A Parameter Design Method of Fiber Bragg Grating Vibration Sensor

A vibration sensor, fiber grating technology, applied in instruments, measuring devices, using wave/particle radiation, etc., can solve the problems of time-consuming and expensive, not necessarily satisfactory results, low sensor sensitivity, etc., to improve the amplitude-frequency characteristics, The effect of high vibration frequency and high sensitivity

Active Publication Date: 2020-12-01
T&S COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing equipment in harsh environments such as strong electromagnetic fields and oil immersion (such as oil-immersed transformers / reactors, etc.), the traditional vibration measurement technology based on electrical sensing technology cannot meet or adapt to vibration measurement
[0003] At present, the fiber Bragg grating (hereinafter referred to as "fiber grating") vibration sensor is mostly based on the cantilever beam structure design technology, the fiber grating is prone to chirp phenomenon, and the sensor sensitivity is low, and the measurement frequency is usually 100Hz-200Hz
Someone has also developed a fiber grating vibration sensor based on L beams, but the free vibration attenuation is slow when the sensor is working, which affects the working performance of the sensor
[0004] In order to improve the working performance of the fiber grating vibration sensor, it is necessary to continuously adjust various parameters, and to carry out experiments and adjustments continuously. This process is very time-consuming and costly, and the final results are not necessarily satisfactory.

Method used

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  • A Parameter Design Method of Fiber Bragg Grating Vibration Sensor
  • A Parameter Design Method of Fiber Bragg Grating Vibration Sensor
  • A Parameter Design Method of Fiber Bragg Grating Vibration Sensor

Examples

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Embodiment 1

[0027] A parameter design method of a fiber grating vibration sensor, the fiber grating vibration sensor includes a substrate, an optical fiber, and a vibrator, grooves are provided on both sides of the substrate; the optical fiber includes an optical fiber and a bare fiber engraved with a grating; the The groove is on a straight line with the center of the vibrator; the optical fiber passes through the center of the vibrator and is tightly fixed in the grooves on both sides of the base; the vibrator is fixedly connected to the base through a damping sheet, Vibrate the fiber in the axial direction, such as figure 1 shown, including the following steps:

[0028] S1, setting the natural frequency f of the fiber grating vibration sensor n = 1500Hz;

[0029] S2. Select the type of optical fiber as G652 single-mode optical fiber, and obtain the Young's modulus of the optical fiber E=7.0·10 10 N / m 2 And fiber cross-sectional area S=1.23×10 -8 m 2 ;

[0030] S3. Adjust the num...

Embodiment 2

[0121] Embodiment 1 is to set other parameters by setting the natural frequency of the fiber grating vibration sensor, so as to produce the required sensor. This embodiment is to set the sensitivity of the fiber grating vibration sensor to set other parameters, thereby preparing required sensors.

[0122] Specifically, a parameter design method of a fiber grating vibration sensor, the fiber grating vibration sensor includes a substrate, an optical fiber, and a vibrator, grooves are provided on both sides of the substrate; the optical fiber includes an optical fiber engraved with a grating and a bare fiber ; the groove and the center of the vibrator are on a straight line; the optical fiber passes through the center of the vibrator and is tightly fixed in the grooves on both sides of the base; the vibrator and the base pass through a damping sheet The connection is fixed so that the optical fiber vibrates in the axial direction, comprising the following steps:

[0123] A1. Set...

Embodiment 3

[0136] According to the parameter design method of the fiber grating vibration sensor described in embodiment 1, as figure 2 As shown, a corresponding fiber grating sensor has been made, including a base body 7, an optical fiber 2, and a mass block 5, grooves 6 are provided on both sides of the base body 7, and the optical fiber includes an optical fiber and a bare fiber engraved with a grating; The groove 6 is on a straight line with the center 1 of the mass block 5, and the optical fiber 2 passes through the center 1 of the mass block 5 and is tightly fixed in the grooves on both sides of the base body 7. The mass block 5 is fixedly connected with the base 7 through the damping plate 4, so that the optical fiber 2 vibrates in the axial direction; it also includes a protective sleeve 8 and a spiral protective tube 9, and the optical fiber passing through the groove on one side of the base 7 passes through Through the protective sleeve 8 , the spiral protective tube 9 covers ...

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Abstract

The invention discloses a parameter design method of a fiber grating vibration sensor. The method comprises the following steps: S1) setting natural frequency or sensitivity of the fiber grating vibration sensor; S2) selecting the type of an optical fiber, and obtaining Young's modulus of the optical fiber and cross-sectional area of the optical fiber; S3) obtaining an equivalent elastic coefficient of the fiber by adjusting the number and effective length of the fibers at the two sides of a base body; S4) according to the equivalent elastic coefficient of the fiber and combined with the natural frequency in the step S1), obtaining oscillator quality, or according to the effective length of the optical fiber engraved with a grating at one side of the base body in the S3) and combined withthe sensitivity obtained in the S1), obtaining the oscillator quality; and S5) according to the oscillator quality and other given or obtained parameter values, preparing the sensor, so that the sensor having the natural frequency or sensitivity is obtained. Through fiber grating strain sensitive characteristics, the fiber is regarded as a spring, and a brand new parameter design method of the fiber grating vibration sensor for measuring vibration is provided.

Description

technical field [0001] The invention relates to a parameter design method of a fiber grating vibration sensor. Background technique [0002] For existing equipment in harsh environments such as strong electromagnetic fields and oil immersion (such as oil-immersed transformers / reactors, etc.), the traditional vibration measurement technology based on electrical sensing technology cannot meet or adapt to vibration measurement. [0003] At present, the fiber Bragg grating (hereinafter referred to as "fiber grating") vibration sensor is mostly based on the cantilever beam structure design technology, the fiber grating is prone to chirp phenomenon, and the sensor sensitivity is low, and the measurement frequency is usually 100Hz-200Hz. Someone has also developed a fiber grating vibration sensor based on L beams, but the free vibration attenuation is slow when the sensor is working, which affects the working performance of the sensor. [0004] In order to improve the working perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 侯丹卫广远
Owner T&S COMM
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