Refractive index sensor based on photonic crystal fiber

A photonic crystal fiber and refractive index sensor technology, which is applied in the measurement of phase influence characteristics, etc., can solve the problems of less involvement in the field of high refractive index liquid measurement, limit the application range of optical fiber sensors, etc., and achieve simple measurement methods, cost reduction, and sensitivity improvement. Effect

Inactive Publication Date: 2013-11-06
CHINA JILIANG UNIV
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Problems solved by technology

[0005] In the above research, the existing sensing technology is less involved in the measurement of high refractive index liquids, which limits the application range of fiber optic sensors

Method used

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  • Refractive index sensor based on photonic crystal fiber
  • Refractive index sensor based on photonic crystal fiber
  • Refractive index sensor based on photonic crystal fiber

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] figure 1 The structure of the photonic crystal fiber in the present invention is shown, including a core 1 , an air hole layer 2 and a cladding 3 . The inside of the core 1 is hollow, the refractive index of the core 1 is 1, and the diameter is 10 μm. The air hole layer 2 is located in the cladding layer. There are three air hole layers in this embodiment. Each air hole layer 2 is composed of a plurality of air holes, and the air hole layer 2 is a regular hexagon with the core as the center. Each air hole has a refractive index of 1 and a diameter of 10 μm, and the distance between adjacent air holes is the same as the diameter of the air holes. The cladding layer 3 is made of silicon dioxide with a refractive index of 1.45. The minimum center distance d between the fiber core and the air holes in the innermost air hole layer is 17.32 μm, and the maximum cent...

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Abstract

The invention relates to a refractive index sensor based on a photonic crystal fiber. One technical scheme of the invention comprises a light source, a single-mode fiber, the photonic crystal fiber and an image sensor. The other technical scheme of the invention comprises a broadband light source, the single-mode fiber, the photonic crystal fiber, a first 3dB fiber coupler, a second 3dB fiber coupler and a spectroscope. The photonic crystal fiber comprises a fiber core, at least one air hole layer and a wrapping layer; the interior of the fiber core is hollow; the at least one air hole layer is positioned in the wrapping layer; each air hole layer encircles the center of the fiber core; and the wrapping layer is made of silicon dioxide. By using a photonic crystal fiber refractive index sensing device with high sensing precision, the sensitivity of measurement for liquid with different refractive indexes is high; and the refractive index sensor can be particularly applied to micro measurement for liquid with high refractive index.

Description

technical field [0001] The invention belongs to the technical field of photonic crystal fiber sensing and relates to a refractive index sensor based on photonic crystal fiber. Background technique [0002] In recent years, with the advancement of science and technology, people have higher and higher requirements for sensors. Optical fiber sensors have always played an important role in scientific research and industrial applications due to their own advantages. [0003] In traditional fiber optic sensor applications, including long-period fiber grating sensors and fiber Bragg grating sensors, etc., due to their sensitivity to ambient temperature, the cross-effect on physical quantities such as refractive index is more serious, which will lead to poor sensing accuracy. ideal. At the same time, traditional optical fiber sensors can only be used to measure liquids with a lower refractive index than the cladding, and will fail in the measurement of high refractive index liq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41
Inventor 赵春柳章辰王治强裘燕青金永兴
Owner CHINA JILIANG UNIV
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