Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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, clad optical fibers, optical waveguides and light guides with optical devices, and can solve the difficulty of transverse stress detection and the absence of photonic crystal fiber transverse stress sensing and Detection and other issues

Inactive Publication Date: 2008-06-04
BEIJING JIAOTONG UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, and the detection of lateral stress is relatively difficult, so there is still no lateral stress sensing and detection based on photonic crystal fiber. related reports

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
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 laser light source 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 detection area, after the polarization controller, only the fundamental mode and the second-order even mode of polarization in the x 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; Under the action of transverse stress, it passes through the optical fiber and outputs it to the far-field spot detector (which can be a high-sensitivity CCD array), and converts the spatial light intensity dist...

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 laser light source 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 detection area, after the polarization controller, only the fundamental mode and the second-order even mode of polarization 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; Under the action of transverse stress, it passes through the optical fiber and outputs it to the far-field spot detector (which can be a high-sensitivity CCD array), and converts the spatial light intensity di...

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G02B6/02
Inventor 王智王拥军吴重庆
Owner BEIJING JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com