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High-performance distributed optical fiber sensing system based on Hz EHz ultrafast pulse scanning

A technology of distributed optical fiber and sensing system, which is applied in the use of optical devices to transmit sensing components, convert sensor output, measure optics, etc., to achieve the effect of improving the frequency response range

Active Publication Date: 2019-08-23
LASER RES INST OF SHANDONG ACAD OF SCI
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Problems solved by technology

However, at present, OFDR technology is mainly used for static measurement, and the dynamic measurement of disturbance signal is still in the research stage

Method used

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  • High-performance distributed optical fiber sensing system based on Hz EHz ultrafast pulse scanning
  • High-performance distributed optical fiber sensing system based on Hz EHz ultrafast pulse scanning
  • High-performance distributed optical fiber sensing system based on Hz EHz ultrafast pulse scanning

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Embodiment Construction

[0047] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0048] At present, the use of OFDR technology for static measurement has been relatively mature, but for the measurement of high-frequency disturbance signals, there is no relatively complete system for measurement. Based on this problem, this example provides a high-performance distributed optical fiber sensing system based on Ahtz ultrafast pulse scanning, which can realize the demodulation of...

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Abstract

The application provides a high-performance distributed optical fiber sensing system based on Hz EHz ultrafast pulse scanning. When performing disturbance signal testing, the internal variable-frequency pulse light emitted by the Hz EHz ultrafast pulse scanning laser enters the sensing optical fiber through a circulator, a backward Rayleigh scattering signal emitted by the sensing optical fiber enters an unbalanced Michelson interferometer through a coupler, the backward Rayleigh scattering lights at the arm length location of two adjacent interference arms are in interference one by one by designing the arm length arm of two interference arms; therefore, the signal received after passing through the unbalanced Michelson interferometer contains a phase difference signal caused by an external disturbance signal on the sensing optical fiber; and finally, a phase demodulation unit is used for demodulating the change of the relative phase difference signal along with the time, and then thedynamic measurement on a disturbance signal in the sensing optical fiber can be realized. And meanwhile, the Hz EHz ultrafast pulse scanning laser can effectively realize the simultaneous monitoringin the long distance, high-frequency band signal and high-space resolution.

Description

technical field [0001] The present application relates to the technical field of distributed optical fiber sensing, in particular to a high-performance distributed optical fiber sensing system based on Ahtz ultrafast pulse scanning. Background technique [0002] Since the distributed optical fiber sensing technology can realize the continuous sensing and measurement of the measured physical quantities distributed along the length of the optical fiber, it can integrate the sensing and transmission functions, and can not only complete the spatial distribution of the distributed environmental parameters along the entire length of the optical fiber. , The continuous measurement of time multi-dimensional distribution state information can also transmit the distributed measurement information to the information processing center in real time and non-destructively. At the same time, the sensing system based on distributed optical fiber sensing technology has simple structure, conven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35387G01D5/35325G01D5/35361G01D5/266G01J2009/0284
Inventor 尚盈王晨王昌倪家升赵文安李常曹冰黄胜王英英武延彬
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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