CN111208088A - Optical fiber heavy ion sensor based on Fabry-Perot interference - Google Patents
Optical fiber heavy ion sensor based on Fabry-Perot interference Download PDFInfo
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- 239000005388 borosilicate glass Substances 0.000 claims abstract description 60
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 10
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- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 229920001661 Chitosan Polymers 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
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- 238000000576 coating method Methods 0.000 claims description 3
- 229920006335 epoxy glue Polymers 0.000 claims description 3
- 238000001338 self-assembly Methods 0.000 claims description 3
- 125000001453 quaternary ammonium group Chemical group 0.000 claims 1
- 150000002500 ions Chemical class 0.000 abstract description 39
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 33
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/7769—Measurement method of reaction-produced change in sensor
- G01N2021/7779—Measurement method of reaction-produced change in sensor interferometric
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses an optical fiber heavy ion sensor based on Fabry-Perot interference, which comprises a single-mode optical fiber, a quartz glass capillary tube, high borosilicate glass and an active layer; the single-mode optical fiber is inserted into the through hole of the quartz glass capillary, and one side end of the quartz glass capillary is fixedly connected with one side end of the high borosilicate glass; the other side end of the high borosilicate glass is fixedly connected with one side end of the active layer. The invention also discloses a preparation method of the optical fiber heavy ion sensor based on Fabry-Perot interference. The method has the advantages that the advantages of optical fiber interference and the slight change of the refractive index and the thickness caused by the adsorption of heavy metal ions by the modified high molecular compound are utilized, so that the change of interference fringes is caused, the concentration of the heavy metal ions in the environment can be rapidly, conveniently and highly sensitively measured according to a high-resolution demodulation algorithm, and the heavy metal pollution condition in the environment or food can be effectively evaluated. Meanwhile, the interference fringe variation caused by the environmental temperature variation of the active layer can be eliminated through the interference fringe variation information caused by the thickness variation of the high borosilicate.
Description
Technical Field
The invention relates to the field of heavy metal ion detection, in particular to an optical fiber heavy ion sensor based on Fabry-Perot interference and a preparation method thereof.
Background
With the rapid development of national economy and society, various industrial wastewater discharge, sewage irrigation, unreasonable and practical chemical fertilizers, air pollution and the like are continuously generated, and the phenomenon that the environment, water resources and soil are polluted by heavy metals is increasingly serious. The heavy metal ions are difficult to degrade and are easy to be absorbed by human bodies continuously through drinking water or food chains, and the heavy metal ions are deposited and enriched in the human bodies, are toxic to the human bodies after exceeding a certain concentration, cause direct harm to the human bodies and endanger the health of the human bodies. After being absorbed by human body, heavy metal elements can cause protein denaturation, enzyme inactivation and structural and functional damage to histiocytes, so that the detection of the content of heavy metal is very important for the healthy life of people, and the research on a high-sensitivity detection method for heavy metal ion selectivity is of great significance.
The traditional detection method for heavy metal content mainly comprises atomic absorption spectrometry, atomic emission spectrometry, atomic fluorescence spectrometry, mass spectrometry, enzyme inhibition method and electrochemical analysis detection method. The analysis and test methods of the instruments have respective advantages, but have the defects of complex detection, long time consumption, complex operation and the like, and always troubles the detection of the heavy metal ions at present. There is an urgent need for a method for conveniently, rapidly and highly sensitively detecting the content of heavy metal ions.
Disclosure of Invention
The invention aims to provide an optical fiber heavy ion sensor based on Fabry-Perot interference, which solves the problems in the prior art and can efficiently measure the content of heavy metal ions in the environment.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an optical fiber heavy ion sensor based on Fabry-Perot interference, which comprises a single-mode optical fiber, a quartz glass capillary tube, high borosilicate glass and an active layer.
The single-mode optical fiber is inserted into the quartz glass capillary, and one end of the single-mode optical fiber extends out of one end of the quartz glass capillary; the other end of the quartz glass capillary tube is fixedly connected with one end of the high borosilicate glass;
the other end of the high borosilicate glass is fixedly connected with one end of the active layer.
Preferably, the inner diameter of the quartz glass capillary is 126-128 microns, and the outer diameter is 1-2.5 mm; the thickness of the high borosilicate glass is 100-500 microns.
Preferably, the end face of the quartz glass capillary tube contacting the high borosilicate glass and the end face of the single mode optical fiber contacting the high borosilicate glass should have a finish of grade 12 or more.
Preferably, the single-mode optical fiber and the quartz glass capillary are fixedly connected through epoxy glue.
Meanwhile, the invention also discloses a preparation method of the optical fiber heavy ion sensor based on Fabry-Perot interference, which comprises the following steps:
(1) preparing a single-mode optical fiber, coating epoxy resin optical cement on the peripheral surface of the single-mode optical fiber, inserting the single-mode optical fiber into a through hole of a quartz glass capillary to form a whole with a side end surface being flush, and placing the whole for 1-15 minutes at the temperature of 80-150 ℃; polishing the flush side end faces of the single-mode optical fiber and the quartz glass capillary to a finish of grade 12 or higher;
(2) high borosilicate glass with the diameter of 1-2.5 mm is processed into the thickness of 100-500 microns, and then one end surface of the high borosilicate glass is polished to the finish grade of 12, and the other end surface of the high borosilicate glass is polished to the finish grade of 8-9;
(3) placing the quartz glass capillary tube fixed with the single-mode optical fiber prepared in the step (1) and the high borosilicate glass polished in the step (2) into an alcohol solution, and cleaning for 3-10 minutes by using ultrasonic waves;
(4) fixing the polished surface of the quartz glass capillary tube with the single-mode fiber inserted in the through hole and the side end surface of the polished high borosilicate glass by an optical cement method;
(5) preparing an active layer, and preparing the active layer on the end face of the other side of the high borosilicate glass by a self-assembly method, wherein the end face of the exposed side of the active layer has the smoothness which can ensure that certain optical power is reflected.
Preferably, the active layer in step (5) is made of modified quaternary ammonium salt chitosan.
The invention discloses the following technical effects: the invention utilizes the advantages of optical fiber interference and the slight change of the refractive index and the thickness of the modified macromolecular compound after the heavy metal ions are absorbed, thereby causing the change of interference fringes, and can quickly, conveniently and highly sensitively measure the concentration of the heavy metal ions in the environment according to a high-resolution demodulation algorithm, thereby effectively evaluating the heavy metal pollution condition in the environment or food. Meanwhile, the thickness change of the high borosilicate glass can be caused when the environmental temperature changes, and the thickness change of the active layer can be caused at the same time, so that the interference fringe variation quantity of the active layer caused by the environmental temperature change can be eliminated through the interference fringe variation information caused by the thickness change of the high borosilicate glass, and the measurement precision of heavy metal ions is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a structural diagram of an optical fiber heavy ion sensor based on Fabry-Perot interference according to the present invention;
FIG. 2 is a schematic diagram of optical signal transmission of an optical fiber heavy ion sensor based on Fabry-Perot interference according to the present invention;
FIG. 3 is a schematic diagram of a system for detecting heavy metal ions by using an optical fiber heavy ion sensor based on Fabry-Perot interference according to the present invention;
the optical fiber comprises a single-mode optical fiber 1, a quartz glass capillary 2, a borosilicate glass 3, an active layer 4, a first reflecting surface 5, a second reflecting surface 6, an exposed side end surface of the active layer 7, an optical signal reflected by the end surface of the quartz glass capillary and the interface of the borosilicate glass 8, an optical signal reflected by the interface of the borosilicate glass and the active layer 9, an optical signal reflected by the surface of the active layer 10, a light source 11, an optical fiber coupler 12, a container for storing heavy metal ion solution 13, a heavy metal ion sensor 14 and a signal demodulation and output display device 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides an optical fiber heavy ion sensor based on fabry-perot interference, which includes a single mode optical fiber 1, a quartz glass capillary 2, a borosilicate glass 3, and an active layer 4. Structurally, the peripheral surface of the single-mode optical fiber 1 is coated with epoxy glue OE188 and then inserted into the through hole of the quartz glass capillary tube 2, and the end faces of one side of the single-mode optical fiber and one side of the single-mode optical fiber are flush, and the end face of one side of the quartz glass capillary tube 2 is fixedly connected with the end face of one side of the high borosilicate glass 3; the other side end face of the high borosilicate glass 3 is fixedly connected with one side end face of the active layer 4.
Further optimizing the scheme, the inner diameter of the quartz glass capillary tube 2 is 126-128 microns, and the outer diameter is 1-2.5 mm; the thickness of the high borosilicate glass 3 is 100-500 microns, and the end face of the quartz glass capillary 2, which is in contact with the high borosilicate glass 3, and the end face of the single-mode optical fiber 1, which is in contact with the high borosilicate glass 3, have the finish degree of 12 or above.
Meanwhile, the invention also provides a preparation method of the optical fiber heavy ion sensor based on Fabry-Perot interference, which comprises the following specific contents:
preparing a single-mode optical fiber 1, cleaning the single-mode optical fiber 1 according to a processing method of an optical fiber end face, then cutting the end face of the single-mode optical fiber 1 flat by using an optical fiber cutter, coating epoxy resin optical cement OE188 on the peripheral surface of the single-mode optical fiber 1, inserting the epoxy resin optical cement OE188 into a through hole of a quartz glass capillary tube 2 with the inner diameter of 126-. And simultaneously ensuring that the single mode optical fiber 1 and the quartz glass capillary tube 2 form a whole with level side end faces, finally placing the whole at the temperature of 80-150 ℃ for 1-15 minutes, and then polishing the level side end faces of the single mode optical fiber 1 and the quartz glass capillary tube 2 to the finish degree of 12 or higher.
High borosilicate glass with a diameter of 1-2.5 mm is processed to a thickness of 100-500 microns and then polished to a 12-grade finish on one end face and a 8-9 grade finish on the other end face. Then the polished high borosilicate glass 3 is put into alcohol solution and cleaned by ultrasonic cleaning for 3 to 10 minutes. Then, the side end face of the borosilicate glass 3 having a finish of 12 degrees was fixed to the end face of the quartz glass capillary 2 by a photo-adhesive method.
One side end face of an active layer 4 made of modified quaternary ammonium salt chitosan is directly prepared on an end face 6 of the high borosilicate glass through a self-assembly method. The other end face 7 of the active layer 4 has a good finish to ensure that a certain optical power is reflected.
The measurement principle of the optical fiber heavy ion sensor based on Fabry-Perot interference according to the present invention is described below with reference to FIGS. 2-3.
As shown in fig. 2, the silica glass capillary 2 and the high borosilicate glass 3 are physically formed into a first reflecting surface having an end surface 5 as a reflecting surface where the silica glass capillary 2 and the high borosilicate glass 3 are in contact with each other, due to the difference in refractive index; the refractive indexes of the high borosilicate glass 3 and the active layer 4 are different, and a second reflecting surface 6 is formed; the first reflecting surface 5 and the second reflecting surface 6 form two reflecting surfaces of a first fabry-perot cavity, and the second reflecting surface 6 and the surface 7 of the active layer 4 form two reflecting surfaces of a second fabry-perot cavity. The optical signal of the optical fiber is transmitted from left to right, when the optical signal is transmitted to the second reflecting surface 6, partial reflection 8 is generated, namely the optical signal reflected by the end surface of the quartz glass capillary 2 and the interface of the borosilicate glass 3, the residual optical signal is transmitted to the right continuously in the borosilicate glass 3, when the optical signal is transmitted to the interface 6, namely the second reflecting surface, partial reflection 9 is generated, namely the optical signal reflected by the interface of the borosilicate glass 3 and the active layer 4, then the residual optical signal is transmitted to the right continuously in the active layer 4, finally reflection is generated on the outer surface 7 of the active layer 4, the optical signal 8 reflected by the end surface of the quartz glass capillary 2 and the interface of the borosilicate glass 3 and the optical signal 9 reflected by the interface of the borosilicate glass and the active layer interfere, and the optical signal 9 reflected by the interface of the borosilicate glass 3 and the active layer 4 and the optical signal 10 reflected by the surface of the active, the optical signal 8 reflected by the end face of the quartz glass capillary 2 and the interface of the borosilicate glass 3 and the optical signal 10 reflected by the surface of the active layer also interfere (this interference signal is negligible when the sensor signal is extracted). After the active layer 4 adsorbs the heavy metal ions, the refractive index or the thickness of the active layer is changed, and interference signals generated by an optical signal 9 reflected by the interface between the high borosilicate glass 3 and the active layer 4 and an optical signal 10 reflected by the surface of the active layer are changed to reflect the change of the content of the heavy metal ions; when the ambient temperature changes, the thickness of the borosilicate glass 3 also changes, interference signals generated by an optical signal 8 reflected by the end face of the quartz glass capillary and the interface of the borosilicate glass and an optical signal 9 reflected by the interface of the borosilicate glass and the active layer will change, interference signals generated by the optical signal 9 reflected by the interface of the borosilicate glass 3 and the active layer 4 and an optical signal 10 reflected by the surface of the active layer will also change, and therefore, the total change generated by the optical signal 9 reflected by the interface of the borosilicate glass 3 and the active layer 4 and the optical signal 10 reflected by the surface of the active layer can eliminate errors caused by temperature when the concentration of heavy metal ions is detected according to the change of the interference signals 8 and 9 reflected by the interface.
As shown in fig. 3, the heavy metal ion sensor 14 is disposed in a container 13 for storing a heavy metal ion solution, an optical signal emitted by the light source 11 reaches the heavy metal ion sensor 14 through the optical fiber coupler 12 and the optical fiber, and a reflected interference signal generated by the heavy metal ion sensor 14 by acquiring the content of the heavy metal ion is transmitted to the signal demodulation and output display device 15 through the optical fiber coupler 12 and the optical fiber for demodulation and output display.
The invention utilizes the advantages of optical fiber interference and the slight change of the refractive index and the thickness of the modified macromolecular compound after the heavy metal ions are absorbed, thereby causing the change of interference fringes, and can quickly, conveniently and highly sensitively measure the concentration of the heavy metal ions in the environment according to a high-resolution demodulation algorithm, thereby effectively evaluating the heavy metal pollution condition in the environment or food. Meanwhile, the thickness change of the high borosilicate glass can be caused when the environmental temperature changes, and the thickness change of the active layer can be caused at the same time, so that the interference fringe variation quantity of the active layer caused by the environmental temperature change can be eliminated through the interference fringe variation information caused by the thickness change of the high borosilicate glass, and the measurement precision of heavy metal ions is improved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. An optical fiber heavy ion sensor based on Fabry-Perot interference is characterized by comprising a single-mode optical fiber, a quartz glass capillary tube, high borosilicate glass and an active layer;
the single-mode optical fiber is inserted into the quartz glass capillary, and one end of the single-mode optical fiber extends out of one end of the quartz glass capillary; the other end of the quartz glass capillary tube is fixedly connected with one end of the high borosilicate glass;
the other end of the high borosilicate glass is fixedly connected with one end of the active layer.
2. The Fabry-Perot interference based optical fiber heavy ion sensor according to claim 1, wherein the quartz glass capillary has an inner diameter of 126-128 μm and an outer diameter of 1-2.5 mm; the thickness of the high borosilicate glass is 100-500 microns.
3. The Fabry-Perot interference based fiber optic heavy ion sensor of claim 1, wherein the end face of the quartz glass capillary in contact with the borosilicate glass, and the end face of the single mode fiber in contact with the borosilicate glass, are all of a 12-step or higher finish.
4. The fabry-perot interference based fiber optic heavy ion sensor of claim 1, wherein: the single-mode optical fiber and the quartz glass capillary are fixedly connected through epoxy glue.
5. Method for preparing a fabry-perot interference based fiber optic heavy ion sensor according to one of claims 1 to 4, characterized in that it comprises the following steps:
(1) preparing a single-mode optical fiber, coating epoxy resin optical cement on the peripheral surface of the single-mode optical fiber, inserting the single-mode optical fiber into a through hole of a quartz glass capillary to form a whole with a side end surface being flush, and placing the whole for 1-15 minutes at the temperature of 80-150 ℃; then, the flush side end faces of the single-mode optical fiber and the quartz glass capillary are polished to a finish degree of 12 or higher;
(2) high borosilicate glass with the diameter of 1-2.5 mm is processed into the thickness of 100-500 microns, and then one end surface of the high borosilicate glass is polished to the finish grade of 12, and the other end surface of the high borosilicate glass is polished to the finish grade of 8-9;
(3) placing the quartz glass capillary tube fixed with the single-mode optical fiber prepared in the step (1) and the high borosilicate glass polished in the step (2) into an alcohol solution, and cleaning for 3-10 minutes by using ultrasonic waves;
(4) fixing the polished surface of the quartz glass capillary tube with the single-mode fiber inserted in the through hole and the side end surface of the polished high borosilicate glass by an optical cement method;
(5) preparing an active layer, and preparing the active layer on the end face of the other side of the high borosilicate glass by a self-assembly method, wherein the end face of the exposed side of the active layer has the smoothness which can ensure that certain optical power is reflected.
6. The preparation method of the Fabry-Perot interference-based optical fiber heavy ion sensor according to claim 5, wherein the active layer in the step (5) is made of modified quaternary ammonium chitosan.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010184445.5A CN111208088B (en) | 2020-03-17 | 2020-03-17 | Optical fiber heavy metal ion sensor based on Fabry-Perot interference |
| PCT/CN2020/109689 WO2021184675A1 (en) | 2020-03-17 | 2020-08-18 | Fabry-pérot interference-based optical fiber heavy metal ion sensor |
| LU102532A LU102532B1 (en) | 2020-03-17 | 2021-02-16 | Optical Fiber Heavy Metal Ion Sensor Based on Fabry-Perot Interferometer |
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| CN202010184445.5A CN111208088B (en) | 2020-03-17 | 2020-03-17 | Optical fiber heavy metal ion sensor based on Fabry-Perot interference |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021184675A1 (en) * | 2020-03-17 | 2021-09-23 | 广东海洋大学 | Fabry-pérot interference-based optical fiber heavy metal ion sensor |
| CN117606641A (en) * | 2023-11-30 | 2024-02-27 | 哈尔滨工程大学 | Optical fiber interference type sensor based on germanium wafer and manufacturing method thereof |
| CN117805041A (en) * | 2023-12-01 | 2024-04-02 | 重庆邮电大学 | Detection device and manufacturing method for pollution of heavy metal particles in water based on capillary optical fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486019B (en) * | 2022-01-12 | 2023-07-07 | 西北工业大学 | Optical fiber Fabry-Perot pressure sensor for eliminating interference of third cavity and MEMS manufacturing method |
| CN115164954B (en) * | 2022-07-04 | 2024-07-19 | 中国人民解放军国防科技大学 | Preparation method of two-dimensional material Fabry-Perot type point optical fiber sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109580546A (en) * | 2018-12-19 | 2019-04-05 | 天津大学 | A kind of Fabry-perot optical fiber gas refracting index and temperature sensor and system, measurement method |
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| WO2021184675A1 (en) * | 2020-03-17 | 2021-09-23 | 广东海洋大学 | Fabry-pérot interference-based optical fiber heavy metal ion sensor |
| CN117606641A (en) * | 2023-11-30 | 2024-02-27 | 哈尔滨工程大学 | Optical fiber interference type sensor based on germanium wafer and manufacturing method thereof |
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