CN1194217C - Longitudianl distributive surface plasma wave sensors - Google Patents
Longitudianl distributive surface plasma wave sensors Download PDFInfo
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- CN1194217C CN1194217C CN 03113077 CN03113077A CN1194217C CN 1194217 C CN1194217 C CN 1194217C CN 03113077 CN03113077 CN 03113077 CN 03113077 A CN03113077 A CN 03113077A CN 1194217 C CN1194217 C CN 1194217C
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Abstract
The present invention discloses a longitudinal distributed surface plasma wave sensor. The longitudinal distributed surface plasma wave sensor is composed of an interface and a sensing element, wherein the sensing element is composed of reflecting layers, sensing layers and an optical fiber, the reflecting layers and the sensing layer are alternately coated on the peripheral surface of the optical fiber, and the refractivity of each reflecting layer is larger than that of the optical fiber. The sensing layers of the present invention can be coated on the peripheral surface of the optical fiber; therefore, the sensing layers can be extended in an axial direction of the optical fiber, the sensing region can be enlarged, and the sensitivity can be enhanced; compared with the conical sensing layers of the prior art, the sensing layering which are coated on the peripheral surface of the optical fiber have the advantage of convenient processing.
Description
One, technical field
The present invention relates to the sensor that a kind of gas, fluid characteristics parameter testing are used, relate in particular to a kind of vertical distributed surface plasma wave sensor.
Two, background technology
1993, doctor R.C.Gorgenson of Washington, DC university has at first proposed the notion of optical fiber surface plasmon resonance sensors and has designed optical fiber surface plasmon resonance sensors, and to general theory, the characteristic of this sensor be used as certain research.The countries in the world scholar has done further research and discussion to this kind sensor subsequently.In 1997, the application of German's Mattias labor the patent of optical fiber surface plasmon resonance sensors.The purpose of this invention is to have proposed a kind of optical fiber surface plasmon resonance sensors, and this sensor has suitable energy, and is suitable for using multimode fibre, thereby has eliminated owing to harmful resonant transmission of selecting for use multiple different pattern to cause.By means of the method for excitating surface plasma with the refraction coefficient of measuring various different mediums, and for realizing that its part surface that this method adopted has surface plasma wave and excites coating or similar coating system, and to have an angle of inclination be β's and reach the purpose of measuring the different medium refraction coefficient with the device on the adjacent surface of above-mentioned part surface.The end of sensing head is the triangle that certain angle is arranged in this invention, and main sensitive zones only only limits to the end of sensing head.Have several defectives: 1. sensitive zones is little, thereby sensitivity is lower.2. the plated film of sensor processing and difficult, progress is wayward.3. has only a sensing head in a system.If when realizing the gas of certain limit or distribution of liquid tested, need a plurality of systems, thereby cost is very big, the consistance of test result is relatively poor.For this reason, we have proposed the notion of vertical distribution type fiber-optic surface plasma wave sensor, and have designed vertical distribution type fiber-optic surface plasma wave sensor.Thereby realized adopting real-time realization that a cover analytic system can be continuous test to the distribution character of liquid or gas.This system architecture is simple, with low cost, technology is reliable.Owing to adopt spectrographic method, thus to light source require relatively low.
Three, technology contents
Goal of the invention: the invention provides a kind of vertical distributed surface plasma wave sensor of being convenient to process and help the raising of sensitivity, it can be gathered the distribution character of measurand and make test macro have advantage of simple structure, helps the conforming raising of system testing result.
Technical scheme: the present invention is a kind of vertical distributed surface plasma wave sensor, form by interface and sensing element, sensing element is made up of reflection horizon, sensing layer and optical fibers, reflection horizon and sensing layer alternately are overlying on the fiber-optic outer peripheral face, and the reflection horizon is the reflection horizon of this layer refractive index greater than the optical fibers refractive index.
Technique effect: 1. since sensing layer of the present invention can be coated on the fiber-optic outer peripheral face, so sensing layer can extend axially along optical fibers, thereby can realize the expansion of sensitive zones, raising sensitivity.2. be coated on the optical fibers periphery and the sensing layer of face with respect to the conical sensing layer of prior art, have the advantage of being convenient to process.3. because sensing layer of the present invention can be positioned at fiber-optic different axial location, therefore, the present invention can gather the signal of measurand distribution character, moreover the present invention can only make up with a cover detecting and analysing system, realize the test of the distribution character of measurand, thereby can improve test system and test result's consistance, have simple in structure, cost is low and the reliable advantage of technology.4. the technical measures of catoptron make the present invention have the light coupling and are easy to advantage.5. the technical measures of modulating layer, the vertical distributed sensing of easier realization.
Four, description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is an A-A structure cut-open view of the present invention.
Five, embodiment
The present invention is a kind of vertical distributed surface plasma wave sensor, form by interface 1 and sensing element, sensing element is made up of reflection horizon 2, sensing layer 3 and optical fibers 4, reflection horizon 2 and sensing layer 3 alternately are overlying on the outer peripheral face of optical fibers 4, reflection horizon 2 is the reflection horizon of this layer refractive index greater than the optical fibers refractive index, for example: gold layer, silver layer, copper layer or aluminium lamination etc., the sensing layer that is positioned at diverse location both can adopt the metal level of unlike material, also can adopt the metal level of identical material.In the present embodiment, optical fibers 4 adopts fiber cores, and reflection horizon 2 is a ferrule, end at optical fibers 4 is provided with catoptron, and sensing layer 3 is cylindricality, is provided with modulating layer 5 on sensing layer 3, this modulating layer 5 both can be a zirconia layer, also can be tantalum oxide layers.
Making that the present invention has adopted following method:
1, selects optical fiber according to the fiber core refractive index of optical fiber, the core diameter of optical fiber and the material of optical fiber.The size of fiber core refractive index directly has influence on the measurement range of sensor, so the fiber core refractive index of suitable selection optical fiber is very important.Because the constraint of the purposes of made Fibre Optical Sensor might claim to the size of sensor, promptly to the size requirement to some extent of fiber core, determines the structure that influences measurand that suitable core size can be less.For any sensor, always wish that it has the higher life-span.Material to fibre core claims like this, requires it that intensity and toughness are preferably arranged.Mainly having adopted fiber core refractive index in the middle of the experiment is 1.49 silica fibre.
2, after optical fiber is selected, will further process optical fiber, processing sections is the end and the middle plurality of sections section of optical fiber.
Determine the probe length of the exposed length-optical fiber surface plasmon resonance sensors of each section fiber core.Different length will exert an influence to the sensitivity of optical fiber surface plasmon resonance sensors.Because determine that by theoretical model the optimization length of sensor probe is very difficult, so adopt the method for experiment to determine optimization length usually.
3, corrode the coat and the covering of optical fiber with sulfuric acid, polish the end face of fibre-optical probe simultaneously, and polish.
4, the selection of sensing layer kind.The sensing layer that can be used for surface plasma wave sensor has materials such as gold, silver, copper, aluminium.Usually adopt gold or silver-colored.If require the long-time stability of sensor to get well, should adopt gold.But the price of gold is relatively costly.
5, final step is carried out plated film to ready optical fiber.Because design is vertical distribution type fiber-optic surface plasma wave sensor, so the suitable sensing layer thickness of determining each section will be the key that successfully designs vertical distribution type fiber-optic surface plasma wave sensor.Corresponding to different sensing layer thickness, optical fiber surface plasmon resonance sensors will have different resonant wavelengths.This characteristic is the fundamental basis of the vertical distribution type fiber-optic surface plasma wave sensor of design.Usually determine the thickness of each section sensing layer with the method for experiment.
The present invention can be used for vertical vertically distribution type fiber-optic surface plasma wave sensor test macro and traditional optical fiber surface plasmon resonance sensors similar (for convenience, three sensitive zones that only draw below are example with three sensitive zones).Input signal remains white light source, because the resonant wavelength of each sensitive zones is different, so when this sensor is inserted in a certain suitable uniform medium, because at each sensitive zones surface plasma body resonant vibration has taken place, a plurality of different trench will appear, when this sensor is inserted in the detected object, measurand is not before changing, when measurand change inhomogeneous, then corresponding to the different position of measurand, the change information difference, then corresponding to the mobile difference of the sensitive zones resonant wavelength of zones of different, set up the resonant wavelength of each sensitive zones and the relation between the detected object inner parameter, then can realize adopting same set of test macro that detected object is realized that multiple spot detects and monitoring.In addition,, can make some sensitive zones do temperature compensation, make it insert in the unchanged detected object, in whole detection, not participate in detecting, only reflect the influence of environment temperature because plasma ripple resonance sensors such as surface are subjected to stable interference easily.Resonant wavelength changing value that like this can other sensitive zones deducts this temperature compensation zone resonant wavelength changing value, can realize temperature compensation and correction.
Claims (4)
1, a kind of vertical distributed surface plasma wave sensor, form by interface (1) and sensing element, it is characterized in that sensing element is made up of reflection horizon (2), sensing layer (3) and optical fibers (4), on sensing layer (3), be provided with modulating layer (5), reflection horizon (2) and sensing layer (3) and modulating layer (5) longitudinally alternately are overlying on the outer peripheral face of optical fibers (4), and reflection horizon (2) are the reflection horizon of this layer refractive index greater than the optical fibers refractive index.
2, vertical distributed surface plasma wave sensor according to claim 1 is characterized in that optical fibers (4) adopts fiber cores, and reflection horizon (2) are ferrule.
3, vertical distributed surface plasma wave sensor according to claim 1 and 2 is characterized in that being provided with catoptron in the end of optical fibers (4).
4, vertical distributed surface plasma wave sensor according to claim 3 is characterized in that sensing layer (3) is cylindricality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03113077 CN1194217C (en) | 2003-03-28 | 2003-03-28 | Longitudianl distributive surface plasma wave sensors |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03113077 CN1194217C (en) | 2003-03-28 | 2003-03-28 | Longitudianl distributive surface plasma wave sensors |
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| CN1439871A CN1439871A (en) | 2003-09-03 |
| CN1194217C true CN1194217C (en) | 2005-03-23 |
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| CN 03113077 Expired - Fee Related CN1194217C (en) | 2003-03-28 | 2003-03-28 | Longitudianl distributive surface plasma wave sensors |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100362337C (en) * | 2004-07-28 | 2008-01-16 | 南京航空航天大学 | Optical surface plasma wave nucleic acid sensor system for detecting mononucleotide polymorphism and detecting method |
| CN103335985B (en) * | 2013-07-10 | 2016-01-13 | 北京交通大学 | Quasi-distributed fiber grating surface plasma resonance sensor and preparation method |
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Owner name: CLP TECHNOLOGY YANGZHOU BAOJUN ELECTRONICS CO., L Free format text: FORMER OWNER: DONGNAN UNIV. Effective date: 20080613 |
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Effective date of registration: 20080613 Address after: No. 84 Jiefang North Road, Yangzhou Patentee after: Yangzhou Baojun Electronic Co., Ltd., Zhongdian Science & Technology Address before: No. four arch 2, Nanjing City, Jiangsu Province Patentee before: Southeast University |
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