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Method for preparing sensor by using polyurethane package fiber grating

A fiber grating, polyurethane technology, applied in the field of optical fiber communication and light sensing, can solve the problems of measurement error, the influence of the temperature center wavelength is not eliminated, the reliability, stability and sensitivity are difficult to meet the engineering requirements, to overcome the problems. Affinity problem, strong overall structure, simple packaging method

Inactive Publication Date: 2018-10-19
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The existing encapsulation technology usually adopts tubular encapsulation of organic polymer and metal jacket, but in actual engineering application, its reliability, stability and sensitivity are difficult to meet the actual engineering requirements; Due to the influence of the central wavelength, there is a certain error in the measured value

Method used

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  • Method for preparing sensor by using polyurethane package fiber grating
  • Method for preparing sensor by using polyurethane package fiber grating
  • Method for preparing sensor by using polyurethane package fiber grating

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with specific examples.

[0025] A method for preparing a sensor with a polyurethane-encapsulated optical fiber grating, using polyurethane as the packaging material, comprising the following steps:

[0026] In the first step, the packaging mold 1 is placed flat on the optical fiber platform 2, such as figure 1 with figure 2 shown. The packaging mold 4 is pre-coated with a release agent. The special packaging mold 1 is a rectangular structure. The packaging mold 1 is provided with a dumbbell-shaped cavity, and the two ends of the spline are rectangular parallelepiped. 6mm, the middle is a connecting strip with a length of 40mm, a width of 3mm, and a height of 3mm. The cavity is left with a threading hole with a length of 5mm and a diameter of 4mm from the edge of the mold; the material of the packaging mold 4 is high temperature resistant polytetrafluoroethylene.

[0027] In the second step, take ...

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Abstract

The invention provides a method for preparing a sensor by using a polyurethane package fiber grating and belongs to the technical field of optical fiber communication and light sensing. According to the method, polyurethane is used as a packaging material. The method comprises a step of fixing a package mold on a fiber platform, peeling a coating of a grating region and allowing the grating regionto enter a capillary steel pipe, fixing a bare fiber on the fiber platform with a clamp to ensure that the fiber is placed at an axis center of the mold, a step of sleeving two ends of the bare fiberwith protective sleeves in order, and a step of pouring the polyurethane into the mold which is coated with a release agent in advance, placing the mold into a vacuum box to be dried and solidified.The fiber grating and a fiber core with the removal of a coating are packaged with polyurethane elastomers to avoid the incompatibility of different materials. The package method of the invention is simple, reliable and portable, the prepared sensor can be monitored by changing the stress, temperature and the like of equipment, the method can be suitable for various industrial applications, and the stability, reliability and sensitivity of the packaged fiber grating are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication and light sensing, and relates to a method for preparing a sensor by polyurethane encapsulating an optical fiber grating, which is used for monitoring stress changes of marine equipment components. Background technique [0002] In recent years, optical fiber gratings have developed extremely rapidly and are playing an increasingly important role in related fields such as optical fiber communication and optical sensing. For sensors made of fiber Bragg gratings as the sensing element, the resonant wavelength of the fiber Bragg grating is related to the period of the grating and the effective refractive index of the mode. When these variables change due to changes in external factors, the resonant wavelength will shift , by measuring the shift of the resonance wavelength, the change of the external physical quantity can be indirectly measured, such as: strain, stress, temperature,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/246
Inventor 孙伟贾子光贾丽芳王振宇
Owner DALIAN UNIV OF TECH
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