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A multi-parameter optical fiber sensing instrument and sensing method based on multi-core optical fiber

A multi-core optical fiber and optical fiber sensing technology, which is applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve problems such as difficult to meet the needs of use, achieve convenient connection settings, wide application scenarios, and reduce fiber optics. Effect of number of cores

Active Publication Date: 2021-09-21
武汉地震工程研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above application scenarios, it is difficult to meet the needs of using traditional optical fiber sensing technology

Method used

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  • A multi-parameter optical fiber sensing instrument and sensing method based on multi-core optical fiber
  • A multi-parameter optical fiber sensing instrument and sensing method based on multi-core optical fiber
  • A multi-parameter optical fiber sensing instrument and sensing method based on multi-core optical fiber

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Embodiment 1

[0055] Embodiments of the present invention provide a multi-variable amount fiber sensing instrument based on multi-core fibers, such as figure 1 As shown, a grating demodulator 1, a Raman thermometer 2, a polarization analyzer 3, a synchronous trigger circuit 4, and a processor 5, a grating demodulator 1, alam thermometer 2, and said The polarization analyzer 3 is in parallel between the three detecting devices; wherein the laminate thermometer 2 and the latter thermometer 2 and the tipped device 3 in the raster demodulator 1, the Raman Turbiner 2 and the polarization analyzer 3. The polarization analyzer 3 is multiplexed between the polarization analyzer 3, and the raster demodulator 1 and the remaining two devices are time division multiplexed.

[0056] refer to figure 1 The grating demodulator 1, the lamman thermometer 2 and the polarization analyzer 3 each pass through the first fiber interface B1, the front end of the first core A1 in the first core A1, and the polarization ...

Embodiment 2

[0095] Based on the above-described Embodiment 1, the embodiment of the present invention further integrates the portion of the raster demodulator 1, a Raman thermometer 2, and a polarization analyzer 3 in the three detection devices. Another multi-parameter fiber sensing instrument based on multi-core fiber, is more simple, less cost, less cost, and can be achieved with the structure in Example 1 compared to the multi-parameter fiber sensing instrument in Example 1. Function.

[0096] like Figure 9 As shown, the multi-parameter optical fiber sensing instrument provided by the embodiment of the present invention includes a Raman Light Source 601, a polarized light source 602, a fiber grating light source 603, a repository 604, a coupler 605, an annular device 606, a spectroscope 607, a 2Dolder 608, the polarization detector 609, the Stokes photodetector 610, the Anti-Stokes photodetector 611, the grating demodulation device 612, the acquisition card 613, the synchronous trigger ci...

Embodiment 3

[0109] The embodiment of the present invention provides a multi-parameter fiber sensing method based on a multi-core fiber, which can be accomplished using a multi-parameter fiber sensing instrument described in Example 1 or Embodiment 2. Prior to the introduction of the multi-parametric fiber sensing method of the embodiment of the present invention, the calculation formula and its derivation of each sensor technology are first introduced:

[0110] I. Ramano time domain reflection technology (Raman temperature measurement technology)

[0111] For Raman light time domain reflection technology, it is mainly responsive to temperature parameters. Antistoke scattered light is sensitive to temperature, its strength is modulated; and Stokes scattered light intensity has a certain relationship with temperature, but is small affected by temperature. Therefore, in the measurement, the intensity of Stokes scattered light and the anti-Stoke scattering light is required, and the anti-Stark li...

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Abstract

The present invention relates to the technical field of optical fiber sensing, in particular to a multi-parameter optical fiber sensing instrument and sensing method based on multi-core optical fiber. Optical time domain reflection technology senses the first fiber core in the multi-core fiber, and uses polarized light technology to sense the first fiber core and the second fiber core; turn on the fiber grating light source at time T2, and turn off polarization and Raman The light source uses grating technology to sense the first fiber core in the multi-core optical fiber; the data collected by the three technologies are comprehensively processed to determine whether there is disturbance on the entire optical fiber link, and to obtain the current temperature value of the multi-core optical fiber , strain value and vibration frequency value. The invention utilizes fiber grating, Raman and polarized light technologies simultaneously to realize the simultaneous sensing of strain, temperature and vibration, and through wavelength division multiplexing and time division multiplexing, only two fiber cores are needed to meet the requirements of the three technologies. Quasi-synchronous acquisition requirements.

Description

[Technical field] [0001] The present invention relates to the field of fiber optic sensing techniques, and more particularly to multipartic fiber optic sensing instruments and sensing methods based on multi-core fibers. 【Background technique】 [0002] Multi-core fibers are fibers including multiple cores in a single cladding, using multi-core fiber-based space-division multiplexing technologies, can achieve higher density data transmission in optical communication, can also expand in light sensing New use method. It is well known that fiber sensing techniques can generally achieve continuous measurement of each point on the fiber link due to the use of optical fibers, and the sensing distance can reach tens of kilometers. In addition to the common advantages of other fiber sensing technologies, fiber optic sensors also have several special advantages: spatial structural advantages, parameter compensation advantages and channel integration advantages. For example, the plurality of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
CPCG01D5/268
Inventor 冯谦欧进萍唐明梁亚斌张作才
Owner 武汉地震工程研究院有限公司
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