Rotary machine temperature measuring method and rotary machine temperature measuring device based on fiber gratings

A technology of fiber grating and rotating machinery, applied in the field of temperature measurement of rotating machinery, to achieve the effect of solving the problem of cross sensitivity

Active Publication Date: 2017-01-11
WUHAN UNIV OF TECH
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Problems solved by technology

Many experiments in the prior art cannot solve the cross-sensitivity problem well

Method used

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  • Rotary machine temperature measuring method and rotary machine temperature measuring device based on fiber gratings
  • Rotary machine temperature measuring method and rotary machine temperature measuring device based on fiber gratings
  • Rotary machine temperature measuring method and rotary machine temperature measuring device based on fiber gratings

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0041] Experimental principle

[0042] Fiber Bragg grating sensor is a new type of fiber optic sensor made by utilizing the sensitivity of Bragg wavelength to temperature and strain. According to the fiber-coupled mode theory, when broadband light is transmitted in a fiber grating, mode coupling will occur, and the light satisfying the Bragg condition will be reflected. The central reflection wavelength of the fiber Bragg grating (FBG) is:

[0043] lambda B =2n eff ·Λ (1)

[0044] In the formula, n eff is the effective refractive index of the guided mode, and Λ is the grating period.

[0045]...

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Abstract

The invention provides a rotary machine temperature measuring method and a rotary machine temperature measuring device based on fiber gratings, wherein the temperature measuring method comprises the following steps of binding the fiber gratings with different central wavelengths with one side of a large wheel, binding the fiber gratings with same central wavelengths at symmetrical positions at the other side of the large wheel and successively marking; connecting the fiber gratings with a demodulating instrument through a rotatable connector; connecting the rotating speed of a large-wheel variable-frequency motor, generating heat at a contact point between the large wheel and a small wheel through friction along with rotation of the large wheel, and transmitting the heat to the fiber gratings; performing transmission from a light source which is arranged in the demodulating instrument to the fiber gratings through the rotatable connector, realizing wavelength change of the fiber gratings along with temperature change, and generating a temperature signal; performing demodulation on the temperature signal of the fiber gratings and transmitting a demodulated signal to an industrial control computer by the demodulating instrument; receiving the demodulated signal by the industrial control computer and performing acquisition and analysis, and furthermore a wavelength-time change chart of each fiber grating according to an acquisition and analysis result.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a temperature measurement method and device for rotating machinery based on fiber grating sensing technology Background technique [0002] When the temperature and strain around the grating change, it will affect the period of the grating or the change of the refractive index of the fiber core, so that the central wavelength of the fiber grating will change. In the actual test, the variation of the fiber Bragg grating reflection wavelength is affected by temperature and stress at the same time, and this effect is not independent of each other but interacts, which brings certain difficulties to the measurement in the actual test. When temperature and stress change at the same time, it is difficult for general demodulation software to distinguish the respective changes of temperature and stress. This situation is called "cross-sensitivity". Many experiments in the prior art ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01L1/24G01K11/3206
CPCG01K11/3206G01L1/246
Inventor 刘晓刚谭跃刚
Owner WUHAN UNIV OF TECH
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