CN203561381U - A polarization-interference-type fully-distributed double-parameter optical fiber sensor - Google Patents
A polarization-interference-type fully-distributed double-parameter optical fiber sensor Download PDFInfo
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- CN203561381U CN203561381U CN201320530235.2U CN201320530235U CN203561381U CN 203561381 U CN203561381 U CN 203561381U CN 201320530235 U CN201320530235 U CN 201320530235U CN 203561381 U CN203561381 U CN 203561381U
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Abstract
The utility model discloses a polarization-interference-type fully-distributed double-parameter optical fiber sensor. The polarization-interference-type fully-distributed double-parameter optical fiber sensor is characterized in that a polarization interference light path is formed by connecting a laser device, a polarizer P1, a beam splitter 1, a circulator C1, a side hole optical fiber, a circulator C2, a polarization analyzer P2, a beam binding device 1, and a detector PD1 successively, and that the other polarization interference light path is formed by connecting the polarizer P1, a beam splitter 2, the circulator C2, the side hold optical fiber, the circulator C1, a polarization analyzer P3, a beam binding device 2, and a detector PD2 successively. According to the polarization-interference-type fully-distributed double-parameter optical fiber sensor, polarization interference and the side hole optical fiber are combined so as to achieve fully-distributed optical fiber pressure and temperature double-parameter sensing, and effectively improve cross sensitivity responses of pressure and temperature. In addition, the polarization-interference-type fully-distributed double-parameter optical fiber sensor has a capability of operating under severe environment with high temperature, high pressure, and corrosivity, and may accurately measure phases by using polarization-interference and accurately demodulate phase information.
Description
Technical field
The utility model belongs to fields of measurement, in particular to full distributed pair of parameteric light fiber sensor of polarization interference type and application thereof.
Background technology
Along with development and the continuous increase to petroleum demand of petroleum industry, oil-gas exploration and development progressively excavates to profound level, and the quantity of hp-ht well is in continuous growth.The parameters such as oil well downforce, temperature are carried out to Real-Time Monitoring, are the physical states of understanding down-hole oil reservoir, optimize oil recovery technique scheme, improve one of important measures of the rate of oil and gas recovery and output.Aspect marine physics monitoring, temperature and pressure is two Important Parameters of oceanophysics, and they are of great significance field tools such as the observation of research marine hydrometeorology, marine environmental monitoring and sea fishery.In addition, the measurement of pressure and temperature also has great importance in fields such as commercial production, safety monitoring, spationauticies.Along with pressure, temperature measurement application technology are constantly extended and expansion, the demand of the two parameter measurements of distributed temperature and pressure is more and more obvious, but the realization of the two parameter measurements of current full distributed temperature and pressure remains a challenging problem.
The two parameter measurement sensors of current temperature and pressure are mainly single-point type and quasi-distributed multimetering sensor, such as the multipoint mode sensor based on electronic component.
The Fibre Optical Sensor report that can carry out temperature, the two parameter measurements of pressure has two kinds, and a kind of is that two single parametrical sense devices are combined to realize the two parameter measurements of temperature and pressure, and another kind is sensor two parameters of response temperature pressure simultaneously itself.
The first is that temperature sensor and pressure transducer are formed by certain Combination of Methods.If the people such as Wang Qi are by Fabry Perot chamber Fibre Optical Sensor and FBG(Fiber Bragg Grating) sensor combinations is for the two parameter measurements of down-hole temperature and pressure; The people such as Qiao Xue light have proposed a kind of based on the two FBG sensors of thin wall cylindrical housing, in 0-7MPa and 22.6-112.6 ℃, have carried out two parameter measurements experiments.The sensor that the people such as Wang Hong-Liang utilize two FBG to form has carried out temperature and pressure experiments of measuring simultaneously, and sensing range is 0-20MPa and 0-315 ℃, and points out to have the ability of quasi-distributed sensing.The people such as military wound adopt the method for shaddock type microstructure fiber Bragg grating and conventional fiber grating combination, at 0-40MPa and 25 ℃ of-200 ℃ of scopes, have carried out temperature and static pressure while experiments of measuring.The people such as Xiangdong Zhang utilize two Bragg-grating structure sensors of special package to carry out quasi-distributed sensing experiment, and measurement range is 0-100MPa and 0-360 ℃, point out to utilize the WDM technology at most can seven sensors of cascade.
The second is that the characteristic of utilizing sensing head itself all to possess response to temperature and pressure is measured.At present the achievement in research of this class sensor report is mainly spot measurement result, still immature at aspects such as the realization of multimetering, temperature and pressure cross response separation, sensor head constructions.As the Center for Photonic Technology of Virginia, USA Polytechnics, once utilized bushing type list multimode optical fiber complex eigen Fabry Perot chamber to realize the pressure survey at 600 ℃ of high temperature, this sensor possesses temperature measurement capabilities and quasi-distributed measurement potentiality simultaneously, but the manufacture craft difficulty of this kind of sensor is larger at present, pressure sensitivity still needs to improve.The people such as military wound, Guan Baiou utilize the Fa-Po cavity Fibre Optical Sensor of photonic crystal fiber and single-mode fiber welding formation, possess High Temperature High Pressure responding ability, within the scope of 0-40MPa and 25 ℃-700 ℃, have carried out experimental study.
Multipoint mode sensor based on electronic technology, due to the defect of electron device self, is difficult to adapt to the working environment of High Temperature High Pressure, is inevitably subject to the interference of electromagnetic radiation simultaneously; Existing optical fiber sensing technology is mainly single-point type or quasi-distributed measurement mechanism, fails to realize full distributed pressure, the two parameter measurements of temperature.
Utility model content
Problem to be solved in the utility model is to provide a kind of sensor that can realize pressure, full distributed pair of parameter measurement of temperature.For solving the problems of the technologies described above, the scheme the utility model proposes is full distributed pair of parameteric light fiber sensor of a kind of polarization interference type, this sensor comprises: laser instrument-polarizer P1-beam splitter 1-circulator C1-side-hole fiber-circulator C2-analyzer P2-bundling device 1-detector PD1, and above-mentioned parts connect and compose a road polarization interference light path successively; Polarizer P1-beam splitter 2-circulator C2-side-hole fiber-circulator C1-analyzer P3-bundling device 2-detector PD2, above-mentioned parts form another road polarization interference light path; Wherein said device adopts optical fiber components to be connected to form light path, and described optical fiber components, with fibre-optical splice, utilizes optical fiber ring flange and/or optical fiber splicer welding optic fibre to be directly connected.
In a preferred implementation of the present utility model, it is characterized in that described side-hole fiber circle core circular hole structure or oval core circular hole structure, two aire tunnels are distributing to symmetry in the covering around fiber cores.
In a preferred implementation of the present utility model, it is characterized in that described detector PD1 is connected with computer with detector PD2.
In a preferred implementation of the present utility model, it is characterized in that described polarizer fibre optic polarizing beam splitter and analyzer are optical fiber analyzer.
The utility model also relates to the application in detected temperatures and pressure at the same time of full distributed pair of parameteric light fiber sensor of above-mentioned polarization interference type on the other hand.
In a preferred implementation of the present utility model, described application comprises that the light of laser instrument obtains the vertical linearly polarized light of two bundle direction of vibration by polarizer P1, make the linearly polarized light of vertical direction vibration of forward transmission consistent with side-hole fiber quick shaft direction, through beam splitter 1 beam splitting rear portion, through side-hole fiber, arrive bundling device 1, another part directly arrives bundling device 1, and polarization interference finally occurs two-beam; The linearly polarized light of the horizontal direction vibration of reverse transfer forms polarization interference light path 2.
Full distributed pair of parameteric light fiber sensor of polarization interference type of the present utility model combines polarization interference with side-hole fiber, can realize fully distributed fiber pressure, the two parametrical senses of temperature, effectively improve the cross sensitivity response of pressure and temp, possess the rugged surroundings abilities to work such as High Temperature High Pressure, corrosion resistance simultaneously, utilize the advantage that polarization interference can precision measuring phase position, accurately demodulation phase information.
Accompanying drawing explanation
Fig. 1: full distributed pair of parameteric light fiber sensor structural representation of polarization interference type;
Fig. 2: the structural representation of side-hole fiber.
Embodiment:
Adopt the sensor of two-way polarization interference system as shown in Figure 1.Polarized light forms a road polarization interference by polarizer P1-beam splitter 1-circulator C1-side-hole fiber-circulator C2-analyzer P2-bundling device 1-detector PD1; In like manner, polarized light forms another road polarization interference by polarizer P1-beam splitter 2-circulator C2-side-hole fiber-circulator C1-analyzer P3-bundling device 2-detector PD2, polarizer P1 obtains the vertical linearly polarized light of two bundle direction of vibration, make the linearly polarized light of vertical direction vibration of forward transmission consistent with side-hole fiber quick shaft direction, through beam splitter 1 beam splitting rear portion, through side-hole fiber, arrive bundling device 1, another part directly arrives bundling device 1, and polarization interference finally occurs two-beam; In like manner, the linearly polarized light of the horizontal direction of reverse transfer vibration forms polarization interference light path 2.For reducing loss, simplify coupling fiber, the polarizer and analyzer can be used fibre optic polarizing beam splitter and optical fiber analyzer.
Aspect light path design, due to the light buffer action of circulator C1, transmission light can not enter C1 incident end in the other direction, therefore can not see through beam splitter 1 and polarizer P1, can not have influence on the light intensity that is entered detector PD1 by beam splitter 1; The light buffer action of circulator C2 also makes forward transmission light not affect the transmission light that enters detector PD2, this cleverly design make not interfere with each other between two-way interference spectrum and other light paths, assurance easily and effectively stability and the accuracy of two-way polarization interference.The use of polarization interference method not only can accurately be measured bit phase delay, and can avoid the inconvenience in traditional measurement method, the high requirement of light source and test macro stability brought.
Known according to the existing side-hole fiber fresenl theory of double refraction, in core region, as shown in Figure 2, the direction of principle stress is parallel to x axle and y axle.And the initial mentality of designing of side-hole fiber makes to respond as anisotropy for the birefringence of pressure, to the response of temperature, be isotropy.Owing to existing lateral opening at x direction of principal axis, core region is mainly because ambient pressure effect causes in the make progress change of refractive index of the party, the effect of this directional pressure will be much larger than temperature, and this is also that the response sensitivity of side-hole fiber pressure is much larger than the reason of temperature-responsive sensitivity.And at y direction of principal axis, the tension at y direction of principal axis, core region being produced due to temperature will be much larger than x direction of principal axis, so the principal element of core region refraction index changing is temperature.And the quick shaft direction that x direction of principal axis is side-hole fiber, y axle is slow-axis direction.If by the direction of vibration of two linearly polarized lights of reverse transfer respectively along quick shaft direction and slow-axis direction, can there is the impact of the main induction pressure of linearly polarized light of a direction, the linearly polarized light of another direction is mainly experienced the impact of temperature, utilize the method for twin-beam transmission to realize two parameter responses of temperature and pressure, and effectively improve the cross response of temperature and pressure.
The technical solution of the utility model has adopted comparatively reasonably mentality of designing, can realize fully distributed fiber pressure, the two parametrical senses of temperature, effectively improve the cross sensitivity response of pressure and temp, has utilized the advantage that polarization interference can precision measuring phase position simultaneously.
The above, be only embodiment of the present utility model, but protection domain of the present utility model is not limited to this, and any variation of expecting without creative work or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain that claims were limited.
Claims (4)
1. full distributed pair of parameteric light fiber sensor of a polarization interference type, it is characterized in that this sensor comprises: laser instrument-polarizer P1-beam splitter 1-circulator C1-side-hole fiber-circulator C2-analyzer P2-bundling device 1-detector PD1, above-mentioned parts connect and compose a road polarization interference light path successively; Polarizer P1-beam splitter 2-circulator C2-side-hole fiber-circulator C1-analyzer P3-bundling device 2-detector PD2, above-mentioned parts form another road polarization interference light path; Wherein said parts adopt optical fiber components to be connected to form light path, and described optical fiber components, with fibre-optical splice, utilizes optical fiber ring flange and/or optical fiber splicer welding optic fibre to be directly connected.
2. full distributed pair of parameteric light fiber sensor of polarization interference type according to claim 1, the structure that it is characterized in that described side-hole fiber is circle core circular hole structure or oval core circular hole structure, and two aire tunnels are distributing to symmetry in the covering around fiber cores.
3. full distributed pair of parameteric light fiber sensor of polarization interference type according to claim 1, is characterized in that described detector PD1 is connected with computer with detector PD2.
4. according to the full distributed pair of parameteric light fiber sensor of polarization interference type described in claim 1-3 any one, it is characterized in that the described polarizer is fibre optic polarizing beam splitter; Analyzer is optical fiber analyzer.
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| CN201320530235.2U CN203561381U (en) | 2013-08-27 | 2013-08-27 | A polarization-interference-type fully-distributed double-parameter optical fiber sensor |
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| CN201320530235.2U CN203561381U (en) | 2013-08-27 | 2013-08-27 | A polarization-interference-type fully-distributed double-parameter optical fiber sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103453937A (en) * | 2013-08-27 | 2013-12-18 | 中国石油大学(华东) | Polarized light interference type full distributing type double-parameter optical fiber sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103453937A (en) * | 2013-08-27 | 2013-12-18 | 中国石油大学(华东) | Polarized light interference type full distributing type double-parameter optical fiber sensor |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140423 Termination date: 20150827 |
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