A Capillary Optical Fiber Refractive Index Sensor

A technology of optical fiber refractive index and capillary tube, which is applied in the field of liquid temperature and refractive index measurement, can solve the problems of insensitivity of environmental refractive index and cannot be used to make biochemical sensors or biological probes, and achieve the expansion of liquid measurement types, improvement of precision, To achieve the effect of temperature compensation

Inactive Publication Date: 2011-12-07
HARBIN ENG UNIV
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Problems solved by technology

However, traditional FBG is not sensitive to the refractive index of the env

Method used

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  • A Capillary Optical Fiber Refractive Index Sensor
  • A Capillary Optical Fiber Refractive Index Sensor
  • A Capillary Optical Fiber Refractive Index Sensor

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Experimental program
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Embodiment

[0024] Such as figure 1 as shown, figure 1 It is a schematic diagram of the structure of the capillary fiber without inner cladding in the refractive index sensor of the capillary fiber of the present invention. The capillary fiber includes a thin waveguide layer 1 on which the fiber Bragg grating is written; an air hole core 2 into which samples with different refractive indices can enter through capillary phenomena; and a cladding layer 3 on which the capillary Optical fiber is only suitable for testing samples whose refractive index is smaller than that of the waveguide layer, and has higher sensitivity.

[0025] Such as figure 2 as shown, figure 2It is a schematic structural diagram of the capillary optical fiber with inner cladding in the refractive index sensor of the capillary optical fiber of the present invention. The capillary fiber includes a thin waveguide layer 7 on which the fiber Bragg grating is written; the inner cladding layer 5 and the outer cladding l...

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Abstract

The invention belongs to the field of measurement of liquid temperature and refractive index, and specifically provides a capillary fiber refractive index sensor capable of measuring a liquid temperature and a liquid refractive index simultaneously. The invention provides a capillary fiber refractive index sensor. A light source is connected to an input fiber; the input fiber is connected with a sensing head portion, which connects to an output fiber; and the output fiber connects a wavelength demodulation instrument. The sensor is characterized in that the sensing head portion comprises a single-mode fiber written with a Bragg fiber grating connecting with a capillary fiber written with a Bragg fiber grating. The capillary fiber employs a single cladding capillary fiber or a double cladding capillary fiber. The input fiber and the output fiber are single-mode fibers. The incident light is a wide spectrum light source. The sensor of the invention has a simple and compact structure anda high sensitivity, and is convenient for measurement.

Description

technical field [0001] The invention belongs to the field of liquid temperature and refractive index measurement, in particular to a capillary optical fiber refractive index sensor capable of simultaneously measuring liquid temperature and refractive index. Background technique [0002] Refractive index is an important physical parameter of fluid medium. Many properties of fluid medium, such as liquid concentration, mixture composition, specific gravity and pH value, etc., can be reflected in its refractive index. Therefore, by measuring the refractive index of a liquid, one can understand its physical and chemical properties. Therefore, the measurement of the refractive index is an effective means to analyze and study various properties of liquids, and it is also an important method for the detection and control of various reaction processes in industrial production. There are many methods for measuring the refractive index, and the commonly used refractive index measurin...

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Application Information

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IPC IPC(8): G01N21/41G01K11/32G01K11/3206
Inventor 彭石军张安娜张建中苑立波孙伟民
Owner HARBIN ENG UNIV
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