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Three-dimensional FBG (fiber bragg grating) acceleration sensor based on flexure hinges

A three-dimensional acceleration, flexible hinge technology, applied in multi-dimensional acceleration measurement, acceleration measurement using inertial force, etc., can solve the problems of fiber grating easy to produce chirp, low sensitivity, etc., to achieve long-term reliability, high sensitivity, simple structure Effect

Inactive Publication Date: 2015-12-02
山东山科安测光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design measures the acceleration through the wavelength change of four fiber gratings distributed at 90° in the circumferential direction of the steel pipe surface. Paste directly on the steel pipe, when the force is uneven, the fiber grating is prone to chirp

Method used

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  • Three-dimensional FBG (fiber bragg grating) acceleration sensor based on flexure hinges
  • Three-dimensional FBG (fiber bragg grating) acceleration sensor based on flexure hinges
  • Three-dimensional FBG (fiber bragg grating) acceleration sensor based on flexure hinges

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Experimental program
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Embodiment 1

[0034] exist figure 1 Among them, the fiber Bragg grating three-dimensional acceleration sensor based on the flexible hinge of this embodiment consists of a housing 1, an L-shaped base 2, a flexible hinge 3 in the X direction, a fiber grating in the X direction 4, a flexible hinge in the Y direction 5, a fiber Bragg grating in the Y direction 6, Z-direction flexible hinge 7, Z-direction fiber grating.

[0035] The housing 1 of this embodiment is a hollow cubic shape, and the L-shaped base 2 is integrated with the housing 1 and is made of 304 stainless steel. The X-direction flexible hinge 3 and the Z-direction flexible hinge 7 are fixed on the long arm of the L-shaped base 2 by screws, and the Y-direction flexible hinge 5 is fixed on the short arm of the L-shaped base 2 .

[0036] The X-direction flexible hinge 3 , the Y-direction flexible hinge 5 and the Z-direction flexible hinge 7 are all single-axis flexible hinges. One end of each uniaxial flexible hinge is a fixed end,...

Embodiment 2

[0053] In this embodiment, the height of the rectangular cutout of the upper groove 10 of the flexible hinge is 7 mm, the height of the rectangular cutout of the lower groove 12 is 3 mm, the thickness t of the thin wall is 1 mm, and the thickness h of the thick wall is 17 mm. Other dimensions of the flexible hinge are the same as Example 1 is the same. The other components and the connection relationship of the components are the same as in Embodiment 1. Experimental results show that the resonance frequency of the sensor is 790Hz, and the wavelength sensitivity is 24pm / g.

Embodiment 3

[0055] In this embodiment, the thickness t of the thin wall of the flexible hinge is 0.3 mm, the thickness h of the thick wall is 16.3 mm, and other dimensions of the flexible hinge are the same as those in Embodiment 1. The other components and the connection relationship of the components are the same as in Embodiment 1. Experimental results show that the resonance frequency of the sensor is 290Hz, and the wavelength sensitivity is 162pm / g.

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Abstract

The invention discloses a three-dimensional FBG (fiber bragg grating) acceleration sensor based on flexure hinges. The three-dimensional FBG acceleration sensor comprises a casing, wherein an L-shaped base and three single-axis flexure hinges are arranged in the casing, two single-axis flexure hinges are fixed on a long arm of the L-shaped base, the other single-axis flexure hinge is fixed on a short arm of the L-shaped base, and sensitive axes of the three single-axis flexure hinges are perpendicular to one another; one end of each single-axis flexure hinge is a fixed end and fixed on the L-shaped base, and the other end is a free end; an optical fiber groove is formed in the upper surface, perpendicular to the direction of the sensitive axis, of each single-axis flexure hinge, and an optical fiber is fixed in the optical fiber groove; grooves are formed in the upper surface and the lower surface between the fixed end and the free end of each single-axis flexure hinge, and FBGs are arranged in the grooves; each groove of each single-axis flexure hinge comprises two symmetrical rectangular notches and a semielliptical notch connected with the rectangular notches. The three-dimensional FBG acceleration sensor based on the flexure hinges has high sensitivity and realizes measurement of acceleration in three directions.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a three-dimensional optical fiber grating acceleration sensor based on a flexible hinge. Background technique [0002] The basic sensing principle of the fiber grating acceleration sensor is to use the force of the elastic element to convert the acceleration into the strain of the fiber Bragg grating, which is converted into the change of the Bragg wavelength, and the measurement of the acceleration amplitude is realized by detecting the change of the wavelength. The fiber grating acceleration sensor is intrinsically safe and has strong anti-electromagnetic interference ability, so it has unique advantages in special environments such as flammable, explosive, and strong electromagnetic. [0003] At present, most fiber grating acceleration sensors can only detect single-component acceleration values, but in practice, it is necessary to obtain acceleration...

Claims

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Application Information

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IPC IPC(8): G01P15/03G01P15/18
Inventor 王金玉胡宾鑫宋广东刘统玉
Owner 山东山科安测光电科技有限公司
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