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Circular ring type fiber bragg grating (FBG) temperature sensor and encapsulation method

A technology of temperature sensor and optical fiber grating, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., to achieve low repeatability error, increase wavelength variation, and increase temperature sensitivity

Inactive Publication Date: 2015-12-16
WUHAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a ring type fiber grating temperature sensor and packaging method, which can solve the problem that the linearity between the central wavelength and temperature of the packaged fiber grating is lower than that of the unpackaged state. The problem of linearity between temperatures

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  • Circular ring type fiber bragg grating (FBG) temperature sensor and encapsulation method
  • Circular ring type fiber bragg grating (FBG) temperature sensor and encapsulation method
  • Circular ring type fiber bragg grating (FBG) temperature sensor and encapsulation method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0030] Such as Figure 1 to Figure 4 As shown, a ring-type optical fiber grating temperature sensor includes an optical fiber 11, a grating 5 is arranged on the optical fiber 11, and an elastic deformation body, the elastic deformation body is a ring 1, and through holes 9 are arranged on both sides of the ring 1 And the blind hole 10, the upper and lower sides are pasted with metal sheets for packaging and heat conduction; the through hole 9 communicates with the blind hole 10, and the through hole 9 is covered with a capillary metal tube 4, and the capillary metal tube 4 and the ring 1 The inner wall is fixed (AB glue 3 is used for fixing in this embodiment), the optical fiber 11 is passed through the capillary metal tube 4, and the grating 5 on the optical fiber 11 is located in the center of the ring 1, and the blind hole 10 is filled with glue fo...

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Abstract

The invention provides a circular ring type fiber bragg grating (FBG) temperature sensor, which comprises a fiber. A grating is disposed on the fiber. The circular ring type fiber bragg grating temperature sensor further comprises an elastic deformable body. The elastic deformable body is a circular ring, two sides of the circular ring are provided with a through hole and a blind hole, and lower and upper faces are both attached with metal pieces for encapsulation and conduction. The through hole and the blind hole are connected, the through hole is sleeved internally with a capillary metal tube, the capillary metal tube is fixed with an inner wall of the circular ring, the fiber penetrates through the capillary metal tube, the grating on the fiber is located at the axis of the circular ring, and the blind hole is filled with glue for fixing the fiber. The invention has the advantages of high sensor linearity, high sensitivity and excellent repeatability.

Description

technical field [0001] The invention relates to the technical field of temperature sensing and monitoring, in particular to an annular fiber grating temperature sensor and a packaging method. Background technique [0002] Studies have shown that the change of the central wavelength of fiber gratings is related to factors such as temperature, and there is a linear relationship between wavelength and temperature. Fiber grating has the characteristics of corrosion resistance, anti-electromagnetic interference, light wave communication, and non-electric transmission, so the grating is especially suitable for real-time temperature monitoring in petroleum, chemical, mining and other places that require fire protection and explosion protection. By properly encapsulating the grating, the fiber grating temperature sensor has been gradually applied to various fields. [0003] Bare gratings are generally not directly used in actual engineering sensing measurements because they are eas...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
Inventor 刘明尧张志建彭霜谭跃刚周祖德
Owner WUHAN UNIV OF TECH
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