Fiber grating acceleration transducer based on metal bellows structure

A technology of acceleration sensor and metal bellows, which is applied in the direction of acceleration measurement by using inertial force, can solve the problems of poor anti-lateral interference ability, inaccurate measurement results, inconsistent vibration direction, etc., and achieves easy series assembly and improved sensitivity. high effect

Inactive Publication Date: 2012-05-30
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of fiber grating acceleration sensor has complex structure, many parts, difficult to assemble, and poor ability to resist lateral interference, and it is easy to cause the vibration direction of the L-shaped lever to be inconsistent with the vibration direction of the actual object, that is, the L-shaped lever is prone to lateral vibration when vibrating in the vertical direction. make measurements imprecise

Method used

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  • Fiber grating acceleration transducer based on metal bellows structure
  • Fiber grating acceleration transducer based on metal bellows structure
  • Fiber grating acceleration transducer based on metal bellows structure

Examples

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Effect test

Embodiment 1

[0020] exist figure 1 Among them, a fiber grating acceleration sensor based on a metal bellows structure in this embodiment is connected by a metal bellows 1, a vibration sensing fiber grating 2, a mass 3, an end cover 4, a sealing cover 5, a sensor connector 6, and a housing 7 constitute.

[0021] The shell 7 of this embodiment is a cylindrical structure, and the upper end of the metal bellows 1 is bonded to the lower surface of the inner top of the shell 7 with 502 glue. The metal bellows 1 is a beryllium bronze metal bellows, and the inner diameter of the metal bellows 1 is 18mm. , The outer diameter is 24mm, the wave pitch is 5mm, the wave thickness is 0.12mm, and the wave number is 9. The lower end of the metal bellows 1 is pasted with 502 glue to fix the quality block 3. The 502 glue is a commodity sold in the market and produced by Taizhou Jiaojiang Tuopu Adhesive Factory. The center of the quality block 3 is processed with a through hole. The mass in this embodiment ...

Embodiment 2

[0024] In this embodiment, the upper end of the metal bellows 1 is bonded to the lower surface of the inner top of the housing 7 with 502 glue, and the lower end of the metal bellows 1 is fixed to the mass block 3 with 502 glue. The inner diameter of the metal bellows 1 is 18mm , the outer diameter is 24mm, the wave pitch is 5mm, the wave thickness is 0.14mm, the wave number is 10, the quality of the mass block 3 is 15g, and the distance between the upper surface of the end cover 4 and the lower surface of the mass block 3 is 10mm. A vibration sensing fiber grating 2 is installed in the metal bellows 1, and the upper part of the optical fiber of the vibration sensing fiber grating 2 is led out from the central through hole of the housing 7 and fixed on the central hole of the outer surface of the housing 7 with 502 glue. The lower part of the optical fiber of the fiber grating 2 passes through the central through hole of the mass block 3 and is pasted and fixed on the central t...

Embodiment 3

[0026] In this embodiment, the upper end of the metal bellows 1 is bonded to the lower surface of the inner top of the housing 7 with 502 glue, and the lower end of the metal bellows 1 is fixed to the mass block 3 with 502 glue. The inner diameter of the metal bellows 1 is 10 mm , the outer diameter is 15 mm, the wave pitch is 3 mm, the wave thickness is 0.1 mm, the wave number is 5, the mass of the mass block 3 is 7.5 g, and the distance between the upper surface of the end cover 4 and the lower surface of the mass block 3 is 1 mm. A vibration sensing fiber grating 2 is installed in the metal bellows 1, and the upper part of the optical fiber of the vibration sensing fiber grating 2 is led out from the central through hole of the housing 7 and fixed on the central hole of the outer surface of the housing 7 with 502 glue. The lower part of the optical fiber of the fiber grating 2 passes through the central through hole of the mass block 3 and is pasted and fixed on the central ...

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Abstract

The invention discloses a fiber grating acceleration transducer based on a metal bellows structure. The upper end of the metal bellows is arranged on the lower surface of the top in a shell provided with a through hole; the lower end of the metal bellows is provided with a mass block; the lower end of the shell is provided with an end cover which is provided with a through hole and connected witha sealing cover; the lower end of the sealing cover is provided with a transducer joint; a vibration sensing fiber grating is arranged in the metal bellows; the upper part of the fiber of the vibration sensing fiber grating is fixed on the shell; and the lower part of the fiber of the vibration sensing fiber grating passes through a central through hole of the mass block to be fixed on the mass block, and is led out of the through hole on the side wall of the sealing cover and fixed on the side wall of the sealing cover. Compared with the existing acceleration transducer, the fiber grating acceleration transducer disclosed by the invention has the advantages of simple structure, small volume, high sensitivity, wide spectral range and long and thin shape, is easy to assemble in series and the like, and can realize multipoint distribution and dynamic online real-time monitoring.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensors, in particular to an optical fiber grating acceleration sensor used for measuring object acceleration and vibration signals. Background technique [0002] The fiber grating sensor uses changes in external physical quantities such as stress, strain, temperature, etc. to cause changes in the effective refractive index of the optical fiber or the grating period, which leads to changes in the center wavelength of the grating reflection. The external physical quantity is obtained by detecting the change in the center wavelength of the grating reflection. The change. Compared with traditional electrical acceleration sensors, electrical acceleration sensors output weak electrical signals, which are susceptible to electromagnetic interference, and are not suitable for working in strong electromagnetic field environments such as large electromechanical equipment, and cannot be transmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P15/03
Inventor 乔学光张敬花傅海威冯忠耀高宏杨扬周锐
Owner NORTHWEST UNIV
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