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High-sensitivity FBG (Fiber Bragg Grating) acceleration sensor

An acceleration sensor, high-sensitivity technology, applied in the direction of acceleration measurement using inertial force, can solve the problems of grating axial strain grating pull-off, one sensitivity problem, chirp or multi-peak, etc., to improve sensitivity and avoid central wavelength The effect of chirping or broadening, of great practical significance and value

Inactive Publication Date: 2013-01-30
ZHEJIANG COLLEGE OF CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the existing fiber grating acceleration sensor is used, it is prone to chirp or multi-peak phenomenon, and its sensitivity is a problem
And when the external impact is too large, the excessive acceleration will cause a large axial strain on the grating and the grating will be broken

Method used

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  • High-sensitivity FBG (Fiber Bragg Grating) acceleration sensor

Examples

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Embodiment

[0018] Example: such as figure 1 As shown, a high-sensitivity FBG acceleration sensor includes a base 1, an upper cover 2. The base 1 and the upper cover 2 are connected by screws, and the space formed by the base 1 and the upper cover 2 is provided with a cantilever beam 4, One end of the cantilever beam 4 is threadedly connected with the base 1, and the other end is threadedly connected with the mass 3. The mass 3 is in a suspended state. There are two support blocks on the cantilever beam 4, and the support block 5 is provided on the cantilever beam 4 and the base. At the connecting end of base 1, support block two 6 is set between support block one 5 and mass block 3. There are optical cable connectors 7 on both sides of base 1, and optical fiber 8 passes through two optical cable connectors 7 and is fixed to support block one 5 and On support block two 6, the grating grid region 9 is located between support block one 5 and support block two 6. Because the sensor is used fo...

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Abstract

The invention relates to a high-sensitivity FBG (Fiber Bragg Grating) acceleration sensor; and the high-sensitivity FBG acceleration sensor comprises a base and an upper cover, wherein the base is connected with the upper cover by a bolt; a cantilever beam is arranged in a space formed between the base and the upper cover; one end of the cantilever beam is connected with the base by a thread; the other end of the cantilever beam is connected with a mass block by a thread; the mass block is in an impending state; two supporting blocks are arranged on the cantilever beam; one supporting block is arranged at the end of the cantilever beam connected with the base; the supporting block II is arranged between the supporting block I and the mass block; optical cable joints are arranged on two sides of the base; an optical fiber penetrates through the two optical cable joints and is fixed on the supporting block I and the supporting block II; and an optical grating area is formed between the supporting block I and the supporting block II. The high-sensitivity FBG acceleration sensor provided by the invention has the advantages as follows: as two ends of the optical grating area are fixed between the cantilever beam and the supporting blocks, the sensitivity of the sensor is enhanced, chirp or multimodal phenomenon is avoided, a mechanical model of design calculation is deduced, and overload safety protection design, optical grating prestretching design and so on are carried out on the sensor; and through finite element analysis computation, strain distribution situation and 6-order fixed frequency of the cantilever beam are obtained, and it is proved that an analysis result is consistent with design computation.

Description

Technical field [0001] The invention relates to a fiber grating sensor, in particular to a high-sensitivity FBG acceleration sensor. Background technique [0002] Fiber grating sensor is a kind of fiber sensor. The sensing process based on fiber grating obtains sensing information by modulating the fiber Bragg wavelength by external physical parameters. It is a wavelength modulation type fiber sensor. The existing fiber grating acceleration sensor is prone to chirp or multi-peak phenomenon when in use, and its sensitivity is a problem. And when the external impact is too large, the excessive acceleration will cause the grating to produce a large axial strain and cause the grating to be broken. Summary of the invention [0003] The present invention solves the above-mentioned shortcomings of the prior art and provides a durable high-sensitivity FBG acceleration sensor. [0004] The technical solution adopted by the present invention to solve its technical problems: this high-sensit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/03
Inventor 贾淑红王晓宇刘兵王侃
Owner ZHEJIANG COLLEGE OF CONSTR
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