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Perimeter protection sensing positioning system based on coherent light time domain reflection

A technology of time domain reflection and sensor positioning, applied in the field of optical fiber, can solve the problems of difficult commercialization and difficult realization of lasers, and achieve the effect of reducing complexity and cost, improving sensitivity, and overcoming measurement blind spots.

Inactive Publication Date: 2012-05-30
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lasers with narrow linewidth and high frequency stability are difficult to realize and therefore difficult to commercialize

Method used

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  • Perimeter protection sensing positioning system based on coherent light time domain reflection
  • Perimeter protection sensing positioning system based on coherent light time domain reflection
  • Perimeter protection sensing positioning system based on coherent light time domain reflection

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Embodiment 1

[0024] The present invention provides a perimeter protection sensing positioning system based on coherent optical time domain reflection technology, such as Figure 4 As shown, the system includes an optical pulse signal transmitter 404, an optical receiver 405, an optical amplifier 406, an unbalanced Mach-Zehnder interferometer 407, and a sensing optical cable 408; wherein, the optical pulse signal is generated in the sensing optical cable backward Rayleigh scattered light, according to the principle of optical time domain reflection, the Rayleigh scattered light carries the information of each point distributed along the sensing optical cable, including the intensity information caused by loss and the phase information caused by external disturbance, using the non-equilibrium Mach- The Zöder interferometer demodulates the phase information to locate the disturbance position.

[0025] In this embodiment, the optical pulse signal transmitter 404 adopts a distributed feedback s...

Embodiment 2

[0032] The present invention provides a perimeter protection sensing positioning system based on coherent optical time domain reflection technology, such as Figure 5 As shown, the system includes an optical pulse signal transmitter 504, an optical receiver 505, an optical amplifier 506, an unbalanced Mach-Zehnder interferometer 507, and a sensing optical cable 508; wherein, the optical pulse signal is generated in the sensing optical cable backward Rayleigh scattered light, according to the principle of optical time domain reflection, the Rayleigh scattered light carries the information of each point distributed along the sensing optical cable, including the intensity information caused by loss and the phase information caused by external disturbance, using the non-equilibrium Mach- The Zöder interferometer demodulates the phase information to locate the disturbance position.

[0033] In this embodiment, the optical pulse signal transmitter 504 adopts a Fabry-Perot (FP) multi...

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Abstract

The invention provides a perimeter protection sensing positioning system based on coherent light time domain reflection technology, which includes a light pulse signal emitter, a light receiver, a light amplifier, a non-balance Mach-Zehnder interferometer and sensing optical cable; wherein, light pulse signal generates backward rayleigh scattered light in the sensing optical cable, according to the light time domain reflection principle, the rayleigh scattered light carries information of each point distributed along the sensing optical cable, the information includes intensity information caused by loss and phase information caused by external disturbance, and the non-balance Mach-Zehnder interferometer which can demodulate the phase information can realize protection alarm and positioning. The invention can be applied for safety detection and positioning of communication line, transfer cable and oil gas pipeline, incursion safety protection for important area and fields of strain, pressure and vibration detection.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and relates to an optical fiber sensing and positioning system, in particular to a sensing and positioning method and structure based on coherent optical time domain reflection technology. Background technique [0002] The distributed optical fiber sensing and positioning system based on optical fiber cable has the ability to simultaneously obtain the measured information that changes with time and space in the area where the monitoring optical fiber cable is laid, and is suitable for the field of distributed interception and detection of long-distance optical fiber cable systems. The sensing system is mainly used to detect and locate stress, strain and vibration. It is safe to carry out intrusion warning and monitoring and provide precise positioning for important areas and targets that need to be protected, such as: military important areas, control areas, various important pipelines and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
Inventor 洪小斌伍剑徐坤左勇林金桐左超
Owner BEIJING UNIV OF POSTS & TELECOMM
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