CN103076303A - Stress long-period fiber grating liquid refraction index sensor based on side hole single-mode fiber - Google Patents
Stress long-period fiber grating liquid refraction index sensor based on side hole single-mode fiber Download PDFInfo
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Abstract
The invention belongs to the technical field of fiber sensing, and concretely relates to a stress long-period fiber grating liquid refraction index sensor based on a side hole single-mode fiber. A segment of the side hole single-mode fiber is placed in two periodic pressure grooves, the periodic pressure grooves are applied with a pressure to obtain a stress long-period fiber grating. When a liquid is filled to the side hole of the stress long-period fiber grating through a bare fiber adapter, the effective refraction index of a long-period fiber grating cladding changes, and the coupling resonance peak center wavelength of the long-period grating correspondingly moves with the change of the extraneous refraction index of the filled liquid. Corresponding liquid refraction index information can be demodulated by monitoring the drift amount of the long-period fiber grating resonance peak through a spectrometer. The sensor which enables the liquid to be measured to be filled to the side hole of the cladding has a high sensitivity, can realize one-time sensing measurement, and has a huge development potential in fields needing high-sensitivity biological sensing.
Description
Technical field
Patent of the present invention belongs to technical field of optical fiber sensing, is specifically related to a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber.
Background technology
In advanced information society, sensor is main path and the means of obtaining accurate information in nature and the production field.With piezoelectric type, electromagnetic type and semiconductor-type are that the traditional sensors of representative is simple with its principle, accuracy of measurement is high, low cost and other advantages is used widely.But under strong electromagnetic or inflammable and explosive occasion, be difficult to effectively detect based on the traditional sensors of electric signal measurement, therefore traditional sensor can't satisfy the needs of development of modern scientific technology.
The advantage such as compare Fibre Optical Sensor with traditional sensor and have corrosion-resistant, anti-electromagnetic interference (EMI), be suitable for using under the inflammable and explosive environment.Stressed long-period fiber gratings is to utilize the periodic pressure groove to the single-mode fiber axial pressure, makes the vertically physics minor bending change of generating period of optical fiber, forms long period fiber grating.This kind method is compared with the method for making of traditional long period fiber grating, have make simple, with low cost.Adopt simultaneously in covering lateral opening and pour into testing liquid, sensitivity is higher, can realize disposable sensing measurement, and huge development potentiality is arranged in needing the high-sensitivity biological sensory field.
Summary of the invention
For problems of the prior art, the purpose of patent of the present invention is to provide a kind of stressed long-period fiber gratings liquid refractive index sensor technical scheme based on lateral opening single-mode fiber.
Described a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber, it is characterized in that comprising wideband light source, spectrometer, two bare fiber adaptors, lateral opening single-mode fiber, the periodic pressure groove, one end of described the first bare fiber adaptor connects wideband light source, the other end is connected with lateral opening single-mode fiber one end, port of the lateral opening single-mode fiber other end and the second bare fiber adaptor is connected, the second bare fiber adaptor other end connects spectrometer, one section of described lateral opening single-mode fiber is positioned in two periodic pressure grooves, obtains stressed long-period fiber gratings thereby exert pressure to the periodic pressure groove at lateral opening single-mode fiber.
Described a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber, it is characterized in that one section in the lateral opening single-mode fiber places between the two block periodicity head tanks, by exerting pressure to the periodic pressure groove, obtain stressed long-period fiber gratings at lateral opening single-mode fiber.
Described a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber, the lateral opening single-mode fiber two ends that it is characterized in that the pressure long period fiber grating are connected with two bare fiber adaptors respectively, form open measuring refractive indexes of liquid structure.
Described a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber is characterized in that two apertures of lateral opening single-mode fiber of pressure long period fiber grating are arranged in fibre cladding, pours in real time liquid to be measured at Kong Zhongke.
The advantage of patent of the present invention is: adopt the periodic pressure groove that lateral opening single-mode fiber is exerted pressure and obtain long period fiber grating, making is simple, and is with low cost, can obtain the long period fiber grating of different parameters structure by the cycle that changes head tank; In addition, this installs used optical fiber is lateral opening single-mode fiber, in liquid enters single-mode fiber lateral opening, compares with the long period liquid refractive index sensor of routine, cladding-effective-index changes sensitiveer, therefore can obtain higher liquid refracting measurement result, this transducer arrangement configuration is compact, and volume is little, cost is low, make simply, highly sensitive, can be widely used in various high-sensitivity biologicals and learn in the sensings.
Description of drawings
Fig. 1 is patent structure synoptic diagram of the present invention, and Fig. 2 is the end view that patent of the present invention is made the required periodic pressure groove of stressed long-period fiber gratings.Fig. 3 is the end view of the lateral opening single-mode fiber of patent of the present invention.
Embodiment
Below in conjunction with Figure of description patent of the present invention is described further.
As shown in Figure 1, a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber, comprise wideband light source 1, two bare fiber adaptors 2,3, periodic pressure groove 4, lateral opening single-mode fiber 5, spectrometer 6, one end of described the first bare fiber adaptor 2 connects wideband light source 1, the first bare fiber adaptor 2 other ends are connected with lateral opening single-mode fiber 5 one ends, lateral opening single-mode fiber 5 other ends are connected with the second bare fiber adaptor 3 one ends, the second bare fiber adaptor 3 other ends connect spectrometer 6, one section with lateral opening single-mode fiber 5 is positioned in two periodic pressure grooves 4, obtains stressed long-period fiber gratings thereby exert pressure to periodic pressure groove 4 at lateral opening single-mode fiber 5.Behind the light process stressed long-period fiber gratings that wideband light source 1 sends, export the stressed long-period fiber gratings transmission spectrum at spectrometer 6 output ports.
The working method of patent of the present invention is: the light that wideband light source sends enters lateral opening single-mode fiber through bare fiber adaptor, exports spectrometer to through bare fiber adaptor again after propagating in lateral opening single-mode fiber.The single mode side-hole fiber is through the compacting of periodic pressure groove, and it is the physics minor bending change of generating period vertically, because photoelastic effect makes the also change of generating period of optical fibre refractivity, thereby forms the long stress cycle grating.When liquid pours into the lateral opening of stressed long-period fiber gratings by bare fiber adaptor, change the effective refractive index of long period fiber grating covering, thereby the transmission mode in the change long period fiber grating, these cause the coefficient of cladding mode and guided mode coupling and the change of phase matching wavelengths, and finally the change by absorption peak strength in the transmission spectrum and centre wavelength shows.Along with the variation that pours into the extraneous refractive index of liquid, the coupling resonance peak center wavelength of long-period gratings produces corresponding mobile.Drift value by spectrometer monitoring long period fiber grating harmonic peak produces just can demodulate corresponding liquid refractivity information.
Patent of the present invention can realize that the gordian technique of high-sensitivity measurement is: utilize the periodic pressure groove that lateral opening single-mode fiber stress application is made and obtain long period fiber grating, make simply low processing cost; In optical fiber is lateral opening, pour in real time liquid by bare fiber adaptor simultaneously, because lateral opening in the covering of optical fiber, being in the fibre cladding surface with traditional liquid compares, liquid refractivity change can be sensitiveer change long period fiber grating cladding-effective-index, by detecting the drift value of long period fiber grating harmonic peak, can obtain the refractive index of liquid.
In the present embodiment, the lateral opening single-mode fiber core diameter of selecting is standard single-mode fiber, and cladding diameter 125 μ m have the lateral opening of two symmetries in the covering, and the diameter in hole is at 30-50 μ m.The periodic pressure groove cycle is 0.3-0.6mm, and groove depth is about 0.3mm.
Claims (4)
1. stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber, it is characterized in that comprising wideband light source (1), two bare fiber adaptors (2,3), periodic pressure groove (4), lateral opening single-mode fiber (5), spectrometer (6), one end of described the first bare fiber adaptor (2) connects wideband light source (1), the first bare fiber adaptor (2) other end is connected with lateral opening single-mode fiber (5) one ends, lateral opening single-mode fiber (5) other end is connected with the second bare fiber adaptor (3) one ends, the second bare fiber adaptor (3) other end connects spectrometer (6), one section with lateral opening single-mode fiber (5) is positioned in two periodic pressure grooves (4), to periodic pressure groove (4) thus exert pressure and obtain stressed long-period fiber gratings at lateral opening single-mode fiber (5).
2. a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber according to claim 1, it is characterized in that one section in the lateral opening single-mode fiber (5) places between the two block periodicity head tanks (4), by exerting pressure to the periodic pressure groove, obtain stressed long-period fiber gratings at lateral opening single-mode fiber.
3. a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber according to claim 1, lateral opening single-mode fiber (5) two ends that it is characterized in that the pressure long period fiber grating are connected with two bare fiber adaptors (2,3) respectively, form open measuring refractive indexes of liquid structure.
4. a kind of stressed long-period fiber gratings liquid refractive index sensor based on lateral opening single-mode fiber according to claim 1, (5) two apertures of lateral opening single-mode fiber that it is characterized in that the pressure long period fiber grating are arranged in fibre cladding, pour in real time liquid to be measured at Kong Zhongke.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210516235 CN103076303A (en) | 2012-12-03 | 2012-12-03 | Stress long-period fiber grating liquid refraction index sensor based on side hole single-mode fiber |
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| CN 201210516235 CN103076303A (en) | 2012-12-03 | 2012-12-03 | Stress long-period fiber grating liquid refraction index sensor based on side hole single-mode fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678503A (en) * | 2015-03-11 | 2015-06-03 | 哈尔滨工程大学 | Optical fiber optical switch based on photothermal effect |
| CN104914507A (en) * | 2015-06-02 | 2015-09-16 | 哈尔滨工程大学 | Micro-nano fiber filter |
| CN112816094A (en) * | 2020-12-31 | 2021-05-18 | 瑞尔通(苏州)医疗科技有限公司 | Sensing optical fiber, sensing assembly, sensor and decoupling method thereof |
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2012
- 2012-12-03 CN CN 201210516235 patent/CN103076303A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678503A (en) * | 2015-03-11 | 2015-06-03 | 哈尔滨工程大学 | Optical fiber optical switch based on photothermal effect |
| CN104914507A (en) * | 2015-06-02 | 2015-09-16 | 哈尔滨工程大学 | Micro-nano fiber filter |
| CN112816094A (en) * | 2020-12-31 | 2021-05-18 | 瑞尔通(苏州)医疗科技有限公司 | Sensing optical fiber, sensing assembly, sensor and decoupling method thereof |
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Application publication date: 20130501 |