CN105466808A - Liquid refractive index optical fiber sensor based on image analysis and surface plasma resonance - Google Patents
Liquid refractive index optical fiber sensor based on image analysis and surface plasma resonance Download PDFInfo
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- CN105466808A CN105466808A CN201610031029.5A CN201610031029A CN105466808A CN 105466808 A CN105466808 A CN 105466808A CN 201610031029 A CN201610031029 A CN 201610031029A CN 105466808 A CN105466808 A CN 105466808A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
Abstract
Provided is a liquid refractive index optical fiber sensor based on image analysis and surface plasma resonance. The liquid refractive index optical fiber sensor is characterized by being composed of a first single-mode optical fiber, an SPR sensor, a liquid tank, a liquid tank cover, a second single-mode optical fiber, an optical switch, a third single-mode optical fiber, an LED light source, a CCD camera, a reflecting grating, a beam expander, an image storage hard disk, a data connecting line and a computer, wherein the first single-mode optical fiber and the second single-mode optical fiber are connected to the two ends of the SPR sensor respectively, the other port of the first single-mode optical fiber is connected to the beam expander, emergent light of the beam expander can be perpendicularly irradiated to the reflecting grating, the reflecting grating is installed in front of the CCD camera, the other port of the second single-mode optical fiber and one end of the third single-mode optical fiber are connected to the two sides of the optical switch respectively, the other end of the third single-mode optical fiber is connected with the LED light source, and the image storage hard disk is connected with the computer through the data connecting line. The liquid refractive index optical fiber sensor is high in sensitivity, convenient to use, low in cost and capable of being applied to detecting various environmental indexes and physical health parameters.
Description
Technical field
Based on a liquid refractivity Fibre Optical Sensor for graphical analysis and surface plasma body resonant vibration, belong to technical field of optical fiber sensing.
Background technology
Along with the development of present measuring technique, Fibre Optical Sensor, compared with traditional electrical sensor, is not subject to electromagnetic interference (EMI) owing to having, highly sensitive, volume is little, lightweight, reusability strong, can imbed the advantages such as various structure and materials and be valued by the people gradually.In recent years, people have developed various Fibre Optical Sensor for the measurement to physical quantitys such as temperature, pressure, strains, in actual applications, the measurement of liquid solution concentration, composition also has considerable meaning, various based on surface plasma resonance optical fiber sensor also gradually propose by people.A kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration described in the present invention, its ultimate principle in variable concentrations solution, has different wavelength based on light after surface plasma resonance optical fiber, thus diffraction produces different spectrum.
Surface plasma body resonant vibration (SPR) is a kind of optical physics phenomenon.When Ray Of Light incides prism end face in certain angle, surface plasma-wave will be produced at the interface of prism and metallic film (Au or Ag).When surface plasma wave mates with incident ray propagation constant, under the excitation of light, cause free electron in metal film to produce resonance, i.e. surface plasma resonance, thus cause transmitted light wavelength variations, and the propagation of surface plasma wave is relevant with the refractive index of surrounding medium to a great extent, so surface plasma resonance sensor can be made into high precision refraction meter.The solution of variable concentrations has different refractive indexes, optical fiber will produce wavelength variations in various degree by the solution of variable concentrations, the light after have passed SPR Fibre Optical Sensor is allowed to pass through diffraction grating, the transmitted ray of different wave length will produce different spectrum, will respective change be there is in the rgb pixel point quantity in the image photographed by CCD camera like this, by demarcating LED light source light in advance by the rgb pixel point situation of change after various strength solution, just can make one for measuring the liquid refractivity based on computing machine use and the solution concentration Fibre Optical Sensor of solution concentration.
Summary of the invention
The object of the present invention is to provide a kind of liquid refractivity Fibre Optical Sensor utilizing graphical analysis and surface plasma body resonant vibration that can use on computers.This device can by realizing the Quick Measurement to solution concentration to the diffraction spectrum graphical analysis of the LED light source by being in the spr sensor in different solutions concentration.This device have structure simple, be easy to operation, detect the features such as quick.
The present invention is achieved through the following technical solutions:
Based on a liquid refractivity Fibre Optical Sensor for graphical analysis and surface plasma body resonant vibration, it is characterized in that: be made up of the first single-mode fiber (1), spr sensor (2), liquid tank (3), liquid tank lid (4), the second single-mode fiber (5), photoswitch (6), the 3rd single-mode fiber (7), LED light source (8), CCD camera (9), reflection grating (10), beam expander (11), image storage hard disk (12), data connecting line (13) and computing machine (14), the first single-mode fiber (1) and the second single-mode fiber (5) is connected respectively at the two ends of spr sensor (2), the another port of the first single-mode fiber (1) is connected to beam expander (11), the emergent ray of beam expander (11) can vertically be mapped in reflection grating (10), reflection grating (10) is arranged on CCD camera (9) front, the another port of the second single-mode fiber (5) and the 3rd single-mode fiber (7) one end are connected on the both sides of photoswitch (6) respectively, 3rd single-mode fiber (7) other end is connected with LED light source (8), spr sensor (2) is arranged in liquid tank (7), liquid tank lid (8) can Covering Liguid groove (7), first single-mode fiber (1), second single-mode fiber (5), photoswitch (6), 3rd single-mode fiber (7), LED light source (8), CCD camera (9), reflection grating (10), beam expander (11) is all embedded in image storage hard disk (12), liquid tank (3), liquid tank lid (4) is on image storage hard disk (12) surface, image storage hard disk (12) is connected with computing machine (14) data connecting line (13).
Described a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration, is characterized in that: the core diameter of the first single-mode fiber (1), spr sensor (2), the second single-mode fiber (5), the 3rd single-mode fiber (7) is 400 μm.
Described a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration, is characterized in that: the fibre core material of the first single-mode fiber (1), spr sensor (2), the second single-mode fiber (5) and the 3rd single-mode fiber (7) is PCS polymkeric substance.
Described a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration, it is characterized in that: the fiber lengths of spr sensor (2) is 10mm, and optical fiber surface is silver-plated, silver film thickness is 20-100nm.
Described a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration, is characterized in that: the grating constant of reflection grating (10) 0.67 μm ~ 0.83 μm.
Described a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration, it is characterized in that: reflection grating (10) surface Slygard184 silicon rubber is cured process, at room temperature leave standstill 48 hours after solidification, and then be connected with the first single-mode fiber (1).
Principle of work of the present invention is: LED light source (8) emits beam and is first coupled into the 3rd single-mode fiber (7), spr sensor (2) again through being immersed in solution to be measured after photoswitch (6) and the second single-mode fiber (5), the first single-mode fiber (1) is entered after light therethrough spr sensor (2), the emergent ray of the first single-mode fiber (1) can expand and make it vertical sand shooting and is irradiated in reflection grating (10) by beam expander (11), the diffraction spectrum image that reflection grating (10) produces will be taken by CCD camera (9), the diffraction image photographed is transferred to computing machine (13) just can obtain solution to be measured concentration by process.Surface plasma body resonant vibration (SPR) is a kind of optical physics phenomenon.When Ray Of Light incides prism end face in certain angle, surface plasma-wave will be produced at the interface of prism and metallic film (Au or Ag).When surface plasma wave mates with incident ray propagation constant, under the excitation of light, cause free electron in metal film to produce resonance, i.e. surface plasma resonance, thus cause transmitted light wavelength variations, and the propagation of surface plasma wave is relevant with the refractive index of surrounding medium to a great extent, so surface plasma resonance sensor can be made into high precision refraction meter.The solution of variable concentrations has different refractive indexes, optical fiber will produce wavelength variations in various degree by the solution of variable concentrations, the light after have passed SPR Fibre Optical Sensor is allowed to pass through diffraction grating, the transmitted ray of different wave length will produce different spectrum, will respective change be there is in the rgb pixel point quantity in the image photographed by CCD camera like this, by demarcating LED light source light in advance by the rgb pixel point situation of change after various strength solution, just can make one for measuring the liquid refractivity based on computing machine use and the solution concentration Fibre Optical Sensor of solution concentration.
The invention has the beneficial effects as follows: described a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration, described sensor integrative installation technology is on image transmitting hard disk, only data need be transmitted hard disk during use and be connected to computing machine, after uncap cleaning, solution instillation groove to be measured can be measured solution concentration, cover lid and dustproof and waterproof when not using, very easy to use, accuracy of detection is also very high.
Accompanying drawing explanation
Fig. 1 is a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration of the present invention;
Fig. 2 is the corresponding gray-scale intensity distribution curve of the diffraction spectrum that mobile phone camera of the present invention photographs;
Fig. 3 is the glycerin solution concentration that records of the present invention and respective indices of refraction relation.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
See accompanying drawing 1, based on a liquid refractivity Fibre Optical Sensor for graphical analysis and surface plasma body resonant vibration, it is characterized in that: be made up of the first single-mode fiber (1), spr sensor (2), liquid tank (3), liquid tank lid (4), the second single-mode fiber (5), photoswitch (6), the 3rd single-mode fiber (7), LED light source (8), CCD camera (9), reflection grating (10), beam expander (11), image storage hard disk (12), data connecting line (13) and computing machine (14), the first single-mode fiber (1) and the second single-mode fiber (5) is connected respectively at the two ends of spr sensor (2), the another port of the first single-mode fiber (1) is connected to beam expander (11), the emergent ray of beam expander (11) can vertically be mapped in reflection grating (10), reflection grating (10) is arranged on CCD camera (9) front, the another port of the second single-mode fiber (5) and the 3rd single-mode fiber (7) one end are connected on the both sides of photoswitch (6) respectively, 3rd single-mode fiber (7) other end is connected with LED light source (8), spr sensor (2) is arranged in liquid tank (7), liquid tank lid (8) can Covering Liguid groove (7), first single-mode fiber (1), second single-mode fiber (5), photoswitch (6), 3rd single-mode fiber (7), LED light source (8), CCD camera (9), reflection grating (10), beam expander (11) is all embedded in image storage hard disk (12), liquid tank (3), liquid tank lid (4) is on image storage hard disk (12) surface, image storage hard disk (12) is connected with computing machine (14) data connecting line (13).
LED light source (8) emits beam and is first coupled into the 3rd single-mode fiber (7), spr sensor (2) again through being immersed in solution to be measured after photoswitch (6) and the second single-mode fiber (5), the silver film thickness of spr sensor (2) is 50nm, the first single-mode fiber (1) is entered after light therethrough spr sensor (2), the emergent ray of the first single-mode fiber (1) can expand and make it vertical sand shooting and is irradiated to reflection grating (10) by beam expander (11), the grating constant of reflection grating (10) is that the diffraction spectrum image that 0.83 μm of reflection grating (10) produces will be taken by CCD camera (9), the diffraction image photographed is transferred to computing machine (13) just can obtain solution to be measured concentration by process.
Claims (6)
1., based on a liquid refractivity Fibre Optical Sensor for graphical analysis and surface plasma body resonant vibration, it is characterized in that: be made up of the first single-mode fiber (1), spr sensor (2), liquid tank (3), liquid tank lid (4), the second single-mode fiber (5), photoswitch (6), the 3rd single-mode fiber (7), LED light source (8), CCD camera (9), reflection grating (10), beam expander (11), image storage hard disk (12), data connecting line (13) and computing machine (14), the first single-mode fiber (1) and the second single-mode fiber (5) is connected respectively at the two ends of spr sensor (2), the another port of the first single-mode fiber (1) is connected to beam expander (11), the emergent ray of beam expander (11) can vertically be mapped in reflection grating (10), reflection grating (10) is arranged on CCD camera (9) front, the another port of the second single-mode fiber (5) and the 3rd single-mode fiber (7) one end are connected on the both sides of photoswitch (6) respectively, 3rd single-mode fiber (7) other end is connected with LED light source (8), spr sensor (2) is arranged in liquid tank (7), liquid tank lid (8) can Covering Liguid groove (7), first single-mode fiber (1), second single-mode fiber (5), photoswitch (6), 3rd single-mode fiber (7), LED light source (8), CCD camera (9), reflection grating (10), beam expander (11) is all embedded in image storage hard disk (12), liquid tank (3), liquid tank lid (4) is on image storage hard disk (12) surface, image storage hard disk (12) is connected with computing machine (14) data connecting line (13).
2. a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration according to claim 1, is characterized in that: the core diameter of the first single-mode fiber (1), spr sensor (2), the second single-mode fiber (5), the 3rd single-mode fiber (7) is 400 μm.
3. a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration according to claim 1, is characterized in that: the fibre core material of the first single-mode fiber (1), spr sensor (2), the second single-mode fiber (5) and the 3rd single-mode fiber (7) is PCS polymkeric substance.
4. a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration according to claim 1, it is characterized in that: the fiber lengths of spr sensor (2) is 10mm, optical fiber surface is silver-plated, and silver film thickness is 20-100nm.
5. a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration according to claim 1, is characterized in that: the grating constant of reflection grating (10) is 0.67 μm ~ 0.83 μm.
6. a kind of liquid refractivity Fibre Optical Sensor based on graphical analysis and surface plasma body resonant vibration according to claim 1, it is characterized in that: reflection grating (10) surface Slygard184 silicon rubber is cured process, at room temperature leave standstill 48 hours after solidification, and then be connected with the first single-mode fiber (1).
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| CN201610031029.5A CN105466808B (en) | 2016-01-13 | 2016-01-13 | A kind of liquid refractivity fibre optical sensor based on image analysis and surface plasma body resonant vibration |
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| CN201610031029.5A CN105466808B (en) | 2016-01-13 | 2016-01-13 | A kind of liquid refractivity fibre optical sensor based on image analysis and surface plasma body resonant vibration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442418A (en) * | 2016-09-06 | 2017-02-22 | 大连理工大学 | Low-cost spectroscopic imaging system based on surface plasma resonance |
| CN113341708A (en) * | 2021-05-14 | 2021-09-03 | 华中科技大学 | Method and system for measuring plasma parameters of femtosecond laser induced gas ionization |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002350335A (en) * | 2001-05-28 | 2002-12-04 | Tama Tlo Kk | Refractive index sensor, sensor system and optical fiber |
| CN104614345A (en) * | 2015-01-21 | 2015-05-13 | 大连理工大学 | Portable optical fiber SPR (Surface Plasma Resonance) image sensor |
| CN204789331U (en) * | 2015-07-24 | 2015-11-18 | 大连理工大学 | Optic fibre surface plasma resonance image sensor based on smart mobile phone monitoring platform |
| CN205483905U (en) * | 2016-01-13 | 2016-08-17 | 中国计量学院 | Liquid refracting index optical fiber sensor based on image analysis and resonance of surperficial plasma |
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2016
- 2016-01-13 CN CN201610031029.5A patent/CN105466808B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002350335A (en) * | 2001-05-28 | 2002-12-04 | Tama Tlo Kk | Refractive index sensor, sensor system and optical fiber |
| CN104614345A (en) * | 2015-01-21 | 2015-05-13 | 大连理工大学 | Portable optical fiber SPR (Surface Plasma Resonance) image sensor |
| CN204789331U (en) * | 2015-07-24 | 2015-11-18 | 大连理工大学 | Optic fibre surface plasma resonance image sensor based on smart mobile phone monitoring platform |
| CN205483905U (en) * | 2016-01-13 | 2016-08-17 | 中国计量学院 | Liquid refracting index optical fiber sensor based on image analysis and resonance of surperficial plasma |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442418A (en) * | 2016-09-06 | 2017-02-22 | 大连理工大学 | Low-cost spectroscopic imaging system based on surface plasma resonance |
| CN113341708A (en) * | 2021-05-14 | 2021-09-03 | 华中科技大学 | Method and system for measuring plasma parameters of femtosecond laser induced gas ionization |
| CN113341708B (en) * | 2021-05-14 | 2022-05-20 | 华中科技大学 | Method and system for measuring plasma parameters of femtosecond laser induced gas ionization |
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| CN105466808B (en) | 2018-08-03 |
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