CN105388433A - Magnetic localization logging device based on optical fiber weak magnetic field sensing - Google Patents
Magnetic localization logging device based on optical fiber weak magnetic field sensing Download PDFInfo
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- CN105388433A CN105388433A CN201510685801.0A CN201510685801A CN105388433A CN 105388433 A CN105388433 A CN 105388433A CN 201510685801 A CN201510685801 A CN 201510685801A CN 105388433 A CN105388433 A CN 105388433A
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- Prior art keywords
- optical fiber
- magnetic
- fiber
- magnetic field
- optical
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
- G01R33/0327—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect with application of magnetostriction
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
- E21B47/092—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes by detecting magnetic anomalies
Abstract
The invention provides relates to the field of optical fiber sensing technology, in particular to a magnetic localization logging device based on optical fiber weak magnetic field sensing. The magnetic localization logging device comprises an optical fiber sensing light source, a polarization controller, an optical fiber circulator, an optical fiber FBG F-P magnetic sensitive sensor which are sequentially connected, wherein the optical fiber circulator is connected with an optical fiber coupler, the optical fiber coupler is respectively connected with a Faraday rotator mirror I, a phase modulator and a photoelectric detector, the phase modulator is connected with a Faraday rotator mirror II, and the photoelectric detector, an A/D data acquisition card and an embedded CPU processor are sequentially connected. The magnetic localization logging device can achieve the magnetic localization logging under harsh environments of high temperature, high pressure, strong electromagnetic interference and the like, measures the size of a magnetic field accurately and achieves accurate positioning of underground coupling through combining the cavity length variation of an optical fiber FBG F-P magnetic sensitive structure under the action of the magnetic field and high-precision optical wave phase signal demodulation, and has good stability.
Description
Technical field:
The present invention relates to technical field of optical fiber sensing, particularly a kind of magnetic orientation well logging apparatus based on fiber optic weak magnetic field sensing.
Background technology:
The application of magnetic field measurement technology has been deep into each departments such as industry, agricultural, national defence and biology, medical science, aerospace.The technology and method realizing weak magnetic fields measurement is a lot, as fluxgate method, magneto-optic pump method, Superconducting Quantum device interferometric method.But the magnetic-field measurement of a lot of particular surroundings, as the test of High Temperature High Pressure oil country tubular good magnetic orientation, conventional electrical formula surveying instrument, by restrictions such as temperature limiting, electromagnetic interference (EMI) and Signal transmissions, is difficult to the measurement realizing high precision, high reliability, even cannot completes measurement.Fibre Optical Sensor has the significantly technical advantage such as high sensitivity, high precision, great dynamic range, electromagnetism interference and high temperature high voltage resistant, receive worldwide concern, although all carried out both at home and abroad relevant research, domestic also relatively backwardness, relevant report is also fewer.And generally all lack concrete technological parameter and experimental result in external report.
Have based on the Mach-Zehnder interference optical fibre magnetic field sensors of magnetostrictive effect, based on magnetostrictive effect Michelson interference optical fibre magnetic field sensors, Fabry-Perot interference optical fibre magnetic field sensors and Bragg grating optical fiber magnetic field sensor etc. for the Fibre Optical Sensor measuring magnetic field at present.
Mach-Zehnder interference optical fibre magnetic field sensors based on magnetostrictive effect is consistent with the ultimate principle of Michelson interferometric optical fiber sensor.These two kinds of sensor constructions are simple, but as comparatively large in vibrations, fibre-optical bending etc. affect by environment, and when light transmits in the optical path, polarization state random variation etc. all affect the stability of measurement result.Fabry-Perot interference optical fibre magnetic field sensors good stability, but measuring accuracy is relatively low.Simple based on Bragg grating optical fiber magnetic field sensor structure, sensitivity is not high, and there is the cross-sensitivity with temperature.
Summary of the invention:
The technical problem to be solved in the present invention is to provide a kind of magnetic orientation well logging apparatus based on fiber optic weak magnetic field sensing, the arrangement achieves and can carry out magnetic orientation well logging under the rugged surroundings such as high temperature, high pressure, strong electromagnetic, by optical fiber FBGF-P chamber magnetic susceptibility structure in the long change of magnetic fields cavity of resorption, combined high precision phase of light wave signal receiving, accurately measure magnetic field size and realize down-hole box cupling and accurately locate, good stability.The fiber sensor measuring precision overcoming existing measurement magnetic field is low, the deficiency of poor stability.
The technical solution used in the present invention is: a kind of magnetic orientation well logging apparatus based on fiber optic weak magnetic field sensing, comprises Fibre Optical Sensor light source, Polarization Controller and embedded type CPU processor; Fibre Optical Sensor light source, Polarization Controller, optical fiber circulator, optical fiber FBGF-P magnetic susceptibility sensor connect in turn, optical fiber circulator is connected with fiber coupler, fiber coupler is connected with faraday rotation mirror I, phase-modulator, photodetector respectively, phase-modulator is connected with faraday rotation mirror II, and photodetector, A/D data collecting card, embedded type CPU processor connect in turn; Optical fiber FBGF-P magnetic susceptibility sensor comprises an optical fiber, on optical fiber, interval certain length inscribes two consistent fiber gratings of reflection kernel wavelength, reflectivity and reflection spectrum bandwidth, optical fiber between two fiber gratings forms optical fiber FBGF-P chamber, at the both sides placement two panels magnetostriction sheet of the skeleton that quartz glass is made, outside two magnetostriction sheets, winding optical fiber forms an optical fiber endless belt, and optical fiber endless belt is pasted together by bonding agent and magnetostriction sheet.
Fibre Optical Sensor light source adopts semiconductor light sources.
The invention has the beneficial effects as follows: the present invention can carry out magnetic orientation well logging under the rugged surroundings such as high temperature, high pressure, strong electromagnetic, by optical fiber FBGF-P chamber magnetic susceptibility structure in the long change of magnetic fields cavity of resorption, combined high precision phase of light wave signal receiving, accurately measure magnetic field size and realize down-hole box cupling and accurately locate, good stability.
Accompanying drawing illustrates:
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of optical fiber FBGF-P magnetic susceptibility sensor.
Embodiment:
As shown in Figure 1 and Figure 2, a kind of magnetic orientation well logging apparatus based on fiber optic weak magnetic field sensing, comprises Fibre Optical Sensor light source 1, Polarization Controller 2 and embedded type CPU processor 6; Fibre Optical Sensor light source 1, Polarization Controller 2, optical fiber circulator 10, optical fiber FBGF-P magnetic susceptibility sensor 11 connect in turn, optical fiber circulator 10 is connected with fiber coupler 9, fiber coupler 9 is connected with faraday rotation mirror I 3, phase-modulator 5, photodetector 8 respectively, phase-modulator 5 is connected with faraday rotation mirror II 4, and photodetector 8, A/D data collecting card 7, embedded type CPU processor 6 connect in turn; Optical fiber FBGF-P magnetic susceptibility sensor 11 comprises an optical fiber 16, on optical fiber 16, interval certain length inscribes two consistent fiber gratings of reflection kernel wavelength, reflectivity and reflection spectrum bandwidth, optical fiber between two fiber gratings forms optical fiber FBGF-P chamber, at the both sides placement two panels magnetostriction sheet 15 of the skeleton 12 that quartz glass is made, outside two magnetostriction sheets 15, winding optical fiber 16 forms an optical fiber endless belt 14, and optical fiber endless belt 14 is pasted together by bonding agent 13 and magnetostriction sheet 15.Magnetostriction sheet 15 is when its surrounding magnetic field state changes, and macroscopically shows as the subtle change of size or volume, and only makes the material of pressure and temperature-insensitive magnetic-field-sensitive.Fibre Optical Sensor light source 1 adopts semiconductor light sources.The stability of light source output power is very large on measuring accuracy impact, for ensureing that the degree of accuracy measured must stability in use light source.
During use, the light that Fibre Optical Sensor light source 1 emits is delivered in optical fiber FBGF-P magnetic susceptibility sensor 11 through optical fiber circulator 10 after Polarization Controller 2 carries out polarization state adjustment, at any time, two gratings in optical fiber FBGF-P magnetic susceptibility sensor 11 are respectively to back reflection two groups of light beams, enter in fiber coupler 9 through optical fiber circulator 10, the two-beam entering fiber coupler 9 enters faraday rotation mirror I 3 and phase-modulator 5 respectively, faraday rotation mirror II 4, enter after faraday rotation mirror I 3 reflects and get back to fiber coupler 9, enter after phase-modulator 5 is modulated and again modulated by phase-modulator 5 through faraday rotation mirror II 4 reflection, finally get back to fiber coupler 9, get back to fiber coupler 9 light wave some meet interference condition and interfere at fiber coupler 9 place, when external magnetic field intensity changes, because magnetic material magnetostrictive effect is to the stretching action of optical fiber, light path between two light beams changes, the final phase place that shows as in interference effect changes.The interference light signal at fiber coupler 9 place is converted into electric signal by photodetector 8, analog electrical signal is converted to digital signal through A/D in A/D data collecting card 7, finally send into embedded type CPU processor 6 and carry out signal transacting, result is by being tested changes of magnetic field situation.
Be understandable that, above about specific descriptions of the present invention, the technical scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.
Claims (2)
1., based on a magnetic orientation well logging apparatus for fiber optic weak magnetic field sensing, comprise Fibre Optical Sensor light source (1), Polarization Controller (2) and embedded type CPU processor (6), it is characterized in that: Fibre Optical Sensor light source (1), Polarization Controller (2), optical fiber circulator (10), optical fiber FBGF-P magnetic susceptibility sensor (11) connects in turn, optical fiber circulator (10) is connected with fiber coupler (9), fiber coupler (9) respectively with faraday rotation mirror I (3), phase-modulator (5), photodetector (8) is connected, phase-modulator (5) is connected with faraday rotation mirror II (4), photodetector (8), A/D data collecting card (7), embedded type CPU processor (6) connects in turn, optical fiber FBGF-P magnetic susceptibility sensor (11) comprises an optical fiber (16), at optical fiber (16) upper interval, certain length inscribes reflection kernel wavelength, reflectivity and consistent two fiber gratings of reflection spectrum bandwidth, optical fiber between two fiber gratings forms optical fiber FBGF-P chamber, in both sides placement two panels magnetostriction sheet (15) of the skeleton (12) that quartz glass is made, an optical fiber endless belt (14) is formed two magnetostriction sheets (15) outside winding optical fiber (16), optical fiber endless belt (14) is pasted together by bonding agent (13) and magnetostriction sheet (15).
2. according to the magnetic orientation well logging apparatus based on fiber optic weak magnetic field sensing according to claim 1, it is characterized in that: described Fibre Optical Sensor light source (1) adopts semiconductor light sources.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510685801.0A CN105388433A (en) | 2015-10-20 | 2015-10-20 | Magnetic localization logging device based on optical fiber weak magnetic field sensing |
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| CN201510685801.0A CN105388433A (en) | 2015-10-20 | 2015-10-20 | Magnetic localization logging device based on optical fiber weak magnetic field sensing |
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| CN105388433A true CN105388433A (en) | 2016-03-09 |
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Citations (6)
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| CN101598773A (en) * | 2009-07-02 | 2009-12-09 | 西北工业大学 | A kind of magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof |
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| CN103528665A (en) * | 2013-09-29 | 2014-01-22 | 中国电子科技集团公司第二十七研究所 | Novel Fabry-Perot interference MEMS (Micro Electro Mechanical System) sound wave sensor |
| CN103926541A (en) * | 2014-05-06 | 2014-07-16 | 天津理工大学 | Magnetic field measurement device based on Sagnac interferometer |
| EP2860540A1 (en) * | 2013-10-14 | 2015-04-15 | Siemens Aktiengesellschaft | Magnetic sensor arrangement |
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2015
- 2015-10-20 CN CN201510685801.0A patent/CN105388433A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598773A (en) * | 2009-07-02 | 2009-12-09 | 西北工业大学 | A kind of magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof |
| CN102221697A (en) * | 2011-03-25 | 2011-10-19 | 电子科技大学 | Airborne multi-antenna SAR chromatography three dimensional imaging system and imaging method thereof |
| CN102221679A (en) * | 2011-04-25 | 2011-10-19 | 东北大学 | Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor |
| CN103528665A (en) * | 2013-09-29 | 2014-01-22 | 中国电子科技集团公司第二十七研究所 | Novel Fabry-Perot interference MEMS (Micro Electro Mechanical System) sound wave sensor |
| EP2860540A1 (en) * | 2013-10-14 | 2015-04-15 | Siemens Aktiengesellschaft | Magnetic sensor arrangement |
| CN103926541A (en) * | 2014-05-06 | 2014-07-16 | 天津理工大学 | Magnetic field measurement device based on Sagnac interferometer |
Non-Patent Citations (1)
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| 朱秀英 等: "基于FBG F-P的全光纤井下声波传感器", 《测井技术》 * |
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