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
CN108680289AInactive Publication Date: 2018-10-19DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Publication Date
2018-10-19
Estimated Expiration
Not applicable · inactive patent

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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.
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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

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
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