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A dual-wavelength temperature measurement method based on long-period fiber gratings

A fiber grating and long-period technology, which is applied in the direction of physical/chemical change thermometers, thermometers, and heat measurement, can solve the problems of high cost, large measurement error, and high measurement cost, so as to eliminate fluctuation interference and reduce measurement cost , Improve the effect of measurement accuracy

Active Publication Date: 2022-04-08
YANGTZE NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the applicant thought of changing the existing temperature measurement method of wavelength modulation, and reflected the change of wavelength on the change of light intensity, and then designed a temperature measurement method based on light intensity change, so as to avoid the The problem of high cost of measurement
However, the measurement method of light intensity change has high requirements on the stability of the incident light source (laser light source is required, and its cost is also high), because the fluctuation of the intensity of the incident light source will bring large measurement errors, which in turn makes the temperature measurement The measurement accuracy is low

Method used

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  • A dual-wavelength temperature measurement method based on long-period fiber gratings
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  • A dual-wavelength temperature measurement method based on long-period fiber gratings

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Embodiment

[0035] During the actual research, the applicant made the following derivation based on the long-period fiber grating dual-wavelength temperature measurement method:

[0036] 1) According to the standard FBG coupling mode theory, the transmittance can be written as:

[0037]

[0038] In the formula, A represents the transmittance, k=vσ / 2 represents the AC coupling coefficient, v represents the visibility, σ represents the DC coupling coefficient, z represents the length of the H-LPFG, Indicates the DC self-coupling coefficient.

[0039] 2) Specifically:

[0040]

[0041]

[0042] In the formula, Indicates the grating chirp, δ indicates the amount of detuning, Δn eff Indicates the difference in refractive index between the fundamental mode and the m-th cladding mode.

[0043] 3) while σ 11 , σ 22 and σ 21 It can be calculated using overlapping integrals:

[0044]

[0045]

[0046]

[0047] where λ represents the wavelength, Indicates the spatially a...

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Abstract

The present invention relates to the technical field of optical fiber temperature measurement, in particular to a dual-wavelength temperature measurement method based on long-period fiber gratings, including: acquiring the original optical signal emitted by the long-period optical fiber grating; performing spectroscopic processing on the original optical signal to obtain the corresponding Two beams of measuring light signals; performing filter processing on the two beams of measuring light signals respectively to obtain corresponding two beams of filtered transmitted light, and then respectively collecting two transmitted light intensity values ​​corresponding to the two beams of filtered transmitted light; according to the two beams of filtered transmitted light A transmitted light intensity value, and the set calculation model to calculate the corresponding temperature value. Compared with the prior art, the dual-wavelength temperature measurement method based on long-period fiber Bragg gratings in the present invention does not use wavelength changes to measure temperature, but uses intensity values ​​to measure temperature, and can eliminate the interference of incident light source intensity fluctuations, and can reduce the measurement temperature. The cost of measuring temperature and improving the measurement accuracy of temperature measurement.

Description

technical field [0001] The invention relates to the technical field of optical fiber temperature measurement, in particular to a dual-wavelength temperature measurement method based on a long-period fiber grating. Background technique [0002] Fiber Bragg grating sensor is a kind of fiber optic sensor. The sensing process based on fiber Bragg grating is to obtain sensing information through the modulation of the wavelength and intensity of fiber Bragg grating by external physical parameters. According to the length of the fiber grating period, fiber gratings with a period of less than 1 μm are usually called short-period fiber gratings, also known as fiber Bragg gratings or reflection gratings; while fiber gratings with a period of tens to hundreds of microns are called long-period fibers. Grating, also known as transmission grating. Compared with ordinary fiber Bragg gratings (that is, short-period fiber gratings), long-period fiber gratings have higher temperature and str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/3206
CPCG01K11/3206
Inventor 白云峰党随虎夏钦峰李鹏徐凯何妮茜徐小晨
Owner YANGTZE NORMAL UNIVERSITY
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