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Optical self-coherent sensing optical path structure, frequency shift change detection method and sensing device

A technology of sensing optical path and sensing device, which is applied in measuring devices, optical devices, thermometers with physical/chemical changes, etc., to achieve the effects of shortened measurement time, simple optical path, and shortened measurement time

Inactive Publication Date: 2020-09-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When the duration of the external influence on the monitoring object is very short, it will not be able to sense and alarm the monitoring object in time

Method used

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  • Optical self-coherent sensing optical path structure, frequency shift change detection method and sensing device
  • Optical self-coherent sensing optical path structure, frequency shift change detection method and sensing device

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Embodiment Construction

[0022] Further describe the technical scheme of the present invention in detail below in conjunction with accompanying drawing:

[0023] Such as figure 1 As shown, an optical self-coherent sensing optical circuit structure includes a circulator 1, a sensing optical fiber 6 connected to the circulator 1, and an interference optical path 7; the sensing optical fiber 6 is provided with preset strain or temperature points 2 and the first measurement point 3, the sensing fiber 6 takes the distance between the preset strain or temperature point 2 and the first measurement point 3 as a step, and realizes distributed strain or temperature sampling on the sensing fiber 6; The interference optical path 7 described above includes two interference arms, the short interference arm 4 and the long interference arm 5, and the length difference between the two interference arms is just equal to the distance between the preset strain or temperature point 2 and the first measurement point 3. As...

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Abstract

The invention discloses an optical self-coherent sensing optical path structure, a Brillouin frequency shift change detection method and an optical fiber dynamic strain or temperature sensing device. The optical self-coherent sensing optical path structure includes a circulator (1) and a circulator (1) A connected sensing fiber (6) and an interference optical path (7); the sensing fiber (6) is provided with a preset strain or temperature point (2) and a first measurement point (3); the The interference optical path (7) includes two interference arms (short interference arm (4) and long interference arm (5), the length difference between the two interference arms is exactly equal to the preset strain or temperature point (2) and the first measurement point ( 3) The distance between the optical signal reflected by the long interference arm (5) at the preset strain or temperature point (2) and the light reflected by the short interference arm (4) at the first measurement point (3) The signal interferes, and the Brillouin frequency shift variation is obtained. The invention effectively shortens the measurement time and realizes fast dynamic strain or temperature measurement.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical self-coherent sensing optical path structure, a Brillouin frequency shift change detection method, and an optical fiber dynamic strain or temperature sensing device. Background technique [0002] Distributed optical fiber sensors not only have the advantages of general optical fiber sensors, such as no radiation interference, good resistance to electromagnetic interference, and good chemical stability, but also can obtain continuous distribution information of the measured field in time and space along the optical fiber. At present, long-distance Raman scattering distributed optical fiber sensors and Brillouin scattering distributed optical fiber sensors Raman scattering is only sensitive to temperature, and it is difficult to be used for health monitoring of geology, building structures, etc., while Brillouin scattering of optical fibers is sensitive to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01B11/16G01K11/322
Inventor 代志勇王大鹏余力
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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