LU102532B1 - Optical Fiber Heavy Metal Ion Sensor Based on Fabry-Perot Interferometer - Google Patents
Optical Fiber Heavy Metal Ion Sensor Based on Fabry-Perot Interferometer Download PDFInfo
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- LU102532B1 LU102532B1 LU102532A LU102532A LU102532B1 LU 102532 B1 LU102532 B1 LU 102532B1 LU 102532 A LU102532 A LU 102532A LU 102532 A LU102532 A LU 102532A LU 102532 B1 LU102532 B1 LU 102532B1
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- quartz glass
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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
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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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- Immunology (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention discloses an optical fiber heavy metal ion sensor based on Fabry-Perot interferometer, comprising a single-mode optical fiber, a quartz glass capillary tube, a high borosilicate glass and an active layer, wherein the single-mode optical fiber is inserted into a through-hole of the quartz glass capillary tube, one end of the quartz glass capillary tube is fixedly connected with one end of the high borosilicate glass, and the other end of the quartz glass capillary tube is fixedly connected with one end of the active layer. The present invention also discloses a method for preparing the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer. Using the advantages of optical fiber interference and modified polymer compounds to adsorb heavy metal ions will lead to slight changes in refractive index and thickness, resulting in the change of interference fringe.
Description
DESCRIPTION Optical Fiber Heavy Metal lon Sensor Based on Fabry-Perot Interferometer
TECHNICAL FIELD The present invention refers to the field of heavy metal ion test, in particular to an optical fiber heavy metal ion sensor based on Fabry-Perot interferometer and preparation method thereof.
BACKGROUND With the rapid development of national economy and society, various kinds of industrial waste water discharge, sewage irrigation, unreasonable and practical fertilizer, air pollution and other phenomena continue to occur, and the heavy metal pollution of environment, water resources and soil is increasingly serious. Heavy metal ions are very difficult to be degraded and are easily absorbed by the human body through drinking water or food chain. Heavy metal ions are deposited and enriched in the human body, and they will be toxic to the human body if the concentration exceeds a certain level, causing direct harm to the body and endangering human health. Heavy metal elements absorbed by the human body will lead to protein denaturation, enzyme inactivity, structural and functional damage to the tissue cells. Therefore, the detection of heavy metal content is very important for people's healthy life, and it is of great significance to study a selective and high sensitive detection method for heavy metal ions.
The traditional detection methods of heavy metal content mainly comprise 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 these instruments have their own advantages, but they also have disadvantages such as cumbersome detection, time-consuming and complicated operation, which have plagued the current detection of heavy metal ions. Now, a convenient and sensitive method for detecting heavy metal ions is urgently needed.
SUMMARY The purpose of the invention is to provide an optical fiber heavy metal ion sensor based on Fabry-Perot interferometer for solving the problems in the prior art, and the content of heavy metal ions in the environment can be determined efficiently.
For realizing the above-mentioned purpose, the present invention adopts the following technical solution: the present invention provides an optical fiber heavy metal ion sensor based on Fabry-Perot interferometer, comprising a single-mode optical fiber, a quartz glass capillary tube, a high borosilicate glass and an active layer; the single mode fiber is inserted into the quartz glass capillary, one end of the single mode fiber extends out of one end of the quartz glass capillary, and the other end of the quartz glass capillary 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 quartz glass capillary tube has an inner diameter of 126-128 microns and an outer diameter of 1-2.5 mm; and the thickness of the high borosilicate glass is 100-500 microns.
Preferably, the end face of the quartz glass capillary tube in contact with the high borosilicate glass and the end face of the single-mode optical fiber in contact with the high borosilicate glass shall have a finish of Grade 12 or above.
Preferably, the single-mode optical fiber and the quartz glass capillary tube are fixedly connected by an epoxy adhesive.
Meanwhile, the present invention also discloses a method for preparing the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer, comprising the following steps: (1) preparing the single-mode optical fiber, coating the circumferential surface of the single-mode optical fiber with epoxy resin optical adhesive and inserting it into a through-hole of the quartz glass capillary tube to form a flat whole, placing it at the temperature of 80-150°C for 1-15 minutes, and then polishing the flat side end faces of both the single-mode optical fiber and the quartz glass capillary tube to a finish of Grade 12 or above; (2) processing the high borosilicate glass with a diameter of 1-2.5 mm to a thickness of 100-500 microns, and then polishing one end face to a finish of Grade 12 and the other end face to a finish of Grade 8-9;
(3) placing the quartz glass capillary tube prepared in Step (1) and fixedly equipped with the single-mode optical fiber and the high borosilicate glass polished in Step (2) in alcohol solution for cleaning by ultrasonic wave for 3-10 minutes; (4) fixing the polished surface of the quartz glass capillary tube with the single-mode fiber inserted into the through-hole and the side end face of the polished high borosilicate glass by the optical glue method; and (5) preparing the active layer, forming it on the other end face of the high borosilicate glass by the self-assembly method, and the end surface of the exposed side of the active layer shall be smooth enough to reflect a certain amount of light power.
Preferably, the active layer in Step (5) is made from modified quaternary ammonium sait chitosan.
The present invention discloses the following technical effects: using the advantages of optical fiber interference and modified polymer compounds to adsorb heavy metal ions will lead to slight changes in refractive index and thickness, resulting in the change of interference fringe. Based on the high-resolution demodulation aigorithm, the concentration of heavy metal ions in the environment can be quickly, conveniently and sensitively measured, and the pollution of heavy metal in the environment or food can be effectively evaluated. Meanwhile, as the change of ambient temperature may cause thickness change of high borosilicate glass, as well as the thickness change of the active layer, the change information of interference fringe caused by the thickness change of high borosilicate glass can be used for eliminating the change of interference fringe caused by the change of ambient temperature in the active layer, so as to improve the measurement accuracy of heavy metal ions.
BRIEF DESCRIPTION OF THE FIGURES To describe the technical solution in the embodiment in the present invention or in the prior art in a more clear way, figures requiring to be used in the embodiment description are simply introduced as follows. Apparently, the figures described below are only some embodiments of the present invention. For common technicians in this field, other figures can be also obtained based on these figures with no creative works contributed.
Fig. 1 shows a structure diagram of the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer in the present invention; Fig. 2 shows a schematic diagram of optical signal transmission of the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer in the present invention; and Fig. 3 shows a system diagram of heavy mental ion detection by using the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer in the present invention; wherein 1 - single-mode optical fiber, 2 - quartz glass capillary tube, 3 - high borosilicate glass, 4 - active layer, 5 - a first reflecting surface, 6 - a second reflecting surface, 7 - exposed side end face of active layer, 8 - optical signal reflected from the end face of quartz glass capillary tube and interface of high borosilicate glass, 9 - optical signal reflected from the interface between the borosilicate glass and the active layer, 10 - optical signal reflected from the surface of the active layer, 11 - light source, 12 - optical fiber coupler, 13 - container for storing heavy metal ion solution, 14 - heavy metal ion sensor, 15 - signal demodulation and output display device.
DESCRIPTION OF THE INVENTION The following is clear and complete description on the technical solution in the embodiments of the present invention by combining with the drawings attached in embodiments of the present invention. Obviously, the embodiments described are just partial embodiments of the present invention, not all the embodiments. In view of the embodiments of the present invention, other all embodiments obtained by common technicians in this field with no creative works contributed belong to the protection range of the present invention.
In order to make the above purposes, characteristics and advantages of the present invention more obvious and understandable, the specific implementation mode of the present invention is further described in detail in combination with the attached drawings below.
A shown in Fig. 1, the present invention provides an optical fiber heavy metal ion sensor based on Fabry-Perot interferometer, comprising a single- mode optical fiber 1, a quartz glass capillary tube 2, a high borosilicate glass 3 and an active layer 4. Structurally, the peripheral surface of the single-mode optical fiber 1 is coated with epoxy adhesive OE188 and then inserted into the through hole of the quartz glass capillary tube 2 and one side end face of the two is flush; one side end face of the quartz glass capillary tube 2 is fixedly connected with one side end face of the high borosilicate glass 3; and the other side end face of the high borosilicate glass 3 is fixedly connected with the one side end face of the active layer 4.
The technical solution is further optimized, the quartz glass capillary tube 2 has an inner diameter of 126-128 microns and an outer diameter of 1-2.5 mm; and the thickness of the high borosilicate glass 3 is 100-500 microns. Meanwhile, the end face of the quartz glass capillary tube 2 in contact with the high borosilicate glass 3 and the end face of the single-mode optical fiber 1 in contact with the high borosilicate glass 3 shall have a finish of Grade 12 or above.
Meanwhile, the present invention also provides a method for preparing the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer, comprising the following steps: preparing the single-mode optical fiber 1, cleaning the single-mode optical fiber 1 according to the processing method of optical fiber end face, and then cutting the end face of the single-mode optical fiber 1 to be flat with the fiber cutting knife, coating the circumferential surface of the single-mode optical fiber 1 with epoxy resin optical adhesive OE188 and inserting it into a through-hole of the quartz glass capillary tube 2 with an inner diameter of 126-128 microns and an outer diameter of 1-25 mm, and pulling the single-mode optical fiber 1 backwards and forwards for many times, so that the epoxy resin optical adhesive OE188 is evenly distributed between the inner walls of the single-mode fiber 1 and the quartz glass capillary tube 2, and that the accumulated pressure of the single-mode fiber 1 in the through-hole of the quartz glass capillary 2 is almost the same at all positions; meanwhile, the single-mode optical fiber 1 and the quartz glass capillary tube 2 shall also be ensured to form a whole with a flat side face, and finally placed at 80-150°C for 1-15 minutes, and then the flat side faces of the single-mode optical fiber 1 and the quartz glass capillary tube 2 shall be polished to a finish of Grade 12 or above; processing the high borosilicate glass with a diameter of 1-2.5 mm to a thickness of 100-500 microns, and then polishing one end face to a finish of Grade 12 and the other end face to a finish of Grade 8-9; placing the polished high borosilicate glass 3 in alcohol solution for cleaning by ultrasonic wave for 3-10 minutes, and wiping up; fixing the side end face of the high borosilicate glass 3 with a finish of Grade 12 onto the end face of the quartz glass capillary tube 2 by the optical adhesive method; directly preparing one side end face of the active layer 4 made from modified quaternary ammonium salt chitosan onto the end face 6 of the high borosilicate glass by the self-assembly method; the other side end face 7 of the active layer 4 has a good finish to ensure that a certain amount of light power can be reflected.
The following is the description of the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer in the present invention by combining with Fig. 2 - Fig. 3.
As shown in Fig. 2, as the refractive index between the quartz glass capillary tube 2 and the high borosilicate glass 3 is different, the end face 5 contacting with the quartz glass capillary tube 2 and the high borosilicate glass 3 is formed as a first reflective surface of the reflective surface; the refractive index between the high borosilicate glass 3 and the active layer 4 is also different, a second reflective surface 6 is formed; the first reflective surface 5 and the second reflective surface 6 constitute two reflective surfaces of the first Fabry-Perot cavity, and the second reflective surface 6 and the surface 7 of the active layer 4 constitute two reflective surfaces of the second Fabry-Perot cavity.
The optical signal of the optical fiber is transmitted from left to right, and the partial reflection 8 is generated when the optical signal is transmitted to the second reflecting surface (6), that is, the optical signal reflected from the interface between the end face of the quartz glass capillary tube (2) and the high borosilicate glass (3); the remaining optical signals continue to be transmitted to the right in the high borosilicate glass 3, and partial reflection 9 will be generated when they are transmitted to the interface 6 (the second reflecting surface), that is, the optical signals reflected from the interface between the high borosilicate glass 3 and the active layer 4; then the remaining optical signals continue to be transmitted to the right in active layer 4, and finally reflected on the outer surface 7 of active layer 4; there will be an interference signal generated by the optical signal 8 reflected from the interface between the end face of the quartz glass capillary tube 2 and the high borosilicate glass 3 and the optical signal 9 reflected from the interface between the high borosilicate glass and the active layer; there will be an interference signal generated by the optical signal 9 reflected from the interface between the high borosilicate glass 3 and the active layer 4 and the optical signal 10 reflected from the surface of the active layer; there will also be an interference signal generated by the optical signal 8 reflected from the interface between the end face of the quartz glass capillary tube 2 and the high borosilicate glass 3 and the optical signal 10 reflected from the surface of the active layer (this interference signal can be ignored during extraction of the sensing signal). When the active layer 4 adsorbs heavy metal ions, refractive index or thickness thereof will change.
In this case, the optical signal 9 reflected from the interface between the high borosilicate glass 3 and the active layer 4 and the optical signal 10 reflected from the surface of the active layer will change, reflecting the change of the content of heavy metal ions.
The thickness of the high borosilicate glass 3 changes as the ambient temperature changes.
In this case, the interference signal generated by the optical signal 8 reflected from the interface between the end face of the quartz glass capillary tube and the high borosilicate glass and the optical signal 9 reflected from the interface between the high borosilicate glass and the active layer will change; the interference signal generated by the optical signal 9 reflected from the interface between the high borosilicate glass 3 and the active layer 4 and the optical signal 10 reflected from the surface of the active layer will change; so, the total change of the light signal 9 reflected from the interface of the high borosilicate glass 3 and the active layer 4 and the total change of the light signal 10 reflected from the surface of the active layer can eliminate the error caused by temperature in the process of detecting the concentration of heavy metal ions according to the interference signal change of the optical signals 8 and 9 reflected from the interface.
As shown in Fig. 3, a heavy metal ion sensor 14 is put in a container 13 storing heavy metal ion solution, the optical signal from the light source 11 reaches the heavy metal ion sensor 14 through the optical fiber coupler 12 and optical fiber, and the heavy metal ion sensor 14 obtains the reflected interference signal generated by the content of heavy metal ions and sends it through the opticai fiber coupler 12 and the optical fiber to the signal demodulation and output display device 15 for demodulation and output display.
In the present invention, using the advantages of optical fiber interference and modified polymer compounds to adsorb heavy metal ions will lead to slight changes in refractive index and thickness, resulting in the change of interference fringe. Based on the high-resolution demodulation algorithm, the concentration of heavy metal ions in the environment can be quickly, conveniently and sensitively measured, and the pollution of heavy metal in the environment or food can be effectively evaluated. Meanwhile, as the change of ambient temperature may cause thickness change of high borosilicate glass, as well as the thickness change of the active layer, the change information of interference fringe caused by the thickness change of high borosilicate glass can be used for eliminating the change of interference fringe caused by the change of ambient temperature in the active layer, so as to improve the measurement accuracy of heavy metal ions.
In the description of the present invention, it needs to understand that the terms "vertical", "horizontal", "up", "down", "before", "after", "left", "right" and "upright", "level", "top", "bottom", "inside" and "outside" indicate a location or position relationship based on the drawings, they only facilitate the description of the present invention, rather than indicating or implying that the device or component referred to must have a particular orientation, or must be constructed and operated in a particular orientation and shall not be construed as restrictions to the present invention.
The above embodiments only describe the preferred mode of the present invention and do not limit the scope of the present invention. Without deviating from the design spirit of the present invention, all variations and improvements formed by ordinary technicians in this field to the technical solution of the present invention shall fail into the scope of protection specified in the Claims of the present invention.
Claims (6)
1. An optical fiber heavy metal ion sensor based on Fabry-Perot interferometer, comprising a single-mode optical fiber, a quartz glass capillary tube, a high borosilicate glass and an active layer, the single-mode optical fiber is inserted into the quartz glass capillary tube, one end of the single-mode optical fiber extends out of one end of the quartz glass capillary tube, and the other end of the quartz glass capillary tube is fixedly connected with one end of the high borosilicate glass; and the other end of the high borosilicate glass is fixedly connected with one end of the active layer.
2. The optical fiber heavy metal ion sensor based on Fabry-Perot interferometer according to Claim 1, wherein the quartz glass capillary tube has an inner diameter of 126-128 microns and an outer diameter of 1-2.5 mm: and the thickness of the high borosilicate glass is 100-500 microns.
3. The optical fiber heavy metal ion sensor based on Fabry-Perot interferometer according to Claim 1, wherein the end face of the quartz glass capillary tube in contact with the high borosilicate glass and the end face of the single-mode optical fiber in contact with the high borosilicate glass shall have a finish of Grade 12 or above.
4. The optical fiber heavy metal ion sensor based on Fabry-Perot interferometer according to Claim 1, wherein the single-mode optical fiber and the quartz glass capillary tube are fixedly connected by an epoxy adhesive.
5. A method for preparing the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer according to one of Claims 1-4, comprising the following steps:
(1) preparing the single-mode optical fiber, coating the circumferential surface of the single-mode optical fiber with epoxy resin optical adhesive and inserting it into a through-hole of the quartz glass capillary tube to form a flat whole, placing it at the temperature of 80-150°C for 1-15 minutes, and then polishing the flat side end faces of both the single-mode optical fiber and the quartz glass capillary tube to a finish of Grade 12 or above;
(2) processing the high borosilicate glass with a diameter of 1-2.5 mm to a thickness of 100-500 microns, and then polishing one end face to a finish of Grade 12 and the other end face to a finish of Grade 8-9;
(3) placing the quartz glass capillary tube prepared in Step (1) and fixedly equipped with the single-mode optical fiber and the high borosilicate glass polished in Step (2) in alcohol solution for cleaning by ultrasonic wave for 3-10 minutes;
(4) fixing the polished surface of the quartz glass capillary tube with the single-mode fiber inserted into the through-hole and the side end face of the polished high borosilicate glass by the optical glue method; and
(5) preparing the active layer, forming it on the other end face of the high borosilicate glass by the self-assembly method, and the end surface of the exposed side of the active layer shall be smooth enough to reflect a certain amount of light power.
6. The method for preparing the optical fiber heavy metal ion sensor based on Fabry-Perot interferometer according to Claim 5, wherein the active layer in Step (5) is made from modified quaternary ammonium salt chitosan.
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| CN202010184445.5A CN111208088A (en) | 2020-03-17 | 2020-03-17 | Optical fiber heavy ion sensor based on Fabry-Perot interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486019A (en) * | 2022-01-12 | 2022-05-13 | 西北工业大学 | Optical fiber Fabry-Perot pressure sensor for eliminating third-cavity interference and MEMS manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111208088A (en) * | 2020-03-17 | 2020-05-29 | 广东海洋大学 | Optical fiber heavy ion sensor based on Fabry-Perot interference |
| CN115164954A (en) * | 2022-07-04 | 2022-10-11 | 中国人民解放军国防科技大学 | Preparation method of two-dimensional material Fabry-Perot type point-mode optical fiber sensor |
| CN117606641B (en) * | 2023-11-30 | 2024-04-30 | 哈尔滨工程大学 | Optical fiber interference type sensor based on germanium wafer and manufacturing method thereof |
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| CN101776595B (en) * | 2010-01-29 | 2012-02-08 | 武汉理工大学 | Manufacture method of optical fiber humidity sensor based on Fabry-Perot interference |
| US10359316B1 (en) * | 2016-06-08 | 2019-07-23 | Nutech Ventures, Inc. | Fiber optic bolometer |
| CN107703106B (en) * | 2017-11-17 | 2020-04-28 | 广东海洋大学 | Optical fiber sensor for simultaneously detecting temperature and heavy metal ions and manufacturing method thereof |
| CN109580546B (en) * | 2018-12-19 | 2021-07-20 | 天津大学 | Measuring method realized by using optical fiber Fabry-Perot gas refractive index and temperature sensing system |
| CN109540841B (en) * | 2018-12-20 | 2021-10-15 | 暨南大学 | Optical fiber Fabry-Perot hydrogen sensor, manufacturing method and detection method thereof |
| CN211825683U (en) * | 2020-03-17 | 2020-10-30 | 广东海洋大学 | Optical fiber heavy metal ion sensor based on Fabry-Perot interference |
| CN111208088A (en) * | 2020-03-17 | 2020-05-29 | 广东海洋大学 | Optical fiber heavy ion sensor based on Fabry-Perot interference |
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- 2020-03-17 CN CN202010184445.5A patent/CN111208088A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486019A (en) * | 2022-01-12 | 2022-05-13 | 西北工业大学 | Optical fiber Fabry-Perot pressure sensor for eliminating third-cavity interference and MEMS manufacturing method |
| 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 |
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| CN111208088A (en) | 2020-05-29 |
| WO2021184675A1 (en) | 2021-09-23 |
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