Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG)

A fiber grating and chemical solution technology, applied in color/spectral characteristic measurement, measurement devices, material analysis through optical means, etc., can solve problems such as impracticability and high risk, and achieve accurate measurement results and high safety , real-time acquisition and remote control effects

Inactive Publication Date: 2014-02-26
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and system for measuring the concentration of chemical solutions using fiber gratings, which can effectively solve the problems in the prior art, especially the danger of using fiber gratings to measure the concentration of chemical solutions is relatively high and cannot be realized online. , Accurately measure the concentration of chemical solutions

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  • Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG)
  • Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG)
  • Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG)

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Embodiment 1

[0033] Embodiment 1 of the present invention: A method for measuring the concentration of a chemical solution by using a fiber grating, including the following steps:

[0034] S1, broadband light enters the coupler through the fiber isolator for separation;

[0035] S2, using double FBG single-ended lithography to reduce the cladding or core radius of the fiber grating to form an FBG sensor; the light wave evanescent field is transmitted from the FBG sensor and directly interacts with the solution, and the reflected light is input to the spectrum analyzer;

[0036] S3: The spectrum analyzer analyzes and measures the change information of the wavelength of the fiber grating, and sends the data information to the remote control terminal for demodulation, analysis and processing, so as to realize real-time collection of solution concentration.

[0037] In step S2, the double FBG single-ended photolithography method refers to first placing the sensitive grating part on a precisely moving ...

Embodiment 2

[0054] Embodiment 2: A method for measuring the concentration of a chemical solution by using a fiber grating, including the following steps:

[0055] S1, broadband light enters the coupler through the fiber isolator for separation;

[0056] S2, using double FBG single-ended lithography to reduce the cladding or core radius of the fiber grating to form an FBG sensor; the light wave evanescent field is transmitted from the FBG sensor and directly interacts with the solution, and the reflected light is input to the spectrum analyzer;

[0057] S3: The spectrum analyzer analyzes and measures the change information of the wavelength of the fiber grating, and sends the data information to the remote control terminal for demodulation, analysis and processing, so as to realize real-time collection of solution concentration.

[0058] A system for measuring the concentration of a chemical solution by using a fiber grating to implement the above method includes: a broadband light source 1, an op...

Embodiment 3

[0059] Embodiment 3: A method for measuring the concentration of a chemical solution by using a fiber grating, including the following steps:

[0060] S1, broadband light enters the coupler through the fiber isolator for separation;

[0061] S2, using double FBG single-ended lithography to reduce the cladding or core radius of the fiber grating to form an FBG sensor; the light wave evanescent field is transmitted from the FBG sensor and directly interacts with the solution, and the reflected light is input to the spectrum analyzer;

[0062] S3: The spectrum analyzer analyzes and measures the change information of the wavelength of the fiber grating, and sends the data information to the remote control terminal for demodulation, analysis and processing, so as to realize real-time collection of solution concentration.

[0063] A system for measuring the concentration of a chemical solution by using a fiber grating to implement the above method includes: a broadband light source 1, an op...

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Abstract

The invention discloses a method and system for measuring the concentration of a chemical solution by fiber bragg gratings (FBG). The system comprises a broadband light source 1, a fiber isolator 12, a coupler 2, an FBG sensor 3, a spectrum analyzer 4 and a computer control end 5, wherein the fiber isolator 12 is respectively connected with the broadband light source 1 and a coupler 2, the coupler 2 is respectively connected with the FBG sensor 3 and the spectrum analyzer 4, and the spectrum analyzer 4 is connected with the computer control end 5. According to the invention, a double FBG single-end photoetching method is used to reduce the radius of claddings or fiber cores of fiber bragg gratings, so as to obtain a double fiber bragg grating structure which is sensitive to the external refractive index, and thus the FBG sensor is formed so that the FBG propagation mode is sensitive to the change of concentration of a solution outside, and therefore the on-ling and real-time acquisition and remote control for the concentration of the solution can be realized through detection on the change of reflection wavelength of fiber bragg gratings under the support of equipment such as the coupler, the FBG sensor, the spectrum analyzer.

Description

Technical field [0001] The invention relates to a method and system for measuring the concentration of a chemical solution by using an optical fiber grating, and belongs to the technical field of chemical solution concentration measurement. Background technique [0002] Concentration is one of the main parameters that characterize the characteristics of the solution, and it is also an important measurement parameter in industrial and agricultural production and scientific research experiments. Many physical and chemical properties of substances are susceptible to concentration. Too high or too low a concentration will affect the quality of the product. The traditional concentration measurement method is susceptible to electromagnetic interference and has a complex structure, and cannot meet the requirements of high-precision online measurement in flammable, explosive, and corrosive occasions. [0003] In recent years, long-period fiber gratings have some research applications in c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/17
Inventor 吴朝霞王立夫毛蕊金伟
Owner 东北大学秦皇岛分校
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