Lateral stress sensing system based on double-mode photon cystal coptical fibre and implementing method

A technology of photonic crystal fiber and transverse stress, which is applied in the direction of transmitting sensing components, cladding optical fibers, optical waveguides and light guides by using optical devices, and can solve the difficulty of sensing and detecting transverse stress of photonic crystal fibers and detecting transverse stress Major and other issues

Inactive Publication Date: 2006-09-13
BEIJING JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

[0015] At present, the research on using PCF for temperature and stress sensing has begun, but because the application of photonic crystal fiber has just started, an

Method used

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  • Lateral stress sensing system based on double-mode photon cystal coptical fibre and implementing method
  • Lateral stress sensing system based on double-mode photon cystal coptical fibre and implementing method
  • Lateral stress sensing system based on double-mode photon cystal coptical fibre and implementing method

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Effect test

Embodiment 1

[0064] Embodiment 1; Zero birefringence dual-mode photonic crystal fiber transverse stress (strain) sensing system;

[0065] attached figure 1As shown, the optical fiber in the figure is a zero-birefringence photonic crystal fiber, and the output light wavelength of the light source (laser) is 633nm. The optical fiber at this wavelength is in a dual-mode working state, supporting fundamental mode and second-order even mode; In the transverse stress detection area, after the polarization controller, only the fundamental mode and the second-order even mode of the x-direction polarization remain; the dislocation is coupled into the photonic crystal fiber, and after the dislocation displacement is adjusted, the power of the fundamental mode and the second-order even mode are nearly equal; The light passes through the optical fiber under the action of transverse stress, and is output to the far-field spot detector (which can be a high-sensitivity CCD array), and the spatial light ...

Embodiment 2

[0066] Embodiment 2; High birefringence dual-mode photonic crystal fiber transverse stress (strain) sensing system;

[0067] attached figure 2 As shown, the optical fiber in the figure is a high birefringence photonic crystal fiber, and the output light wavelength of the light source (laser) is 1310nm. The optical fiber at this wavelength is in a dual-mode working state, supporting fundamental mode and second-order even mode; In the transverse stress detection area, after the polarization controller, only the fundamental mode and the second-order even mode polarized in the y direction remain; the dislocation is coupled into the photonic crystal fiber, and after the dislocation displacement is adjusted, the power of the fundamental mode and the second-order even mode are nearly equal; The light passes through the optical fiber under the action of transverse stress, and is output to the far-field spot detector (which can be a high-sensitivity CCD array), and the spatial light i...

Embodiment 3

[0070] attached image 3 , 4 , 5 are three typical zero-birefringence dual-mode photonic crystal fibers, where the two polarization components of the fundamental mode (attached Figure 7 ) without birefringence, the second-order mode includes four approximately degenerate modes (attached Figure 8 ), the second-order mode transmitted in the actual fiber is composed of these four modes. Therefore, when transmitting in the fiber, the spot direction of the second-order mode rotates randomly. A polarization controller is added to the fiber input end to keep only light polarized in one direction transmitted in the fiber. In this way, only one component of the fundamental mode is transmitted, and only one polarization direction of light can be transmitted in the second-order mode, and the direction of the light spot is no longer rotated. A stable mode field can be formed.

[0071] The external force is applied to the transverse direction of the zero birefringence photonic crystal...

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Abstract

A method for realizing horizontal stress sense based on double mode photon crystal optical fiber includes coupling output light of laser into zero double refraction or high double refraction and double mode photon crystal optical fiber by horizontal dislocation mode after said output light passes through polarization controller, setting double mode photon crystal optical fiber in force receiving unit for sensing horizontal stress exerted from outside, utilizing far field light spot to detect space light field formed by double mode interference for obtaining detection result of horizontal stress. The system for realizing said method is also disclosed.

Description

technical field [0001] The present invention relates to an accurate and sensitive fiber optic sensing system to measure transverse stress or strain, especially transverse stress based on a dual-mode photonic crystal fiber based on a zero-birefringence dual-mode photonic crystal fiber or a high-birefringence dual-mode photonic crystal fiber (Strain) sensing system and implementation method. Background technique [0002] The safety and quality monitoring of buildings is mainly to detect the stress and deformation under the action of external force. The general detection method is to install a large number of distributed strain gauges or other strain-sensing fibers in the building materials. Since the composite structure composed of fiber materials and building materials can properly improve the strength of building materials, the use of composite fiber materials for building loads Deformation detection is a relatively common method. Embed optical fibers in building materials...

Claims

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Application Information

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IPC IPC(8): G01D5/353G02B6/02
Inventor 王智王拥军吴重庆
Owner BEIJING JIAOTONG UNIV
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