Transverse stress sensing system of photonic crystal fiber written with grating and implementing method thereof

A technology of photonic crystal optical fiber and optical fiber sensing system, which is applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of difficulty in lateral stress detection and failure to see photonic crystal optical fiber lateral stress sensing, etc.

Inactive Publication Date: 2006-10-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Transverse stress sensing system of photonic crystal fiber written with grating and implementing method thereof
  • Transverse stress sensing system of photonic crystal fiber written with grating and implementing method thereof
  • Transverse stress sensing system of photonic crystal fiber written with grating and implementing method thereof

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Experimental program
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Effect test

Embodiment 1

[0076] A long-period grating transverse stress (strain) sensing system is introduced into the photonic crystal fiber, a fiber sensing system for detecting transverse stress and strain, which mainly includes a laser light source, an ordinary single-mode fiber, a polarization controller, a zero-birefringence photonic crystal fiber or High birefringence photonic crystal fiber, long period fiber grating, force unit, photodetector, signal processing and display unit. The output light band of the laser light source should be able to cover the resonant wavelength of the long period grating.

[0077] attached figure 1 As shown, the optical fiber in the figure is a photonic crystal fiber with zero birefringence or high birefringence. It is stressed in the pressure unit shown in Figure 4 and forms periodic microbends. 1 is the optical fiber, and 2 is the base of the pressure unit, which has periodic Groove, 3 is the upper cover of the pressure unit, 4 is the position of the optical fi...

Embodiment 2

[0080] Transverse stress (strain) sensing system with Bragg grating written in photonic crystal fiber, a fiber sensing system for detecting transverse stress and strain, mainly includes laser light source, ordinary single-mode fiber, zero birefringence photonic crystal fiber or high birefringence Photonic crystal fiber, Bragg grating, force unit, optical circulator, light detector, signal processing and display unit. The output light band of the laser light source should be able to cover the resonant wavelength of the Bragg grating.

[0081] attached figure 2 As shown, the optical fiber in the figure is a zero-birefringence or high-birefringence photonic crystal fiber, in which Bragg gratings are written; the light is transmitted to the transverse stress detection area through a circulator and an ordinary single-mode fiber, and the light passes through the fiber under the action of transverse stress; The Bragg grating is reflected to the circulator, and output from one port ...

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Abstract

The invention relates to an optical sensing system for detecting the transverse stress strain. Wherein, the laser outputs light to the polarize controller, to be coupled into the zero double refract or high refract photon crystal optical fiber which is marked with long-period grating and inside the forced unit to sense the external transverse stress; the spectrum detector connected to the output detects the transparent spectrum and outputs the detected information to the signal processing and displaying unit to attain the detect result of transverse stress; the output light of laser via the light circulator is coupled into the photon crystal optical fiber of Prague grating; the photon crystal optical fiber is inside the forced unit; the signal light reflected from the Prague grating via the light circulator is output to the spectrum detector to detect the reflect spectrum and output the detected information to the signal processing and displaying unit to attain the detect result of transverse stress.

Description

technical field [0001] The present invention relates to an accurate and sensitive optical fiber sensing system to measure transverse stress or strain, in particular a grating-written photonic crystal fiber based on a grating-written zero-birefringence photonic crystal fiber or a high-birefringence photonic crystal fiber Lateral stress 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 or buildings ...

Claims

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Application Information

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