communications, optical sensing and optical information processing have been attracting extensive attention. After 20 or 30 years of development, distributed fiber sensing has successfully achieved the measurement of the optical fiber link thousands of points temperature, stress and other parameters, such sensing technology to monitor areas with extremely sensing big attraction. Optical fiber vibration sensor has also been gradually from the bench "to move to" engineering applications.This paper introduces the development and current research of the distributed optical fiber sensors. State the basis theoretical of the Sagnac type vibration sensor to monitor vibration signal. Using 3*3 coupler demodulation scheme to complete broadband vibration signal demodulation and positioning, respectively homemade mechanical pipeline leak device, PZT signal and generates a signal when people walk around as a broadband source of vibration. By "polarization fading" effect evident in the end of the add-based Faraday rotation mirror Sagnac demodulation and positioning systems, we ues addition of polarization scrambling performance polarizer, research systems in the optical path.We designed for 2 M bandwidth photoelectric detection module. Based on the Lab VIEW development platform realize the simulation of 3 * 3 coupler phase demodulation, and with the help of a data acquisition card, write the demodulation program and demodulation signal by frequency spectrum analysis, filtering and de-noising module implements the positioning of the vibration signal.Given the huge demand for vibration monitoring, distributed optical fiber vibration sensor based sagnac structure has been widespread concern and research, I believe that in the near future will be able to practical use. This article Sagnac sensor has certain reference value for the future research of fence warning, pipeline leakage, hydrophone.