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Sensitivity-enhanced type fiber bragg grating strain sensor based on micrometric displacement amplifying mechanism

A technology of strain sensor and amplifying mechanism, applied in instruments, optical devices, measuring devices, etc., can solve the problems of poor sensitivity improvement ability of strain sensors, insignificant improvement of sensor sensitivity, and large volume of fiber grating strain sensors, and achieves the increase of strain sensors. Significant sensitization effect, better sensitization effect, obvious effect with small volume

Active Publication Date: 2019-03-12
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, many fiber grating strain sensors use sensitizing materials to improve sensitivity, but the maximum sensitization multiple is about 5 times. This method has poor sensitivity improvement ability for strain sensors and requires high sensitizing materials.
[0003] In order to improve the sensitivity, a substrate-type FBG strain sensor sensitization structure has appeared in the prior art, but the volume of the FBG strain sensor with this sensitization structure is too large
In the prior art, there is also a fiber grating strain sensor packaged in a titanium alloy substrate, but the sensitivity improvement effect of the sensor with this sensitization structure is not significant

Method used

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  • Sensitivity-enhanced type fiber bragg grating strain sensor based on micrometric displacement amplifying mechanism
  • Sensitivity-enhanced type fiber bragg grating strain sensor based on micrometric displacement amplifying mechanism
  • Sensitivity-enhanced type fiber bragg grating strain sensor based on micrometric displacement amplifying mechanism

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Embodiment Construction

[0030] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a sensitivity-enhanced type fiber bragg grating strain sensor based on a micrometric displacement amplifying mechanism, and belongs to a fiber bragg grating sensor technology.The problems that an ordinary fiber bragg grating strain sensor is not high in sensitivity and the micro-strain of the structure cannot be accurately measured are solved. The sensitivity-enhanced typefiber bragg grating strain sensor comprises an upper layer protection shell, a sensitivity-enhanced amplifying mechanism, a bottom layer protection shell and a fiber bragg grating. Two connecting bosses of the sensitivity-enhanced amplifying mechanism can be connected with a measured object through rectangular holes in the bottom layer protection shell. The sensitivity-enhanced amplifying mechanism is further provided with a first-stage level and a second-stage level. The micrometric displacement generated by the measured object is subjected to two-stage amplifying and transmitted to the fiber bragg grating in a bragg grating installation groove. The sensor is remarkable in sensitivity enhancing effect, wide in use range and suitable for measuring the micro-strain of the structure.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensors, and relates to an enhanced-sensitivity optical fiber grating strain sensor, in particular to an enhanced-sensitivity optical fiber grating strain sensor based on a micro-displacement amplification mechanism. Background technique [0002] For the measurement of some micro-strains, the strain sensors used need to achieve high enough sensitivity, and ordinary fiber grating strain measurement sensors do not have sufficient sensitivity, so they are no longer suitable for micro-strain measurements of structures. At present, many fiber Bragg grating strain sensors use sensitizing materials to improve sensitivity, but the maximum sensitizing factor is about 5 times. This method has poor sensitivity improvement ability for strain sensors and requires high sensitizing materials. [0003] In order to improve the sensitivity, a substrate-type optical fiber grating strain sensor sensitiv...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 贾书海彭俊周星金一鸣陈继忠
Owner XI AN JIAOTONG UNIV
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