Two-dimensional displacement sensor based on three-core single-mode fiber Bragg grating
A displacement sensor, fiber grating technology, applied in instruments, optical devices, measuring devices, etc., can solve problems such as unfavorable sensor miniaturization, and achieve the effect of light weight and small volume
Inactive Publication Date: 2013-03-27
CHINA JILIANG UNIV
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But its disadvantages are obvious: firstly, it needs to apply a large force (such as bending the elastic beam) to convert the measured displacement into the wavelength change of the fiber grating, which may affect the displacement change of the measured object; secondly, to realize two-dimensional Displacement measurement requires two orthogonally placed sensors, which is not conducive to the miniaturization of the sensor; in addition, since the wavelength of the fiber grating will also change due to temperature changes, it is usually necessary to attach a fiber grating temperature sensor for temperature compensation
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[0014] The present invention will be further described below in conjunction with the accompanying drawings.
[0015] Such as figure 1 As shown, a two-dimensional displacement sensor based on a three-core single-mode fiber grating includes a light source, a common single-mode fiber, a three-core single-mode fiber grating, a wavelength measurement and a data processing module. The coupling area is a tapered coupling area where the common single-mode fiber and the three-core single-mode fiber grating are fused by the method of patent No. 200610151033.1. There is a grating on each core of the three-core single-mode fiber, and the three fiber gratings have different reflection wavelengths.
[0016] Its working mode: the light from the wide-spectrum light source is input into the three-core single-mode fiber through the common single-mode fiber, and the light reflected by the grating is also output through the common single-mode fiber, and then reaches the wavelength measurement mo...
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The invention relates to a two-dimensional displacement sensor based on a three-core single-mode fiber Bragg grating. Three cores of three-core single-mode fiber are distributed in the form of an equilateral triangle by centering on the center of the fiber. A fiber Bragg grating is written on each core at the sensing part of the fiber. The three fiber Bragg gratings are different in reflection wavelength. One end of the three-core single-mode fiber Bragg grating is fixed, and two-dimensional displacement, the same as that of the measured object, or in proportional increase or decrease, occurs to the other end of the three-core single-mode fiber Bragg grating. Bending of the three-core single-mode fiber is caused by the displacement change, the reflection wavelength of the three fiber Bragg gratings changes differently due to the bending in different directions. Two-dimensional displacement measurement can be achieved through wavelength measurement and a data processing module. The two-dimensional displacement sensor in full-fiber design has the advantages of small size, light weight, electromagnetic radiation resistance, and capability of operating in severe environments, such as high temperature and high pressure, and the like.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a two-dimensional displacement sensor based on a three-core single-mode optical fiber grating. Background technique [0002] Existing FBG displacement sensors require complex displacement-strain conversion devices, such as elastic bending beams, to convert displacement to FBG strain. For example, if the grating is pasted on the surface of the cantilever beam, the displacement will bend the cantilever beam through the connector, so that the fiber grating will be stretched or squeezed, and the reflected wavelength will change accordingly, and the corresponding relationship between displacement and wavelength change will be obtained. , so that the displacement change information can be obtained through the change of the fiber grating wavelength. But its disadvantages are obvious: firstly, it needs to apply a large force (such as bending the elastic beam) t...
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IPC IPC(8): G01B11/02
Inventor 董新永綦菲
Owner CHINA JILIANG UNIV