Interference type optical fiber distribution disturbance sensor and disturbance location method thereof
An optical fiber distribution and disturbance positioning technology, which is applied in the direction of using optical devices to transmit sensing components, can solve problems such as affecting the long-distance monitoring disturbance positioning accuracy, reducing the optical signal-to-noise ratio of the interferometer, and reducing the practical performance of the sensor. The effect of positioning failure, low hardware cost, and easy implementation
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[0076] The interferometric optical fiber distributed disturbance sensor proposed by the present invention and its disturbance location method are described in detail below in conjunction with the accompanying drawings and embodiments.
[0077] Such as figure 2 As shown, the interferometric optical fiber distributed disturbance sensor according to an embodiment of the present invention is based on an improved double Mach-Zehnder interferometer structure, which avoids the influence of backscattering, thus avoiding the long-distance monitoring application. Due to the influence of backscattering (mainly including stimulated Brillouin scattering and backward Rayleigh scattering) on signal correlation, it actually avoids the possible problem of poor positioning accuracy or even positioning failure. for long-distance applications. The sensor includes a light source 1 and two detectors, and also includes: a first Mach-Zehnder interferometer and a second Mach-Zehnder interferometer...
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