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Fiber Bragg Grating Vibration Sensor for Sensitization Platform

A technology of vibration sensor and optical fiber grating, which is applied to instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc. 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: 2018-02-23
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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  • Fiber Bragg Grating Vibration Sensor for Sensitization Platform
  • Fiber Bragg Grating Vibration Sensor for Sensitization Platform
  • Fiber Bragg Grating Vibration Sensor for Sensitization Platform

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

A fiber grating vibration sensor for a sensitivity-increasing platform. An upper sensing grating fixing ring is arranged on the upper sensitivity-increasing platform. An upper optical fiber tube is arranged on the left side of the upper sensitivity-increasing platform. The lower sensing grating fixed ring is set on the platform, the lower optical fiber tube is set on the lower sensitization platform, the cantilever beam is set between the upper sensitization platform and the lower sensitization platform, the free end of the cantilever beam is set with a quality block, and the upper end of the upper sensitization platform is set. The upper cover, the lower end of the lower sensitization platform is provided with a lower cover, the upper part of an optical fiber is arranged on the upper surface of the upper sensing grating fixing ring and the upper surface of the quality block, and the lower part is arranged on the lower surface of the lower sensing grating fixing ring and the lower surface of the quality block, The upper part of an optical fiber is written with an upper sensing grating with a wavelength of 1500-1600nm, and the lower part is written with a lower sensing grating with a wavelength of 1500-1600nm. The length of the upper grid area is 2-4mm, and the length of the lower grid area is 2-4mm. The upper end of the fiber passes through the upper optical fiber tube, and the lower end of the fiber passes through 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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Patent Type & Authority Patents(China)
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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