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Optical fibre sensor and application thereof to refracting index and strain measurement

A technology of optical fiber sensor and refractive index, which is applied in the field of measurement, can solve the problems that the influence of stress cannot be well eliminated, and the simultaneous measurement of refractive index and stress cannot be realized, and achieve the effects of strong practicability, good mechanical strength, and improved measurement accuracy

Inactive Publication Date: 2009-09-30
JINAN UNIVERSITY
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Problems solved by technology

[0008] None of the above methods can well eliminate the influence of stress on the measurement, nor can it realize the simultaneous measurement of refractive index and stress.

Method used

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  • Optical fibre sensor and application thereof to refracting index and strain measurement
  • Optical fibre sensor and application thereof to refracting index and strain measurement
  • Optical fibre sensor and application thereof to refracting index and strain measurement

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Embodiment

[0068] The fiber gratings used to make side-polished fiber grating sensors are fabricated by phase masking. The length of the grating is 15mm, and the central wavelength of the grating is 1547.76nm. After using the side polishing method of the wheel-type optical fiber, the polishing depth was measured with a filament measuring instrument with a measurement accuracy of 0.1 μm. The measured data are as follows: image 3 , where the abscissa is the axial position of the fiber, in mm, and the ordinate is the remaining thickness of the side-polished FBG, in μm. It can be seen that the length of the polishing area of ​​the side-polished fiber grating is 22mm, the length of the D-type fiber section (the flat part of the polishing area) is 17mm, and the grating area engraved with the grating is located in the middle of the D-type fiber section, ensuring The influence of the outside world on the Bragg wavelength of the side-polished fiber grating is consistent, and the chirp effect is...

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Abstract

The invention relates to the technical field of measurement and discloses an optical fibre sensor and an application thereof in refracting index and strain measurement. The optical fibre sensor is provided with a D-shaped optical fibre segment with D-shaped section on circular optical fibre and is characterized in that the distance between the flat surface of the D-shaped optical fibre segment and fibre core is 1-3 micrometers, and the D-shaped optical fibre segment is marked with Bragg fibre grating. The optical fibre sensor can be used for measuring the refracting index, and can also be used for measuring the refracting index and the strain simultaneously. The optical fibre sensor can better eliminate the stress influence while being used for measuring the refracting index and is especially suitable to monitor the solidifying process of polymer.

Description

technical field [0001] The invention relates to the field of measurement technology. Background technique [0002] Fiber Bragg Grating has been widely used in the field of sensing due to its advantages of lightness, immunity to electromagnetic interference, low cost, and fast sensing response. In recent years, people are studying the method of using fiber gratings to measure the refractive index. Since ordinary fiber gratings are not sensitive to changes in the external refractive index, they need to be processed to reduce the cladding thickness of the fiber grating. When the cladding thickness is reduced to a certain extent, the Bragg reflection wavelength of the fiber grating will change rate changes. Italian scholar Iadicicco et al. and Xue-Feng Huang et al. from Zhejiang University in China respectively reported the method of using corrosion method to process fiber grating and use it for refractive index measurement. Canadian scholar C.F.Chan et al. reported using side...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26G01N21/41G01B11/16
Inventor 陈哲范若岩刘林和肖雅婷
Owner JINAN UNIVERSITY
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