Phase optical time-domain reflectometer and optical fiber double-pulse difference based perturbation detector

An optical time domain reflectometer, double pulse technology, applied in instruments, measuring devices, using wave/particle radiation, etc., can solve the problems of system instability, contradiction between detection sensitivity and spatial resolution, increase stability, etc. Detection sensitivity, eliminating the frequency instability or frequency drift of the light source, the effect of high spatial resolution

Active Publication Date: 2018-03-30
HARBIN ENG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method to improve the contradiction between the detection sensitivity and spatial resolution of the existing optical time domain reflectometer, which can improve the detection sensitivity and spatial resolution of the system, and overcome the system instability caused by the frequency instability or drift of the light source problem, greatly increasing the stability of the original system based on phase optical time domain reflectometer and fiber optic double pulse differential perturbation detector

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  • Phase optical time-domain reflectometer and optical fiber double-pulse difference based perturbation detector

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Embodiment 1

[0018] The continuous laser output from the ECL laser 1 is input to the input port of the first coupler 2, the input continuous laser is divided into four by the first coupler 2 and the first coupler 2, and the first pump light output from the first output port 2- 1 is input to the first input port of the second coupler 11, and the second pump light 2-2 output by the second output port of the first coupler 2 is input to the third coupler 13, and these two paths will be used as coherent detection. Local oscillator light, the third pump light 2-3 output from the third output port of the first coupler 2 is input to the input port of the first polarization controller 3, and the fourth output port of the first coupler 2 outputs the fourth The pump light 2-4 is input to the input port of the second polarization controller 4, and these two paths will be used as detection light paths, and the third pump light 2-3 enters the first acousto-optic modulator 5 after passing through the firs...

Embodiment 2

[0020] Based on a phase optical time domain reflectometer and an optical fiber double-pulse differential perturbation detector, it includes an ECL laser 1, a first coupler 2, a first polarization controller 3, a second polarization controller 4, a first acousto-optic modulator 5, The second acousto-optic modulator 6, the signal generator 7, the first circulator 8, the symmetric surface core fiber to be tested 9, the second circulator 10, the second coupler 11, the first balanced detector 12, the third coupler 13. Second balanced detector 14, differential circuit 15, low-pass filter 16, high-frequency data acquisition card 17, computer 18;

[0021] The continuous laser output of the ECL laser 1 is connected to the input end of the first coupler 2, the first output port of the first coupler 2 is connected to the first input port of the second coupler 11, and the second output port of the first coupler 2 is connected to the first input port of the second coupler 11. The first inp...

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Abstract

The invention discloses a phase optical time-domain reflectometer and optical fiber double-pulse difference based perturbation detector, and belongs to the field of distributed optical fiber sensing.The perturbation detector comprises an ECL laser, couplers, polarization controllers, acousto-optic modulators, a signal generator, circulators, symmetrical surface core to-be-detected optical fiber,balance detectors, a differential circuit, a low-pass filter, a high-frequency data acquisition card and a computer. Certain pulse width difference is introduced under the pumping of two beams of pulses by using a symmetrical double-core optical fiber, and a problem of the contradiction between the detection sensitivity and the space resolution of the system can be solved to a certain extent through differential processing. Meanwhile, a problem of frequency instability or frequency drift of a light source can also be solved by using a differential detection method so as to acquire a miniaturized optical time-domain reflectometer which is high in detection sensitivity, high in space resolution and good in stability; and the problem of the contradiction between the detection sensitivity andthe space resolution of the original phase sensitive optical time-domain reflectometer is solved, and the space resolution can be improved while high measurement sensitivity is ensured.

Description

technical field [0001] The invention belongs to the field of distributed optical fiber sensing, in particular to a phase optical time domain reflectometer and an optical fiber double-pulse differential perturbation detector. Background technique [0002] In high-risk and sensitive places such as national borders, military bases, power plants, airports, nuclear facilities and prisons, it is urgent to identify intrusion behaviors, such as entering restricted areas, climbing, and climbing over walls, with real-time positioning and large-area coverage. Vibration detection sensor. On the other hand, the environmental special building health detection system includes: safety monitoring equipment that can be applied to long-distance natural gas pipelines, oil pipeline crack monitoring; Vibration sensor for monitoring the strain and leakage distribution of super large or long equipment. The earliest intrusion detector, the phase-sensitive optical time domain reflectometer (Φ-OTDR)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/006
Inventor 吕月兰杨月
Owner HARBIN ENG UNIV
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