Temperature self-compensation FBG (Fiber Bragg Grating) refractive index sensor based on conical corrosion

A refractive index sensor and self-compensation technology, which is applied in the measurement of phase influence characteristics, cladding optical fiber, optical waveguide and light guide, etc., can solve problems such as cross sensitivity, achieve compact structure, reduce sensor cost, and solve the cross between temperature and refractive index The effect of sensitive issues

Inactive Publication Date: 2012-11-14
CHINA JILIANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of cross-sensitivity existing in the existing refractive index measurement sensing technology, and to provide a compact temperature self-compensating FBG refractive index sensor based on conical corrosion, which can effectively solve the problems in the measurement process. The cross-sensitivity problem between physical parameters greatly reduces the complexity of the sensor, and has strong anti-interference ability for various unstable factors such as fiber jitter and fiber bending

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  • Temperature self-compensation FBG (Fiber Bragg Grating) refractive index sensor based on conical corrosion

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] Such as figure 1 As shown, the temperature self-compensating FBG refractive index sensor based on tapered erosion includes a broadband light source 1, a 3dB coupler 2, a tapered etched fiber Bragg grating 3, and a spectrometer 4. One end of the broadband light source 1 is optically connected to the first port of the 3dB coupler 2, the second port of the 3dB coupler 2 is optically connected to one end of the tapered-corroded fiber Bragg grating 3, and the third port of the 3dB coupler 2 is connected to the Spectrometer 4 optical connections.

[0014] The working mode of this embodiment is: the light emitted by the broadband light source enters the tapered corroded fiber Bragg grating through the 3dB coupler, and the reflected light from the tapered corroded fiber Bragg grating is transmitted into the spectrometer through the 3dB coupler. Since the cladding of t...

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Abstract

The invention relates to a temperature self-compensation FBG (Fiber Bragg Grating) refractive index sensor based on conical corrosion. In the invention, a broadband light source is directly connected with a first port of a 3dB coupler through light, a second port of the 3dB coupler is connected with a conical-corrosion FBG, and a third port of the 3dB coupler is connected to a spectrograph. The invention has the advantages that the problem of cross sensitivity among physical parameters in a refractive-index measurement sensing technology can be effectively solved to realize sensing measurement of the refractive index by means of temperature self-compensation, and the sensor has a compact structure, further improved measurement precision and stronger antijamming capability to optical fibervibration and the like. Meanwhile, an additional FBG does not need to be cascaded, so that the cost of the sensor is greatly reduced and the sensing measurement for multipoint distribution is easy.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to a refractive index sensor that realizes temperature self-compensation based on a tapered-corroded fiber Bragg grating (fiber Bragg grating, FBG). Background technique [0002] At present, the refractive index sensing technology has important research significance in the fields of environmental monitoring, medical diagnosis, petrochemical and other biochemical applications. Optical fiber-based refractive index sensors are gradually replacing traditional refractive index sensors due to their advantages of small size, no electromagnetic interference, high sensitivity, light weight, suitable for detection in flammable, explosive and other harsh environments, and remote sensing. , Widely used in various fields of production and life. [0003] Fiber Bragg Grating is one of the most rapidly developed fiber optic passive devices in recent years. It has the advantages of gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G02B6/02
Inventor 赵春柳姬崇轲周文俊董新永倪凯张在宣金尚忠
Owner CHINA JILIANG UNIV
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