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Fiber grating acceleration sensor with integrated differential structure

An acceleration sensor and fiber grating technology, applied in the sensor field, can solve the problems of reliability, thermal stability frequency response and insufficient sensitivity, and achieve the effect of eliminating thermal influence, simple installation process, and reducing process difficulty.

Inactive Publication Date: 2016-08-10
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of insufficient reliability, thermal stability, frequency response and sensitivity in the application process of optical fiber acceleration sensor, and propose a fiber grating acceleration sensor with integrated differential structure, which solves the problems of reliability improvement and thermal stability Improve the problem, widen the acceleration frequency response range and increase the sensitivity

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  • Fiber grating acceleration sensor with integrated differential structure
  • Fiber grating acceleration sensor with integrated differential structure
  • Fiber grating acceleration sensor with integrated differential structure

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] Such as figure 1 Shown is a fiber grating acceleration sensor with an integrated differential structure. It can be seen from the figure that it includes a support structure (101), an elastic beam (102), a mass (103) and a fiber grating ( 104) the optical fiber (105);

[0021] Connection method: After tensioning the optical fiber (105) with two fiber gratings (104), it is fixedly connected with the two ends of the support structure (101) and the middle point of the mass block (103) with glue points or solder points (106), And make the optical fiber (105) in the central axis position of the support structure (101);

[0022] Acceleration measurement principle: the external acceleration causes the mass block (103) to generate inertial force, and under the joint action of the mass block (103) inertial force and the elastic beam (102) restoring force, the tension ...

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Abstract

The invention relates to a fiber grating acceleration sensor with an integrated differential structure, which belongs to the technical field of sensors. Including a support structure (101), an elastic beam (102), a proof mass (103) and an optical fiber (105) with two optical fiber gratings (104), passing the optical fiber (105) with two optical fiber gratings (104) through Glue or solder joints (106) are tensioned and aligned on the support structure (101) and proof mass (103). Its advantage is that the structure is simple, and the supporting frame, the elastic mass and the mass block are integrated structures, which have the characteristics of high reliability and good thermal stability, and improve the working consistency of the sensor while reducing the difficulty of the process; at the same time, it adopts differential In the measurement method, the tensile stresses of the two fiber gratings are respectively in the state of increasing or decreasing at the same time, and the outputs of the two fiber gratings are subtracted, which can effectively eliminate the thermal influence and double the sensitivity of the sensor compared with a single fiber grating; at the same time, the present invention It also has the characteristics of high frequency response.

Description

technical field [0001] The invention relates to an optical fiber grating acceleration sensor with an integrated differential structure, which uses the optical fiber grating as a sensitive device, and belongs to the technical field of sensors. Background technique [0002] Optical fiber sensing technology began to develop as an emerging technology, and it is also a new discipline and new field that has sprung up in recent years. Due to the outstanding advantages of insulation, anti-electromagnetic interference, and wavelength division multiplexing, fiber optic sensors have become sensors of great concern for special environments and large-scale engineering structure measurements. The acceleration sensor in the general engineering field is a piezoelectric acceleration sensor, which is more sensitive to insulation and electromagnetic interference in use, and the wires used also have obvious restrictions on long-distance measurement. Focus on technology hotspots, among which th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/03
CPCG01P15/03
Inventor 薛景锋刘春红张毅翔
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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