CN102226763B - AWG-based star-shaped topological quasi-distributed multipoint refractive index sensing system - Google Patents
AWG-based star-shaped topological quasi-distributed multipoint refractive index sensing system Download PDFInfo
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- CN102226763B CN102226763B CN 201110088224 CN201110088224A CN102226763B CN 102226763 B CN102226763 B CN 102226763B CN 201110088224 CN201110088224 CN 201110088224 CN 201110088224 A CN201110088224 A CN 201110088224A CN 102226763 B CN102226763 B CN 102226763B
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Abstract
The invention relates to an AWG-based star-shaped topological quasi-distributed multipoint refractive index sensing system, which is characterized in that a broadband light source is optically connected with an input port of a circulator; a second port of the circulator is optically connected with an AWG; each output port of the AWG is optically connected with a single-mode fiber with an evenly cut end face; a third port of the circulator is optically connected with another AWG; and each output port of the AWG is electrically connected with a photoelectric converter and signal processing unit. In allusion to defects of expensive price, distributed sensing difficulty and high demodulation cost in present fiber refractive index sensors, the invention provides an AWG-based star-shaped topological quasi-distributed multipoint refractive index sensing system which has a compact structure and cheap price, is easy to produce and based on intensity demodulation, and can accomplish distributed sensing.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to a kind of quasi-distributed multiple spot refractive index sensing of star topology system based on array waveguide grating (Arrayed Waveguide Grating, AWG).
Background technology
Refractive index is used one of upper important physical parameter as engineering, and its measuring method is diversified.Common are laser irradiation, Mechanical Study On Young Interference method and Abbe refractometer mensuration etc.But these measuring methods are very high and can not use under rugged surroundings to the stability requirement of experimental implementation and instrument.
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 as the mechanism of refractometry medium with optical fiber, such as the fiber grating index sensor that causes wave length shift based on the external environment variations in refractive index, be subject to people's attention because having unique advantage based on the F-P interfere type index meter of hollow-core photonic crystal fiber etc.Yet the remolding sensitivity that Fiber Bragg Grating FBG is used as index sensor is lower, need to could realize refractive index sensing through pre-service such as excessive erosion, and so in use, optical fiber easily sustains damage, and multiplexing measurement is put to no little inconvenience; The long period fiber grating index sensor is because its extreme susceptibility to bending, in the refractometry process, very easily introduce the interference that to predict, therefore require very high to measuring condition, and the transmitted spectrum broader bandwidth of long-period gratings, be difficult to realize the multiplexing multiple spot refractometry of carrying out; Photonic crystal fiber trace, the high precision refraction rate of doing biochemical field commonly used measured, and the sensing cost is higher, usually needs during measurement test substance is fed in the airport of optical fiber, and also can't well realize the multiple spot distributed sensing at present.
For the problems referred to above, we have proposed the quasi-distributed multiple spot refractive index sensing of a kind of star topology based on AWG system.This measuring system compact conformation, with low cost, but duplicate measurements, sensing capabilities is stable, possesses Fibre Optical Sensor insensitive to electromagnetic interference (EMI), highly sensitive, the advantages such as volume is little, and is anticorrosive have more realized quasi-distributed refractometry, and based on intensity demodulation, greatly reduced the cost of demodulated equipment.
Summary of the invention
The object of the invention be exactly for the existing fiber index sensor exist expensive, be difficult to realize distributed sensing, demodulation high in cost of production shortcoming, proposed a kind of compact conformation, low price, making simple, based on intensity demodulation, can realize the quasi-distributed multiple spot refractive index sensing of the star topology based on the AWG system of distributed sensing.
The present invention is that the technical scheme that the technical solution problem is taked is:
The quasi-distributed multiple spot refractive index sensing of a kind of star topology based on AWG system comprises wideband light source, circulator, AWG, single-mode fiber, photoelectric commutator and signal processing unit.
Wideband light source is connected with the input end light of circulator, optically-coupled is advanced second port of circulator through the effect of circulator, second port is connected with AWG light, each output terminal of AWG is connected with the smooth single-mode fiber light of ends cutting respectively, each light path after the AWG light splitting is at corresponding single-mode fiber end face generation Fresnel reflection, catoptrical intensity is relevant with the external environment refractive index, reflected light is exported by the 3rd port through the circulator effect, this port is connected with another AWG light, each output terminal of AWG is connected with photoelectric commutator and signal processing unit light, so that again beam splitting of the light behind the single-mode fiber end face reflection, and carry out corresponding opto-electronic conversion, thereby demodulation draws refractive index information.
The beneficial effect that the present invention has is:
1. utilize minute light action of AWG, light can be divided into multichannel, form the topological structure of a starlike distribution, realize quasi-distributed multimetering.
2. this sensor-based system is based on the Fresnel reflection principle, utilize the smooth single-mode fiber of ends cutting as sensing head, be easy to make, with low cost, and it is high or be subject to Bending Influence to have overcome the sensitivity that occurs in the fiber grating index sensor, be difficult to realize the shortcomings such as distributed refractive index sensing measurement, simultaneously relatively Photonic Crystal Fiber Sensor has the advantage of online detection, can not will testing liquid extract and be fed in the airport.
3. in sense measuring device, introduce electrooptical device, needn't re-use spectrometer observation wavelength and move demodulation and obtain refractive index information, greatly reduced the cost of sensing equipment.
4. whole sense measuring device has compact conformation, low price, and precision is high, and reusability is strong, but the advantages such as distributed sensing can be widely used in various refractive index detection fields.
Description of drawings
Fig. 1 is structure drawing of device of the present invention;
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
As shown in Figure 1, the quasi-distributed multiple spot refractive index sensing of a kind of star topology based on AWG system mainly comprises wideband light source 1, circulator 2, AWG3, single-mode fiber 4, photoelectric commutator and signal processing unit 5.Wideband light source 1 is connected with the input end light of circulator 2, optically-coupled is advanced second port of circulator 2 through the effect of circulator 2, second port is connected with AWG3 light, each output terminal of AWG3 is connected with smooth single-mode fiber 4 light of ends cutting respectively, each light path after the AWG3 light splitting is at corresponding single-mode fiber 4 end face generation Fresnel reflections, catoptrical intensity is relevant with the external environment refractive index, reflected light is exported by the 3rd port through circulator 2 effects, this port is connected with another AWG3 light, each output terminal of AWG3 is connected with photoelectric commutator and signal processing unit 5 light, so that the again beam splitting of light behind single-mode fiber 4 end face reflections, and carry out corresponding opto-electronic conversion, thereby demodulation draws refractive index information.
The working method of present embodiment is: the light that wideband light source sends advances AWG through the effect of circulator with optically-coupled, AWG utilizes the principle of multipath interference that broadband light is divided into multichannel by the frequency difference and exports through output port, the centre wavelength of each road light is all not identical, light wave along separate routes is coupled into the smooth single-mode fiber of ends cutting via the output terminal of AWG, and at the end face generation Fresnel reflection of single-mode fiber, principle based on Fresnel reflection, the reflectivity of single-mode fiber end face is relevant with the refractive index of this fiber end face environment of living in, satisfies formula (1):
N wherein
fBe the effective refractive index of optical fiber, n
oBe the refractive index of external environment, therefore catoptrical intensity is relevant with external environment.
The light of each end face reflection of single-mode fiber is coupled into the identical AWG of another model through the 3rd port of circulator, through again calculating each central wavelength energy variation after light splitting and the electrooptical device effect, and then demodulate each single-mode fiber end refractive index information, realize quasi-distributed refractive index sensing.
The present invention can realize that the quasi-distributed refractive index sensing of star topology structure is measured, the gordian technique of reduction cost is:
1. utilize minute light action of AWG, light can be divided into multichannel, form the topological structure of a starlike distribution, realize quasi-distributed multimetering.
2. this sensor-based system is based on the Fresnel reflection principle, utilize the smooth single-mode fiber of ends cutting as sensing head, be easy to make, with low cost, and it is high or be subject to the shortcomings such as Bending Influence to have overcome the sensitivity that occurs in the fiber grating index sensor, simultaneously relatively Photonic Crystal Fiber Sensor has the advantage of online detection, can not will testing liquid extract and be fed in the airport.
3. in sense measuring device, introduce electrooptical device, needn't re-use spectrometer observation wavelength and move demodulation and obtain refractive index information, greatly reduced the cost of sensing equipment.
Single-mode fiber in the present embodiment is common SMF-28 single-mode fiber, and fiber lengths is determined by the distance of tested point to the AWG output terminal; AWG has 16 delivery channels, and channel spacing is 100GHz, and output terminal tail optical fiber type is the waveguide array grating of naked fibre.
Claims (2)
1. the quasi-distributed multiple spot refractive index sensing of the star topology based on AWG system, comprise wideband light source (1), circulator (2), AWG (3), single-mode fiber (4), photoelectric commutator and signal processing unit (5), it is characterized in that: wideband light source is connected with the input end light of circulator, optically-coupled is advanced second port of circulator through the effect of circulator, second port is connected with AWG light, each output terminal of AWG is connected with the smooth single-mode fiber light of ends cutting respectively, each light path after the AWG light splitting is at corresponding single-mode fiber end face generation Fresnel reflection, catoptrical intensity is relevant with the external environment refractive index, reflected light is exported by the 3rd port through the circulator effect, this port is connected with another AWG light, each output terminal of AWG is connected with photoelectric commutator and signal processing unit light, so that again beam splitting of the light behind the single-mode fiber end face reflection, and carry out corresponding opto-electronic conversion, thereby demodulation draws refractive index information.
2. the quasi-distributed multiple spot refractive index sensing of a kind of star topology based on AWG as claimed in claim 1 system, it is characterized in that AWG utilizes the principle of multipath interference that broadband light is divided into multichannel by the frequency difference and exports through output port, form the topological structure of a starlike distribution, realize quasi-distributed multimetering.
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| CN105372206B (en) * | 2015-11-05 | 2018-10-30 | 沃派物联网科技(天津)有限公司 | Parallel remote optical fiber sensing system for the detection of multiple gases refractive index |
| CN107238582A (en) * | 2017-05-02 | 2017-10-10 | 太原理工大学 | A kind of material refractive index remote measuring unit and its measuring method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2187132A1 (en) * | 1996-10-04 | 1998-04-04 | Michel Leblanc | Optical time domain reflectometer with internal reference reflector |
| CN1423140A (en) * | 2001-12-04 | 2003-06-11 | 中国科学院半导体研究所 | Integrated structure of array waveguide grating and optical fiber array and manufacture method thereof |
| CN101135640A (en) * | 2007-07-06 | 2008-03-05 | 华南师范大学 | Quasi-distributed optical fiber concentration sensor |
| CN101793821A (en) * | 2010-03-23 | 2010-08-04 | 北京交通大学 | Sensing system used for monitoring multipoint gas concentration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6791690B2 (en) * | 2002-04-30 | 2004-09-14 | Agilent Technologies, Inc. | Reading dry chemical arrays |
| US7126693B2 (en) * | 2004-03-29 | 2006-10-24 | Carl Zeiss Meditec, Inc. | Simple high efficiency optical coherence domain reflectometer design |
| JP2008139170A (en) * | 2006-12-01 | 2008-06-19 | Fuji Heavy Ind Ltd | System for detecting impact |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2187132A1 (en) * | 1996-10-04 | 1998-04-04 | Michel Leblanc | Optical time domain reflectometer with internal reference reflector |
| CN1423140A (en) * | 2001-12-04 | 2003-06-11 | 中国科学院半导体研究所 | Integrated structure of array waveguide grating and optical fiber array and manufacture method thereof |
| CN101135640A (en) * | 2007-07-06 | 2008-03-05 | 华南师范大学 | Quasi-distributed optical fiber concentration sensor |
| CN101793821A (en) * | 2010-03-23 | 2010-08-04 | 北京交通大学 | Sensing system used for monitoring multipoint gas concentration |
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