CN102279169B - Refractive index sensor based on photonic crystal fiber - Google Patents
Refractive index sensor based on photonic crystal fiber Download PDFInfo
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- CN102279169B CN102279169B CN 201110182556 CN201110182556A CN102279169B CN 102279169 B CN102279169 B CN 102279169B CN 201110182556 CN201110182556 CN 201110182556 CN 201110182556 A CN201110182556 A CN 201110182556A CN 102279169 B CN102279169 B CN 102279169B
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Abstract
The invention relates to a refractive index sensor based on a photonic crystal fiber. One technical scheme of the invention comprises a light source, a single-mode fiber, the photonic crystal fiber and an image sensor. The other technical scheme of the invention comprises a broadband light source, the single-mode fiber, the photonic crystal fiber, a first 3dB fiber coupler, a second 3dB fiber coupler and a spectroscope. The photonic crystal fiber comprises a fiber core, at least one air hole layer and a wrapping layer; the interior of the fiber core is hollow; the at least one air hole layer is positioned in the wrapping layer; each air hole layer encircles the center of the fiber core; and the wrapping layer is made of silicon dioxide. By using a photonic crystal fiber refractive index sensing device with high sensing precision, the sensitivity of measurement for liquid with different refractive indexes is high; and the refractive index sensor can be particularly applied to micro measurement for liquid with high refractive index.
Description
Technical field
The invention belongs to the photon crystal optical fiber sensing technical field, relate to a kind of index sensor based on photonic crystal fiber.
Background technology
In recent years, along with the progress of science and technology, people more and more come high to the requirement of sensor, and Fibre Optical Sensor occupies an important position in scientific research and commercial Application with itself advantage always.
In traditional Fibre Optical Sensor is used, comprise long-period fiber grating sensor and Bragg optical-fiber grating sensor etc., because it has susceptibility to environment temperature, during the physical quantity sensings such as refractive index, cross influence is comparatively serious, will cause sensing accuracy undesirable.Simultaneously, the traditional fiber sensor can only be used for measuring refractive index less than the liquid of covering, will lose efficacy in to the measurement of high refractive index liquid.
Photonic crystal fiber (PCF) is a kind of novel optical fiber and possesses good optical characteristics, distributing in its covering periodic arrangement, along fiber axis to the airport that stretches, can design the PCF with various special natures by size, shape, the position distribution of flexible change airport.Photonic crystal fiber has good architectural characteristic and mode characteristic, can realize the sensing to physical quantitys such as temperature, stress, environment refractive index and bendings.Photonic Crystal Fiber Sensor is not only the same with the traditional fiber sensor, have that precision is high, sensing scope is large and the advantage such as anti-external interference, also have the insensitivity to environment temperature, and can be used for measuring the trace detection of high refractive index liquid and high sensing accuracy.Now realized multiple sensor based on photonic crystal fiber.But present report is all to realize the sensing of counter stress or temperature by the wavelength variations of using wideband light source and spectrometer to detect resonance crest (paddy).
In research in sum, existing sensing technology shorter mention has limited the range of application of Fibre Optical Sensor to the fields of measurement to high refractive index liquid.
Summary of the invention
The present invention is directed to the traditional fiber index sensor and high refractive index liquid is measured problems such as losing efficacy, expend testing liquid, a kind of photonic crystal fiber that can be used for the special construction of high refractive index liquid trace measurement is provided, and the index sensor based on this photonic crystal fiber further is provided.
The technical scheme that technical solution problem of the present invention is taked is:
The first technical scheme of the present invention: based on the index sensor of photonic crystal fiber, comprise light source, single-mode fiber, photonic crystal fiber and imageing sensor.The output terminal of light source is connected with an end light of single-mode fiber, and the other end of single-mode fiber is connected with an end light of photonic crystal fiber, and the other end of photonic crystal fiber is over against imageing sensor.
The second technical scheme of the present invention: based on the index sensor of photonic crystal fiber, comprise wideband light source, single-mode fiber, photonic crystal fiber, a 3dB fiber coupler, the 2nd 3dB fiber coupler and spectrometer.Wideband light source is connected with a port optical of 3dB fiber coupler one side, and two ports of a 3dB fiber coupler opposite side are connected with an end of photonic crystal fiber, an end light of single-mode fiber respectively; The other end of photonic crystal fiber, the other end of single-mode fiber are connected with two port opticals of the 2nd 3dB fiber coupler one side respectively, and a port of the 2nd 3dB fiber coupler opposite side is connected with spectrometer light.
Photonic crystal fiber described in above-mentioned two kinds of technical schemes comprises fibre core, airport layer and covering; Described fibre core inner hollow, the refractive index of fibre core are 1, and core diameter is 10 μ m; Described airport layer is arranged in covering and has one deck airport layer at least, every layer of air hole layer distributes around core centre, every layer of air hole layer is regular hexagon, described airport layer is comprised of a plurality of airports, the refractive index of each airport is 1, the diameter of airport is 10 μ m, and the pitch of holes of adjacent vacant pore is identical with the diameter of airport; Described clad material is silicon dioxide.
The minimum centers-distance of described fibre core and innermost layer airport layer hollow pore is 17.32 μ m, and the maximum distance between centers of described fibre core and innermost layer airport layer hollow pore is 20 μ m.
The beneficial effect that the present invention has is: utilize the high photon crystal optical fibre refractivity sensing device of sensing accuracy, make the present invention improve the sensitivity of different refractivity liquid measure, especially can be applied to the trace measurement to high refractive index liquid.Adopt visible light cmos image sensor-based system peak value display power to change, the cost of index sensor is reduced greatly; Adopt spectrometer detection peak wavelength to move, make measuring method simple, convenient, fast, greatly strengthened the practicality of sensor.
Description of drawings
Fig. 1 is photonic crystals optical fiber structure schematic diagram in the present invention.
Fig. 2 is the first embodiment of the invention structural representation.
Fig. 3 is the second embodiment of the invention structural representation.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 shows the structure of photonic crystal fiber in the present invention, comprises fibre core 1, airport layer 2 and covering 3.The inner hollow of fibre core 1, the refractive index of fibre core 1 are 1, and diameter is 10 μ m.Airport layer 2 is arranged in covering, and the airport layer in the present embodiment has three layers, and each airport layer 2 is made of a plurality of airports, is that airport layer 2 is regular hexagon and centered by fibre core.The refractive index of each airport is 1, and diameter is 10 μ m, and the pitch of holes of adjacent vacant pore is identical with the diameter of airport.Covering 3 materials are silicon dioxide, and refractive index is 1.45.The minimum centers-distance d of fibre core and innermost layer airport layer hollow pore is 17.32 μ m, and maximum distance between centers m is 20 μ m.
Fig. 2 shows the first embodiment of the present invention, comprises visible LED light source 4, single-mode fiber 5, photonic crystal fiber 6, cmos image sensor 7 based on the photon crystal optical fibre refractivity sensor.Visible LED light source 4 optical fiber are connected with an end of single-mode fiber 5, and the other end of single-mode fiber 5 is connected with photonic crystal fiber 6, and the receiver distance of the other end of photonic crystal fiber 6 and cmos image sensor 7 is 5cm.
index sensor working method shown in Figure 2 is: the airport that testing liquid is injected photonic crystal fiber, photonic crystal fiber is connected with single-mode fiber, the light that the visible LED light source sends is injected photonic crystal fiber through after single-mode fiber, because the refractive index of photonic crystal fiber hollow pore changes, luminous energy after the photonic crystal fiber transmission is changed, its transmission hot spot is received by the receiver of COMS imageing sensor after the distance of 5cm is amplified, show the power profile of transmitted light in CMOS, obtain liquid refractivity in photonic crystal fiber according to the peak power of transmitted light.This device detects the variation of liquid refractivity in PCF hollow pore just by the variation of monitoring transmitted optical power, realize the PCF refractive index sensing.
Index sensor shown in Figure 2 adopts and is of a size of 1/3 inch, resolution is that the COMS imageing sensor of 640 * 480 pixels obtains the transmitted light peak power, and measurement range is 1.45～1.8 o'clock, and the resolution of this index sensor reaches 3.657
10
-6
Fig. 3 shows the second embodiment of the present invention, comprises wideband light source 8,3dB fiber coupler 9, photonic crystal fiber 10, single-mode fiber 11, spectrometer 12 based on the photon crystal optical fibre refractivity sensor.Wideband light source 8 optical fiber are connected with a port of the 3dB fiber coupler 9 incident ends in left side, two ports of left side 3dB fiber coupler 9 exit ends are connected with an end of photonic crystal fiber 10, an end of single-mode fiber 11 respectively, the other end of the other end of photonic crystal fiber 10, single-mode fiber 11 is connected with two ports of right side 3dB fiber coupler 9 incident ends, and 3dB fiber coupler 9 exit end ports in right side are connected with spectrometer 12.
The working method of index sensor shown in Figure 3 is: the airport that testing liquid is injected photonic crystal fiber, the light of wideband light source is divided into the two-beam of luminous energy 1:1 after by the 3dB fiber coupler, a branch ofly enter in single-mode fiber as reference light, another Shu Zuowei flashlight enters photonic crystal fiber.Because the fibre core of photonic crystal fiber and the refractive index in airport change, its effective index of fundamental mode is changed, will change thereby make light transmit therein rear phase place.Through the light of outgoing after photonic crystal fiber and have phase differential between the light of single-mode fiber outgoing, become coherent light.With this coherent light input spectrum instrument, can observe the spectrum medium wave peak that caused by phase differential or the movement of trough.Therefore can obtain refringence by the movement that detects the spectrum medium wave peak, thereby obtain the refractive index of testing liquid in photonic crystal fiber.This device detects the variation of liquid refractivity in PCF hollow pore just by the drift of optical wavelength of monitoring transmitted light, realize the PCF refractive index sensing.
Index sensor employing resolution shown in Figure 3 is that the spectrometer of 0.02nm obtains transmitted spectrum, and measurement range is 1.45～1.8 o'clock, and the resolution of this index sensor reaches 6.41
10
-6
Claims (2)
1. based on the index sensor of photonic crystal fiber, comprise light source, single-mode fiber, photonic crystal fiber and imageing sensor, it is characterized in that: the output terminal of light source is connected with an end light of single-mode fiber, the other end of single-mode fiber is connected with an end light of photonic crystal fiber, and the other end of photonic crystal fiber is over against imageing sensor;
Described photonic crystal fiber comprises fibre core, airport layer and covering; Described fibre core inner hollow, the refractive index of fibre core are 1, and core diameter is 10 μ m; Described airport layer is arranged in covering and has one deck airport layer at least, every layer of air hole layer distributes around core centre, every layer of air hole layer is regular hexagon, described airport layer is comprised of a plurality of airports, the refractive index of each airport is 1, the diameter of airport is 10 μ m, and the pitch of holes of adjacent vacant pore is identical with the diameter of airport; Described clad material is silicon dioxide;
The minimum centers-distance of described fibre core and innermost layer airport layer hollow pore is 17.32 μ m, and the maximum distance between centers of described fibre core and innermost layer airport layer hollow pore is 20 μ m.
2. based on the index sensor of photonic crystal fiber, comprise wideband light source, single-mode fiber, photonic crystal fiber, a 3dB fiber coupler, the 2nd 3dB fiber coupler and spectrometer, it is characterized in that: wideband light source is connected with a port optical of 3dB fiber coupler one side, and two ports of a 3dB fiber coupler opposite side are connected with an end of photonic crystal fiber, an end light of single-mode fiber respectively; The other end of photonic crystal fiber, the other end of single-mode fiber are connected with two port opticals of the 2nd 3dB fiber coupler one side respectively, and a port of the 2nd 3dB fiber coupler opposite side is connected with spectrometer light;
Described photonic crystal fiber comprises fibre core, airport layer and covering; Described fibre core inner hollow, the refractive index of fibre core are 1, and core diameter is 10 μ m; Described airport layer is arranged in covering and has one deck airport layer at least, every layer of air hole layer distributes around core centre, every layer of air hole layer is regular hexagon, described airport layer is comprised of a plurality of airports, the refractive index of each airport is 1, the diameter of airport is 10 μ m, and the pitch of holes of adjacent vacant pore is identical with the diameter of airport; Described clad material is silicon dioxide;
The minimum centers-distance of described fibre core and innermost layer airport layer hollow pore is 17.32 μ m, and the maximum distance between centers of described fibre core and innermost layer airport layer hollow pore is 20 μ m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103149176B (en) * | 2013-02-27 | 2014-10-15 | 大连理工大学 | Multichannel refractive index sensor with integration of chirp two-dimensional photonic crystal waveguide and micro-flow channel |
| CN104792731B (en) * | 2014-12-17 | 2017-08-08 | 太原理工大学 | A kind of liquid refractive index sensor based on resonance light tunneling effect |
| CN105784196B (en) * | 2016-05-20 | 2018-07-13 | 中国电子科技集团公司第四十九研究所 | Reflective temperature sensing probe based on the double-deck photon crystal film |
| CN109445020B (en) * | 2018-12-13 | 2020-05-05 | 云南电网有限责任公司电力科学研究院 | For SF6Optical fiber for detecting gas and its decomposition component and its preparation method |
| CN118424464A (en) * | 2024-04-23 | 2024-08-02 | 东莞理工学院 | Scattering spectrometer based on chiral photonic crystal fiber |
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