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Sensitization platform fiber bragg grating vibration sensor

A technology of vibration sensor and optical fiber grating, which is applied to instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves. It can solve the problems of sensor head processing, installation difficulties, and low sensor sensitivity, so as to improve sensitivity and shorten the force range. Effect

Active Publication Date: 2015-01-21
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of sensor head is difficult to process and install
At the same time, the grating used is an ordinary Bragg grating, and it must be pasted on the microbeam, so the sensitivity of the sensor is not high

Method used

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  • Sensitization platform fiber bragg grating vibration sensor
  • Sensitization platform fiber bragg grating vibration sensor
  • Sensitization platform fiber bragg grating vibration sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] exist Figure 1 ~ Figure 2 Among them, the fiber grating vibration sensor of the sensitization platform of this embodiment consists of an upper cover 1, an upper sensing grating 2, a cantilever beam 3, a lower sensing grating 4, a mass 5, an upper sensitization platform 6, a lower sensitization platform 7, a lower The cover 8, the lower optical fiber tube 9, the upper optical fiber tube 10, and the optical fiber 11 are connected to form.

[0018] The geometric shape of the upper sensitization platform 6 in this embodiment is a ring structure, and the upper sensitization platform 6 is connected as a whole with an upper sensing grating fixing ring 6-1, and the upper sensing grating fixing ring 6-1 is a ring structure. The upper left side of the upper sensitivity enhancement platform 6 above the upper sensing grating fixing ring 6-1 is provided with an upper optical fiber tube 10 through threaded connection, and the lower end of the upper sensitivity enhancement platform 6...

Embodiment 2

[0024] In this embodiment, the distance between the left end of the proof mass 5 and the inner edge of the upper sensing grating fixing ring 6-1 is 5mm. The upper part of an optical fiber 11 is pasted on the upper surface of the upper sensing grating fixing ring 6-1 and the upper surface of the quality block 5 with a model 353 epoxy glue, and the lower part is pasted on the lower part with a model 353 epoxy glue. The lower surface of the grating fixing ring 7-1 and the lower surface of the quality block 5, the upper part of the optical fiber 11 is written with the upper sensing grating 2, and the lower part is written with the lower sensing grating 4, the wavelength of the upper sensing grating 2 is 1500nm, the upper grating The area length is 2mm, the wavelength of the lower sensing grating 4 is 1500nm, and the length of the lower grid area is 2mm. 3 times the distance between the surface and the lower surface of the lower sensing grating fixing ring 7-1. Other components an...

Embodiment 3

[0026] In this embodiment, the distance between the left end of the proof mass 5 and the inner edge of the upper sensing grating fixing ring 6-1 is 10 mm. The upper part of an optical fiber 11 is pasted on the upper surface of the upper sensing grating fixing ring 6-1 and the upper surface of the quality block 5 with a model 353 epoxy glue, and the lower part is pasted on the lower part with a model 353 epoxy glue. The lower surface of the grating fixing ring 7-1 and the lower surface of the quality block 5, the upper part of the optical fiber 11 is written with the upper sensing grating 2, and the lower part is written with the lower sensing grating 4, the wavelength of the upper sensing grating 2 is 1600nm, and the upper grating The area length is 4mm, the wavelength of the lower sensing grating 4 is 1600nm, the length of the lower grid area is 4mm, and the length of the optical fiber 11 between the upper sensing grating 2 and the lower sensing grating 4 is the upper sensing ...

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Abstract

The invention relates to a sensitization platform fiber bragg grating vibration sensor. An upper sensitization platform is provided with an upper sensing grating fixing ring, the left side of the upper sensitization platform is provided with an upper optical fiber tube, the lower end of the upper sensitization platform is provided with a lower sensitization platform, the lower sensitization platform is provided with a lower sensing grating fixing ring, the lower sensitization platform is provided with a lower optical fiber tube, the upper sensitization platform and the lower sensitization platform are provided with a cantilever beam therebetween, a free end of the cantilever beam is provided with a mass block, the upper end of the upper sensitization platform is provided with an upper cover, the lower end of the lower sensitization platform is provided with a lower cover, the upper part of a light-guide fiber is arranged at the upper surface of the upper sensing grating fixing ring and the upper surface of the mass block, the lower part of the light-guide fiber is arranged at the lower surfaced of the lower sensing grating fixing ring and the lower surface of the mass block, the upper part of the light-guide fiber is written with an upper sensing grating with the wavelength being 1500-1600nm, the lower part of the light-guide fiber is written with a lower sensing grating with the wave length being 1500-1600nm, the length of an upper grating area is 2-4mm, the length of a lower grating area is 2-4mm, the upper end of the light-guide fiber penetrates out from the upper optical fiber tube, and the lower end of the light-guide fiber penetrates out from the lower optical fiber tube.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensors, in particular to an optical fiber grating sensor used for detecting vibration frequency. technical background [0002] Conventional electromagnetic vibration sensors output weak current analog signals. Since the signals are susceptible to electromagnetic interference, they cannot work normally in a strong electromagnetic field environment such as large electromechanical equipment, nor can they be transmitted over long distances. A better solution at present is to convert the weak analog signal into a digital signal through an A / D conversion circuit nearby, but this will increase the cost of the sensor and is inconvenient to use. Fiber Bragg grating vibration sensor is a wavelength modulation sensor. Compared with conventional electromagnetic or mechanical sensors, it has some advantages of traditional optical fiber sensors, such as high sensitivity, wide dynamic range, no el...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 乔学光高宏贾振安傅海威刘钦朋邵敏
Owner XI'AN PETROLEUM UNIVERSITY
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