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Optical fiber grating self-compensating strain transducer produced by on-line molding process

A technology of strain sensor and optical fiber grating, which is applied in the direction of using optical devices, instruments, measuring devices, etc., can solve the problems of easy creep of grating adhesive process, unreliable combination of grating, easy aging, etc. Reliable, reliable performance, low cost results

Inactive Publication Date: 2009-03-11
SHIJIAZHUANG RAILWAY INST
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  • Abstract
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Problems solved by technology

[0007] The object of the present invention is to provide a fiber grating self-compensating strain sensor made by an online forming process. The automatic compensation of drift can achieve accurate compensation, good working stability, convenient use, reliability, and long life. Short and other questions

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  • Optical fiber grating self-compensating strain transducer produced by on-line molding process
  • Optical fiber grating self-compensating strain transducer produced by on-line molding process
  • Optical fiber grating self-compensating strain transducer produced by on-line molding process

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Embodiment Construction

[0025] see Figure 1 ~ Figure 3 : The fiber grating strain sensor with temperature self-compensation function is provided with a compensation device, and the compensation device is composed of a serial connection between part B 3 and solid body 2, and part B 3 is a metal tube; the optical fiber is a multimode optical fiber, and the fiber grating 4 is a whole Embedded and fixed in the solid body 2, the optical fiber passes through the inner hole of the piece B3. Both the metal outer tube 1 and the part B 3 are metal materials with a positive temperature coefficient. The solid body 2 is a material with a negative temperature coefficient, which is an aramid fiber reinforced resin matrix composite material. The fiber grating 4 is a fiber Bragg grating. The two ends of the compensation pipe are fixed on the fixing frame body. The fixed frame body is a metal outer tube 1 . The two ends of the solid body 2 are fixed on the piece B 3 and the metal outer tube 1 with a two-component...

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Abstract

The invention provides a fiber grating self-compensating strain transducer manufactured by adopting an online molding process, relating to the technical field of temperature transducers. A compensating device is composed of a part B and a solid body which are connected in series, wherein, the solid body is manufactured by adopting the online molding process for embedding and fixing the whole fiber grating in the solid body, and at least one of the cross-sectional area and thermal expansion coefficient of the part B and the solid body is different from each other. The strain transducer has the positive effects that: when the environmental temperature rises or falls, the automatic compensation to grating wavelength temperature drift can be realized by the effect of stress deformation, with precision compensation and good working stability; moreover, the strain transducer also has the advantages of small size, low cost, easy processing, good working stability, convenient use, stability and reliability, and long service life; the molding process of the strain transducer is simple and convenient, the compensation performance can be guaranteed to be reliable, and the problems that grating adhesive process has easy creep deformation, easy aging, unreliable grating combination, short service life and the like in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of temperature sensors. Background technique [0002] Fiber grating is to use the photosensitivity of fiber material to form a spatial phase grating in the fiber core, and its function is essentially to form a narrow-band filter or mirror in the fiber core. Fiber Bragg Grating has the advantages of wavelength coding, easy realization of wavelength division multiplexing, anti-electromagnetic interference, low transmission loss, small size, and light weight. Application prospect. [0003] Fiber Bragg grating is sensitive to temperature and strain at the same time. Generally, it is difficult to distinguish the influence of temperature and strain on sensor wavelength, which seriously affects its application in the field of fiber optic sensing. Therefore, it is necessary to perform temperature compensation on the grating to eliminate the influence of temperature on the wavelength of the grating. [0004] At pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 杜彦良李剑芝孙宝臣刘晨曦
Owner SHIJIAZHUANG RAILWAY INST
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