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Multi-point localizable distribution-type optical-fiber vibration sensor based on polarization-state differential detection

A distributed optical fiber and vibration sensor technology, which is applied in the direction of transmitting sensing components, instruments, measuring devices, etc. by using optical devices, can solve the problems of inability to accurately locate multiple vibration points at the same time, achieve high positioning accuracy, high detection sensitivity, and effective The effect of fewer source devices

Inactive Publication Date: 2012-12-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] However, in the existing technologies applied to distributed vibration sensing, there is a common problem that it is impossible to accurately locate multiple vibration points at the same time

Method used

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  • Multi-point localizable distribution-type optical-fiber vibration sensor based on polarization-state differential detection
  • Multi-point localizable distribution-type optical-fiber vibration sensor based on polarization-state differential detection

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Embodiment Construction

[0018] The present invention proposes a distributed optical fiber vibration sensor that realizes simultaneous positioning of multi-point vibration sources based on polarization state differential detection, according to figure 1 Build the entire sensing system, the optical fiber link module and the connection diagram with other modules are as follows figure 2 shown. The pulse laser emits laser pulses with a certain pulse width and period. The wavelength of the light pulse is 1310nm or 1550nm. The pulse width of the detection light emitted can be changed under the control of the embedded computer. Through the polarization controller, the polarization state of the output light pulse of the laser light source is controlled, which reduces the power loss caused by polarization and the power fluctuation caused by the random polarization state change of the light source. The input signal is converted into linearly polarized light with a definite polarization state through a polariz...

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Abstract

The invention discloses a distribution-type optical-fiber vibration sensor which is based on polarization-state differential detection and can localize multiple points of vibration sources, and the sensor is characterized in that on the basis of the traditional optical time domain reflectometer, a polarization beam splitter is used for detecting a polarization state of backward scattered light in sensing optical fibers, two beams of orthogonal polarization light which is outputted by the polarization beam splitter are respectively photoelectrically converted by two photoelectric detectors, then differential operation and amplification processing is conducted for two detected signals, the signals are sampled by an analog / digital (A / D) converter, and the sample is sent into an embedded computer to be data analyzed and computed so as to realize the precise localization of the vibration sources which are distributed along the axial direction of the optical fibers. Due to adopting the multi-point localizable distribution-type optical-fiber vibration sensor, the simultaneous localization of multi-point weak vibration sources which are distributed along the axial direction of the optical fibers can be realized. The multi-point localizable distribution-type optical-fiber vibration sensor is simple and reliable, easy to implement and maintain and suitable for the detection and precise localization of the weak vibration signal sensed by the long-distance laid optical fibers.

Description

technical field [0001] The invention relates to a design method and realization of a distributed optical fiber vibration sensor, and belongs to the technical field of optical fiber sensing, in particular to a distributed optical fiber vibration sensor that realizes multi-point vibration source positioning based on polarization state differential detection. Background technique [0002] For oil and gas pipeline leakage detection, security perimeter protection, structural health inspection and other application requirements, vibration disturbance detection and positioning are the most effective methods to achieve early warning and forecasting. In these applications, the detection and positioning of vibration disturbance requires real-time monitoring of a continuous large-scale space, which is beyond the capabilities of traditional sensors. The distinctive feature of distributed sensing technology is that every point on the optical fiber can be used as a sensing element. Theref...

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Application Information

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IPC IPC(8): G01H9/00G01D5/34
Inventor 代志勇朱燕彭增寿刘永智
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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