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A microhole single-mode glass fiber optic liquid refractive index sensor in cone area

A technology of liquid refractive index and glass optical fiber, which is applied in the direction of phase influence characteristic measurement, etc., can solve the problems of easy breakage of optical fiber and limitation of practical liquid refractive index measurement sensitivity of tapered optical fiber sensor, so as to improve measurement sensitivity, enhance mechanical strength, The effect of high measurement sensitivity

Inactive Publication Date: 2016-02-03
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to obtain higher measurement accuracy, the tapered optical fiber needs to be drawn into thin and long filaments, but too thin and long optical fiber is easily broken, which limits the practicality of the tapered optical fiber sensor and the measurement sensitivity of the liquid refractive index. Further improve

Method used

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  • A microhole single-mode glass fiber optic liquid refractive index sensor in cone area
  • A microhole single-mode glass fiber optic liquid refractive index sensor in cone area
  • A microhole single-mode glass fiber optic liquid refractive index sensor in cone area

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Embodiment 1

[0030] refer to figure 1 , the structure of the present invention's tapered microhole single-mode glass fiber optic liquid refractive index sensor includes a light source module 1, a tapered single-mode glass fiber sensor probe 2 with microholes, a photodetector 3, and a control and processing circuit 4. The input end of the tapered single-mode optical fiber sensing probe 2 with a microhole structure is connected to the light source module 1 with a pigtail through a single-mode glass optical fiber, and the output end of the tapered single-mode optical fiber sensing probe 2 with a microhole is connected through a single-mode optical fiber. The molded glass fiber is connected to the input end of the photodetector 3 with a pigtail, and the output end of the photodetector 3 is connected to the input end of the control and processing circuit 4 .

[0031] The light source module 1 is composed of a C-band semiconductor light source, a signal generator and a driving circuit, and the ...

Embodiment 2

[0034] Embodiment 2 The mode of operation of the device of the present invention

[0035] The radiated light of the light source after internal modulation enters the optical fiber sensing probe 2 and the photodetector 3 through the pigtail, and the optical power received by the photodetector 3 is related to the refractive index of the medium around the optical fiber probe. When the tapered region of the optical fiber sensing probe 2 is immersed in the liquid to be measured, if the refractive index of the liquid to be measured is large, the power loss in the fiber optic probe will increase; if the refractive index of the liquid to be measured becomes small, the power loss in the fiber optic probe The loss will be reduced. That is to say, the optical power detected by the photodetector 3 changes with the change of the refractive index of the liquid to be measured. The electrical signal obtained after photoelectric conversion by the photodetector 3 is amplified by the signal amp...

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Abstract

The invention belongs to the technical field of optical fiber sensing, and particularly relates to a glass optical fiber liquid refractive index sensing device based on a tapering area micropore structure. The glass optical fiber liquid refractive index sensing device structurally comprises a light source module (1), an optical fiber sensing probe (2), a photoelectric detector (3) and a control and processing circuit (4), wherein the optical fiber sensing probe (2) is a columnar sealing micropore which transversely penetrates through an optical fiber and is formed in the isosceles area of a tapering single mode fiber. Light emitted from a light source passes through the optical fiber sensing probe and carries the refractive index information of the liquid around the optical fiber sensing probe (2), the refractive index information is converted into an electrical signal via the detection of the photoelectric detector, and the refractive index of to-be-detected liquid can be obtained by delivering the electrical signal to the control and processing circuit (4) for processing. According to the invention, the tapering optical fiber is drawn through the conventional process, and the tapering micropore is processed by adopting femtosecond laser; compared with the traditional tapering optical fiber sensor, the glass optical fiber liquid refractive index sensing device has the advantages of high mechanical strength, high measuring sensitivity, easiness in processing and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a glass optical fiber liquid refractive index sensing device based on a micropore structure in a cone region. Background technique [0002] With the development of science and technology, the measurement of liquid refractive index is of great significance to many fields, such as the measurement of solution concentration in chemistry, real-time monitoring of bacterial growth in biochemistry, and water quality inspection in environmental monitoring. Measurements, even in the beverage industry require detection of the refractive index of liquids. [0003] Due to its light weight, small loss of optical signal, and large transmission capacity, optical fiber has been widely used in the measurement of liquid refractive index. The optical fiber sensing technologies for liquid refractive index measurement mainly include fiber grating sensors, fiber coating senso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41
Inventor 徐晓峰范瑞琴康智慧韦珏
Owner JILIN UNIV
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