CN205262638U - A two core photonic crystal optical fiber sensor for being directed at temperature and simultaneous measurement of meeting an emergency - Google Patents
A two core photonic crystal optical fiber sensor for being directed at temperature and simultaneous measurement of meeting an emergency Download PDFInfo
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- CN205262638U CN205262638U CN201521019120.2U CN201521019120U CN205262638U CN 205262638 U CN205262638 U CN 205262638U CN 201521019120 U CN201521019120 U CN 201521019120U CN 205262638 U CN205262638 U CN 205262638U
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Abstract
The utility model discloses a two core photonic crystal optical fiber sensor for being directed at temperature and simultaneous measurement of meeting an emergency, including popping one's head in and connecting the single mode fiber in these probe both sides, should pop one's head in is two core photonic crystal optic fibre of symmetric distribution for the fibre core, and the index -matching fluid is filled in the air hole around one of them fibre core. The utility model discloses a sensor has integrateed and has detected two sets of mechanism in the spectrum, can make different responses to a plurality of physical quantitys, through corresponding demodulation method, then can calculate the singly change volume of a parameter.
Description
Technical field
The utility model relates to Fibre Optical Sensor, relates in particular to a kind of for temperature and strain are measured simultaneouslyDouble-core photonic crystal fiber sensor.
Background technology
The scope that fibre optic temperature sensor and strain transducer relate to is very extensive, is included in building healthCondition monitoring, industrial environment monitoring aspect have more application. Current temperature and strain transducer haveA variety of, comprise Fiber Bragg Grating FBG, long-period fiber grating etc. The two be all utilize temperature orThe impact of person's strain on fiber optic materials, thus the drift of grating resonance peak caused, carry out the variation to physical quantityMeasure. Above detection mode, due to device spectrum be generally unimodal, therefore when temperature and strainWhen device being exerted one's influence, can produce intersection sensing simultaneously, now cannot be judged by the drift value of spectrumThe variation of each physical quantity. When a physical quantity of this external independent measurement, the perturbation of another one physical quantityAlso can cause error to measurement, affect the certainty of measurement of sensor. For this situation, generally need to adoptError compensation processing is carried out in the measure of getting, and has increased complexity and the cost of system.
Along with the increase of every profession and trade to sensor measuring demand, and the continuous variation of Application in Sensing environment, industryThe performance requirement of bound pair sensor improves gradually. The one-tenth such as the certainty of measurement of sensor, resolution ratio, sensitivityFor important technical indicator. Traditional optical fibre device based on single quartz material, is limited to its material lowWarm light characteristic and play light characteristic, on sensing sensitivity, be difficult to obtain comparatively ideal index.
Utility model content
The technical problems to be solved in the utility model be in prior art when temperature and strain simultaneously rightWhen device is exerted one's influence, can intersect sensing, easily produce the defect of multi-parameter cross sensitivity, carryFor a kind of solve multi-parameter cross sensitivity problem for to temperature and the simultaneously-measured twin-core photon of strainCrystal optical fibre sensor.
The utility model solves the technical scheme that its technical problem adopts:
Provide a kind of for to temperature and the simultaneously-measured double-core photonic crystal fiber sensor of strain, comprisePop one's head in and be connected to the single-mode fiber of these probe both sides, this probe is the twin-core light that fibre core is symmetricPhotonic crystal fiber, wherein index-matching fluid is filled in a fibre core ambient air hole.
Described in the utility model for to temperature and the simultaneously-measured double-core photonic crystal fiber sensing of strainIn device, the airport array that the cross section of this double-core photonic crystal fiber is periodic distribution, this twin-core lightTwo symmetrical airports of the Centromedian both sides of photonic crystal fiber are removed, and form two silica core.
Described in the utility model for to temperature and the simultaneously-measured double-core photonic crystal fiber sensing of strainIn device, in the airport array of this double-core photonic crystal fiber, airport diameter is 3 μ m, between airportDistance is 4 μ m.
The beneficial effect that the utility model produces is: the utility model is using double-core photonic crystal fiber as biographyThe probe of sensor, and index-matching fluid is filled in the inside of one of them fibre core, thus can realize oneIn the integrated detection spectrum of individual probe two cover mechanism, can make different responses to multiple physical quantitys, passes throughCorresponding demodulation method, can calculate the variable quantity of single parameter. This sensor is in complicated physical ringsUnder border, can obtain good application performance, can solve the multi-parameter running in actual production environment and hand overFork sensitive issue.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is double-core photonic crystal fiber in the utility model embodiment double-core photonic crystal fiber sensorCross sectional representation;
Fig. 2 is the structural representation of the utility model embodiment double-core photonic crystal fiber sensor.
Fig. 3 is the spectrogram of the sensor of the utility model embodiment;
Fig. 4 a is the TEMP response diagram of the utility model embodiment;
Fig. 4 b is the sensing response figure of the strain of the utility model embodiment.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with attachedFigure and embodiment, be further elaborated to the utility model. Should be appreciated that described hereinSpecific embodiment is only in order to explain the utility model, and is not used in restriction the utility model.
Fig. 1 is the cross sectional representation of sensor double-core photonic crystal fiber used, and Fig. 2 is whole biographyThe structural representation of sensor. The utility model embodiment is used for temperature and the simultaneously-measured twin-core light of strainPhotonic crystal fiber sensor, comprises probe 10 and is connected to the single-mode fiber 20 of these probe 10 both sides,The double-core photonic crystal fiber that this probe 10 is symmetric for fibre core, wherein a fibre core surrounding air holeThe 11 inner index-matching fluids of filling. In another root fibre core surrounding air hole 12, do not fill.
In an embodiment of the present utility model, the double-core photonic crystal fiber cross section adopting is the cycleProperty distribute airport array, airport diameter is 3 μ m, airport spacing is 4 μ m. Optical fiber centreTwo symmetrical airports of both sides be removed, form two silica core. Single-mode fiber used is markQuasi-monomode fiber, surrounding layer diameter 125 μ m, core diameter 8 μ m.
The utility model embodiment is used for temperature and the simultaneously-measured double-core photonic crystal fiber sensing of strainThe manufacturing process of device is:
One, double-core photonic crystal fiber pretreatment. Choose one section of double-core photonic crystal fiber, use bladeGet rid of the armor coated of optical fiber, and with alcohol wipe optical fiber surface to remove coat residue. MakeBy smooth an end-grain cutting of optical fiber, then cutting out other one from this end face one segment distance place with optical fiber cutterIndividual smooth end face, concrete distance is decided according to the actual requirements.
Two, the selective filling of double-core photonic crystal fiber. Optical fiber one end of above-mentioned processing is placed onMicro-Microscopic observation, uses an other single-mode fiber to dip a small amount of colloid, at the end face of twin-core fiber,The airport of one side of one of fibre core is sealed. By the time, after colloid solidifies, the other end of this fibre core is soakedNot in index-matching fluid, owing to being subject to capillarity, index-matching fluid can be drawn onto the sky of optical fiberIn pore, thereby realize the filling of optical fiber, soak time can realize good filling in 2 minutesEffect.
Three and the welding of general single mode fiber. The double-core photonic crystal fiber of filling finally needs and is singleMode fiber has been welding together the making of whole device. Welding is used the manual operation function of optical fiber splicerComplete. During due to single-mode fiber and double-core photonic crystal fiber welding, to avoid a large amount of steamings of filling liquidSend out, and the subsiding etc. of airport, need to adopt the splicing parameter of having optimized. Splicing parameter is set to putElectric strength 20 units, discharge time, 700ms, ensured that double-core photonic crystal fiber airport do not collapse. WillThe double-core photonic crystal fiber two ends of filling all complete sensor by single-mode fiber in above-mentioned requirements weldingMaking, as shown in Figure 2.
Sensor of the present utility model can be used for measuring temperature and dependent variable. By the single-mode optics at sensor two endsFibre connects respectively light source (ALS-1550-20) and spectrometer (YokogawaAQ6370B) will obtain Fig. 3Spectrum. When Fibre Optical Sensor is used for to temperature survey, only need be by the double-core photonic crystal fiber of filling (Probe) the whole environment inside that is placed in transformation temperature, by the drift of spectrum of monitoring device. WithSample, in the time of the variation of monitor strain amount, is fixed on the two ends of filling optical fiber (i.e. probe) to apply and answersThe stress point becoming, and to this section of optical fiber stress application, obtain dependent variable by the drift of observation spectrum largeLittle.
Owing to comprising two groups of interference fringes in spectrum, and these two groups of stripeds are distinguished corresponding different temperature and answerBecome response characteristic. Fig. 4 a and Fig. 4 b are the temperature that the interference fringe of large minor cycle in spectrum obtains in experimentDegree and strain sensitivity. The temperature control of the large envelope interference fringe in spectrum is 5.42nm/ DEG C, strainSensitivity is-1.49pm/ μ ε. By contrast, the temperature control of minor cycle is 0.283nm/ DEG C, strainSensitivity is-1.55pm/ μ ε. Because its temperature and strain sensing response be all linearity, therefore, when by thisAfter the sensing response characteristic of two groups of stripeds records respectively, can adopt matrix demodulation method, to temperature andDependent variable is carried out measurement simultaneously. That is to say, in the time that temperature and strain affect sensor simultaneously, canBy the wavelength shift of two groups of interference fringes in measure spectrum, be brought into following formula, just can be simultaneouslyObtain the variable quantity of temperature and stress.
Should be understood that, for those of ordinary skills, can be changed according to the above descriptionEnter or convert, and all these improvement and conversion all should belong to the protection of the utility model claimsScope.
Claims (3)
1. one kind for to temperature and the simultaneously-measured double-core photonic crystal fiber sensor of strain, it is characterized in that, comprise probe and be connected to the single-mode fiber of these probe both sides, this probe is the double-core photonic crystal fiber that fibre core is symmetric, and wherein index-matching fluid is filled in a fibre core ambient air hole.
2. according to claim 1 for to temperature and the simultaneously-measured double-core photonic crystal fiber sensor of strain, it is characterized in that, the cross section of this double-core photonic crystal fiber is the airport array of periodic distribution, two symmetrical airports of these Centromedian both sides of double-core photonic crystal fiber are removed, and form two silica core.
3. according to claim 1ly it is characterized in that for to temperature and the simultaneously-measured double-core photonic crystal fiber sensor of strain, in the airport array of this double-core photonic crystal fiber, airport diameter is 3mm, and airport spacing is 4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521019120.2U CN205262638U (en) | 2015-12-10 | 2015-12-10 | A two core photonic crystal optical fiber sensor for being directed at temperature and simultaneous measurement of meeting an emergency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521019120.2U CN205262638U (en) | 2015-12-10 | 2015-12-10 | A two core photonic crystal optical fiber sensor for being directed at temperature and simultaneous measurement of meeting an emergency |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482808A (en) * | 2016-09-12 | 2017-03-08 | 武汉工程大学 | A kind of liquid level sensor based on quartzy glass capillary and preparation method |
| CN106644154A (en) * | 2016-09-12 | 2017-05-10 | 武汉工程大学 | Capillary structure-based optical fiber high-temperature sensor and preparation method thereof |
| CN107270949A (en) * | 2017-06-22 | 2017-10-20 | 武汉理工大学 | Temperature and strain dual sampling system and its measuring method |
| CN109596206A (en) * | 2019-01-25 | 2019-04-09 | 武汉理工大学 | Vibrating sensor based on liquid filling photonic crystal fiber |
| CN109990727A (en) * | 2019-05-21 | 2019-07-09 | 中国计量大学 | It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer |
| CN110260920A (en) * | 2019-06-26 | 2019-09-20 | 哈尔滨工程大学 | Temperature and refractive index dual sampling device based on directional coupler and long-period fiber grating |
| CN112285060A (en) * | 2020-10-23 | 2021-01-29 | 天津理工大学 | Double-core microstructure optical fiber intermode interference type high-sensitivity refractive index sensor |
-
2015
- 2015-12-10 CN CN201521019120.2U patent/CN205262638U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482808A (en) * | 2016-09-12 | 2017-03-08 | 武汉工程大学 | A kind of liquid level sensor based on quartzy glass capillary and preparation method |
| CN106644154A (en) * | 2016-09-12 | 2017-05-10 | 武汉工程大学 | Capillary structure-based optical fiber high-temperature sensor and preparation method thereof |
| CN107270949A (en) * | 2017-06-22 | 2017-10-20 | 武汉理工大学 | Temperature and strain dual sampling system and its measuring method |
| CN107270949B (en) * | 2017-06-22 | 2020-06-19 | 武汉理工大学 | Temperature and strain dual-parameter sensing system and measuring method thereof |
| CN109596206A (en) * | 2019-01-25 | 2019-04-09 | 武汉理工大学 | Vibrating sensor based on liquid filling photonic crystal fiber |
| CN109990727A (en) * | 2019-05-21 | 2019-07-09 | 中国计量大学 | It is a kind of based on twin-core fiber-photonic crystals optical fiber structure strain transducer |
| CN110260920A (en) * | 2019-06-26 | 2019-09-20 | 哈尔滨工程大学 | Temperature and refractive index dual sampling device based on directional coupler and long-period fiber grating |
| CN112285060A (en) * | 2020-10-23 | 2021-01-29 | 天津理工大学 | Double-core microstructure optical fiber intermode interference type high-sensitivity refractive index sensor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160525 Termination date: 20181210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |