CN201697728U - High-sensitivity temperature sensor based on partial perfusion type HiBi-PCF-FLM (high birefrigent photonic crystalfiber loop mirror) - Google Patents
High-sensitivity temperature sensor based on partial perfusion type HiBi-PCF-FLM (high birefrigent photonic crystalfiber loop mirror) Download PDFInfo
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- CN201697728U CN201697728U CN2010202117604U CN201020211760U CN201697728U CN 201697728 U CN201697728 U CN 201697728U CN 2010202117604 U CN2010202117604 U CN 2010202117604U CN 201020211760 U CN201020211760 U CN 201020211760U CN 201697728 U CN201697728 U CN 201697728U
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Abstract
The utility model relates to a high-sensitivity temperature sensor based on partial perfusion type HiBi-PCF-FLM (high birefrigent photonic crystalfiber loop mirror). With a compact structure, the utility model overcomes the defect that the general optical fiber temperature sensor has low temperature sensitivity. In the utility model, a temperature-sensitive solution is poured into a small air hole of a photon crystal optical fiber cladding to form a high birefrigent photonic crystalfiber. Two ends of the photonic crystal optical fiber are respectively connected with two ports on one side of an optical fiber coupler to form a fiber loop mirror structure; and two ports on the other side of the optical fiber coupler are respectively connected with a wideband light source and a wavelength measuring device. The light emitted by the wideband light source is split into two bundles of oppositely-transmitted light; the phase difference of two bundles of light is very sensitive to the change of the temperature; under the interference action of an output terminal of the optical fiber environment, the larger shift of an output spectrum of the optical fiber environment can be caused by the extremely-little change of the external environment temperature; and the temperature information can be demodulated by monitoring the shift of a certain loss peak in the output spectrum. The sensor has the advantages of small volume, simple structure and high temperature-measuring sensitivity; and the sensor can be widely applied to the field of high-sensitivity temperature monitoring.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, be specifically related to a kind of based on part perfusion type high double-refraction photon crystal fiber ring mirror (Highly Birefringent Photonic CrystalFiber Loop Mirror, high sensitivity temperature sensor HiBi-PCF-FLM).
Background technology
Temperature measured in our daily life be seen everywhere, thermometer is exactly wherein prevailing a kind of simple and easy temperature sensor.Along with the development of society and the progress of science and technology, some other temperature sensor such as thermopair, thermistor etc. based on electric signal have also progressed into people's sight, and are widely used in the every field of temperature detection.Their temperature-measurement principle and structure are all fairly simple, but since be with electric signal as the work media, be easy to be subjected to electromagnetic interference (EMI), and exist perishablely, sensitivity is lower, is difficult to realize shortcomings such as distributed sensing.
Fibre Optical Sensor has the advantage of many uniquenesses, and highly sensitive as insensitive to electromagnetic interference (EMI), volume is little, and is anticorrosive, can be applicable in the various environment.Varied with optical fiber as the mechanism of temperature survey media, and based on the temperature sensor of bragg grating or long period fiber grating with its better simply principle--adopt wavelength shift that temperature variation causes or Strength Changes to carry out demodulation and can obtain temperature information, and be subject to people's attention.Yet the remolding sensitivity of bragg grating temperature sensor lower (have only～10pm/ ℃) can't be applied to highly sensitive thermometric field; Therefore long period fiber-optical grating temperature sensor requires very high to measuring condition because its extreme susceptibility to bending is very easily introduced the interference that can't predict in the thermometric process.
Photonic crystal fiber is a kind of novel optical fiber, in its covering vertically periodic arrangement the airport of wavelength magnitude, have two-dimensional photon crystal structure.Flexible design by to size, distribution or the refractive index of these airports can realize different functions.The utility model be exactly in the part airport of photonic crystal fiber covering filling temperature responsive type solution realize temperature sensing.
Summary of the invention
The utility model purpose is exactly the not high characteristics of sensitivity that exist at the existing fiber temperature sensor, has proposed a kind of simple, compact, high sensitivity temperature sensor that the highly sensitive high double-refraction photon crystal fiber based on part perfusion type combines with fiber loop mirror.
The utility model is that the technical scheme that the technical solution problem is taked is:
A kind of high sensitivity temperature sensor based on part perfusion type HiBi-PCF-FLM comprises photonic crystal fiber, fiber coupler and responsive to temperature type solution.
In the airport of the long photonic crystal fiber covering of 5cm, pour into responsive to temperature type solution, thereby form the high birefringence effect, but concrete method for filling list of references: Y.Y.Huang, Y.Xu, Amnon Yariv, " Fabrication of functional microstructured optical fibersthrough a selective-filling technique; " Applied Physics Letters, Vol.85, No.22,2004.Fiber coupler two ports on one side are connected with the two ends of photonic crystal fiber behind the filling temperature responsive type solution respectively, and two ports of another side link to each other with the wavelength measurement device with wideband light source respectively.Photonic crystal fiber and fiber coupler are formed the fiber loop mirror structure.
The advantage that the utility model had is: the phase differential of the light that two bundles transmit in opposite directions in the fiber loop mirror is very responsive to temperature variation, under interference effect through the fiber loop mirror output terminal, the little change of ambient temperature just can cause the bigger drift of fiber loop mirror output spectra, drift value by a certain loss peak in the monitoring interference spectrum, just can demodulate temperature information, thereby improved the sensitivity of temperature sensing greatly, can reach 1.8nm/ ℃, exceed two orders of magnitude than the bragg grating temperature sensor; The photonic crystal fiber length that is used for transducing part only is 5cm, dwindles greatly than the temperature sensor of other fiber loop mirror structures, so this component compact, volume is little, can be widely used in all temps monitoring field.
Description of drawings
Fig. 1 is a structural drawing of the present utility model, and Fig. 2 is the end view behind the filling temperature responsive type in photonic crystal fiber and the little airport of covering thereof in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, a kind of high sensitivity temperature sensor based on part perfusion type HiBi-PCF-FLM comprises photonic crystal fiber 1, fiber coupler 2 and responsive to temperature type solution 3.Get the long photonic crystal fiber 1 of 5cm, in the little airport of this photonic crystal fiber covering, pour into responsive to temperature type solution 3, form high double-refraction photon crystal fiber; Its two ends are connected with fiber coupler 2 two ports on one side respectively, and two ports of fiber coupler another side are connected with the wavelength measurement device with wideband light source respectively.Photonic crystal fiber 1 is formed the fiber loop mirror structure with fiber coupler 2.Just can produce interference at its output port behind the light process fiber loop mirror of wideband light source, form a plurality of loss peaks, the polarization extinction ratio of loss peak can reach 20-30dB.
Working method of the present utility model is: fiber coupler will be divided into two light of restrainting transmission in opposite directions by the light that wideband light source sends and enter fiber loop mirror, propagate all backs by the output port ejaculation of fiber coupler from fiber loop mirror in fiber loop mirror.Because photonic crystal fiber can reach higher birefringence effect behind the filling temperature responsive type, therefore the light of two bundle reverse directions propagation can produce phase differential, and its value is:
Wherein: Δ n is the refringence of two light that transmit in opposite directions in the fiber loop mirror, and L is the length of photonic crystal fiber, and λ is an incident light wave length.In the utility model, Δ n can reach 5.7 * 10
-4, L is 5cm, λ is 1550 μ m.
Two-beam with phase differential can produce after the output terminal of fiber loop mirror meets interferes, and forms the interference spectum with a plurality of loss peaks, and the relation of interference spectum and phase differential is as follows:
When ambient temperature changes, can cause the solution refractive index generation minor alteration in the photonic crystal fiber aperture, then the refractive index difference that causes two light that transmit in opposite directions in the fiber loop mirror changes, the phase differential that promptly causes both changes, according to above-mentioned formula as can be known, interference spectum can drift about, and varies with temperature the drift value of generation by monitoring certain loss peak, just can demodulate temperature information.
The utility model can realize that the gordian technique of high sensitivity thermometric is: employed photonic crystal fiber can reach higher birefringence effect behind the filling temperature responsive type; The phase differential of the light of transmission is relatively responsive to temperature variation in opposite directions for two bundles in the fiber loop mirror, through the interference effect of fiber loop mirror output spectra, and the bigger drift that can bring loss peak, thereby the sensitivity when improving thermometric.
In the present embodiment, the diameter of two big airports is 4.5 μ m in its covering of the photonic crystal fiber of selecting for use, and the diameter of all the other little airports is 2.2 μ m, fiber lengths 5cm.Responsive to temperature type liquid is deionized water, and the refractive index under the room temperature is 1.333, and refractive index is 6.24 * 10 with the variation of temperature rate
-4/ ℃; Sensor temperature sensitivity reaches 1.8nm/ ℃.
Claims (4)
1. high sensitivity temperature sensor based on part perfusion type HiBi-PCF-FLM, comprise photonic crystal fiber (1), fiber coupler (2) and refraction index solution (3), it is characterized in that: the fiber coupler of this contrive equipment two ports on one side with pour into refraction index solution after the photonic crystal fiber two ends be connected, two ports of another side are connected with the wavelength measurement device with wideband light source respectively, and photonic crystal fiber and fiber coupler are formed the fiber loop mirror structure.
2. as right 1 described photonic crystal fiber, the diameter that it is characterized in that two big airports in the covering is 4.5 μ m, and the diameter of all the other little airports is 2.2 μ m, can reach higher birefringence effect after the perfusion refraction index solution in the little airport of covering.
3. as right 1 described fiber coupler, it is characterized in that its splitting ratio is 1: 1.
4. as right 1 described refraction index solution, it is characterized in that its refractive index is responsive to temperature, can be aqueous solution or liquid crystal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202117604U CN201697728U (en) | 2010-06-02 | 2010-06-02 | High-sensitivity temperature sensor based on partial perfusion type HiBi-PCF-FLM (high birefrigent photonic crystalfiber loop mirror) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202117604U CN201697728U (en) | 2010-06-02 | 2010-06-02 | High-sensitivity temperature sensor based on partial perfusion type HiBi-PCF-FLM (high birefrigent photonic crystalfiber loop mirror) |
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| CN201697728U true CN201697728U (en) | 2011-01-05 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852656A (en) * | 2010-06-02 | 2010-10-06 | 中国计量学院 | High-sensitivity temperature sensor and device based on partially-perfused HiBi-PCF-FLM (Highly Birefringent-Photonic Crystal Fiber-Fiber Loop Mirror) |
| CN102243113A (en) * | 2011-06-22 | 2011-11-16 | 天津大学 | Photonic crystal fiber grating temperature sensor with tunable wavelength |
| CN103698048A (en) * | 2013-12-09 | 2014-04-02 | 中国计量学院 | Simple high-sensitivity optical-fiber temperature sensor |
| CN104655590A (en) * | 2015-02-10 | 2015-05-27 | 天津大学 | All-fiber refractive index and temperature sensor and measuring method |
-
2010
- 2010-06-02 CN CN2010202117604U patent/CN201697728U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852656A (en) * | 2010-06-02 | 2010-10-06 | 中国计量学院 | High-sensitivity temperature sensor and device based on partially-perfused HiBi-PCF-FLM (Highly Birefringent-Photonic Crystal Fiber-Fiber Loop Mirror) |
| CN101852656B (en) * | 2010-06-02 | 2012-04-25 | 中国计量学院 | Temperature sensor based on partially-perfused HiBi-PCF-FLM (Highly Birefringent-Photonic Crystal Fiber-Fiber Loop Mirror) |
| CN102243113A (en) * | 2011-06-22 | 2011-11-16 | 天津大学 | Photonic crystal fiber grating temperature sensor with tunable wavelength |
| CN103698048A (en) * | 2013-12-09 | 2014-04-02 | 中国计量学院 | Simple high-sensitivity optical-fiber temperature sensor |
| CN104655590A (en) * | 2015-02-10 | 2015-05-27 | 天津大学 | All-fiber refractive index and temperature sensor and measuring method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20120602 |