CN103926541A - Magnetic field measurement device based on Sagnac interferometer - Google Patents
Magnetic field measurement device based on Sagnac interferometer Download PDFInfo
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- CN103926541A CN103926541A CN201410188531.8A CN201410188531A CN103926541A CN 103926541 A CN103926541 A CN 103926541A CN 201410188531 A CN201410188531 A CN 201410188531A CN 103926541 A CN103926541 A CN 103926541A
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Abstract
The invention discloses a magnetic field measurement device based on a Sagnac interferometer. The magnetic field measurement device comprises a light source, a 2*2 optical fiber coupler, a magnetic field sensing probe, an optical spectrum analyzer and a single mode fiber, wherein one end of the magnetic field sensing probe is connected with one port of the 2*2 optical fiber coupler through the single mode fiber, the other end of the magnetic field sensing probe is connected with the other port, on the same side with the port connected with the magnetic field sensing probe, of the 2*2 optical fiber coupler through the single mode fiber, a Sagnac ring structure is formed, and two ports on the other side of the 2*2 optical fiber coupler are connected with the light source and the optical spectrum analyzer respectively. Light given out by the 2*2 optical fiber coupler is divided into two beams of light, the two beams of light are transmitted in opposite directions, the phase difference between the two beams of light is sensitive to changes of an external magnetic field, changes of a Sagnac output spectrum of an optical fiber are caused by changes of the external magnetic field through interference of a Sagnac output end, and sensing measurement of magnetic field intensity can be achieved through measurement of changes of the output spectrum. The conical coreless optical fiber and a film are adopted for the magnetic field sensing probe, and in the range interval, the magnetic field sensing probe has the advantages of being high in linearity and sensitivity, simple, exquisite and the like.
Description
Technical field
The present invention relates to optical fiber communication and sensory field of optic fibre, be specifically related to a kind of magnetic field measuring device based on Sagnac interferometer, be mainly used in optical fiber communication and sensory field of optic fibre.
Background technology
All there is magnetic field or the information relevant to magnetic field with natural many fields in human society life.There is now the magnetic field of the artificial permanent magnet generation arranging of many utilizations as the device of information carrier.Therefore, the various information of carrying for surveying, gather, in storage, conversion, reproduction and monitoring magnetic field and magnetic field, magnetic-field measurement is very important part in Techniques in Electromagnetic Measurement.Previous magnetic field sensor, mostly becomes Magnetic Field into electric signal and measures.But along with the develop rapidly of information industry, industrial automation, communications and transportation, Power Electronic Technique, office automation, household electrical appliance, Medical Instruments etc., traditional magnetic field sensor exists and is easily subject to electromagnetic interference (EMI), is subject to the shortcomings such as environmental corrosion, is restricted in actual applications.
Optical fiber sensing technology is taking light wave as carrier, and optical fiber is medium, the New Sensing Technology of perception and transmission outer signals (measured).As the light wave of measured signal carrier with as the optical fiber of light wave propagation medium, have advantages of that other carriers of a series of uniquenesses are difficult to compare with medium.Light wave is not afraid of electromagnetic interference (EMI), is easily that various light-detecting devices receive, and can carry out easily photoelectricity or electric light conversion, and optical fiber modern electronics and computing machine easy and high development match.As sensor, compared with traditional sensor, Fibre Optical Sensor has advantages of a series of uniquenesses, and as large in highly sensitive, the good flexibility of optical fiber and toughness, responding range, bandwidth, anti-electromagnetic interference (EMI), corrosion-resistant, explosion-proof, anti-flaming, loss is low, be easy to realize the advantages such as telemeasurement.Now the existing magnetic field sensor based on utilizing magnetic fluid clad optical fiber grating to form the optical fiber technologies such as magnetic field sensor is in the news, and this sensor utilizes the mangneto variable refractive index phenomenon of magnetic fluid, realizes magnetic field sensing by the phase place that changes transmission light.But these fiber gratings to write process processed cumbersome, need special and expensive equipment, sensitivity is not very high, and these fiber gratings are easily subject to the isoparametric impact of temperature in environment.Material and architecture advances so need a person with the qualifications of a general, with the interference that improves sensitivity and remove environment temperature parameter.
Summary of the invention
The object of the invention is to solve existing fiber grating sensor, to make trouble cost high and sensitivity is low and be subject to the problems such as temperature disturbance, provide a kind of simple in structure, highly sensitive, cost is low, can remove the magnetic field measuring device based on Sagnac interferometer of the features such as temperature disturbance.
Magnetic field measuring device based on Sagnac interferometer provided by the invention comprises light source, 2 × 2 fiber couplers, magnetic field sensing probe, spectroanalysis instrument, single-mode fiber.One end of described magnetic field sensing probe is connected with a port of 2 × 2 fiber couplers by single-mode fiber, the other end of magnetic field sensing probe is connected with another port of 2 × 2 fiber coupler the same sides by single-mode fiber, form Sagnac ring structure, two ports of 2 × 2 fiber coupler opposite sides are connected with light source and spectroanalysis instrument respectively.It is characterized in that:
Described magnetic field sensing probe segment comprises the film that taper coreless fiber and arc discharge form, the left end of taper coreless fiber be connected magnetic field sensing probe one end and have the single-mode fiber welding of film, the right-hand member of taper coreless fiber is directly connected with single-mode fiber, utilize heat sealing machine first the single-mode fiber end face arc discharge of well cutting to be formed to film, then one end is had to single-mode fiber and the welding of taper coreless fiber of film, between taper coreless fiber and single-mode fiber, embedded film like this.Described taper coreless fiber and the part single-mode fiber at two ends are placed in glass capillary, pour into magnetic fluid in glass capillary, and the port of living glass capillary two ends by light chemosetting rubber seal, form magnetic field sensing probe.
Described taper coreless fiber is also to discharge and form on heat sealing machine, and coreless fiber length is 1.5-2.5cm, and the waist diameter in cone district is 40-80 μ m.
Described glass capillary diameter is 300 μ m.
The principle of work of the magnetic field measuring device based on Sagnac interferometer that the present invention makes:
The light being sent by light source is divided into the two-beam of transmission in opposite directions by 2 × 2 fiber couplers, along clockwise and counterclockwise transmission in optical fiber Sagnac ring, propagates after one week in the outgoing of fiber coupler output port in fiber optic loop respectively.Due to the effect of film, a part of light can reflect, and another part light continues to propagate, and phase differential can occur the light that therefore two bundle reverse directions are propagated, and its value is:
φ＝2πΔnL/λ
Wherein Δ n is that the effective refractive index of two parts light is poor, and L is the path length difference of two parts light, the wavelength that λ is incident light wave.Two-beam can produce interference in the time that the coupling of 2 × 2 fiber couplers merges again, forms the interference spectum that intensity wavelength is periodic distribution, and the intensity of interference spectum and the relation of phase differential are as follows:
I∝1+cosφ
When magnetic field sensing probe is during in different magnetic field intensity, because the refractive index of magnetic fluid is to residing magnetic-field-sensitive, so magnetic field can change the optical path difference of two parts light by magnetic fluid, known according to above-mentioned formula, the crest of interference spectum or wave trough position can change, the variable quantity producing with changes of magnetic field by monitoring certain crest or trough, can demodulate the change information of magnetic field intensity, because the present invention's application is coreless fiber, it is not high to temperature sensitivity, so this structure is also insensitive to temperature.
Advantage of the present invention and beneficial effect:
The present invention, by the film that utilizes taper coreless fiber and welding electric discharge to form, has realized the measurement to magnetic field, and magnetic field sensing probe provided by the invention possesses the good linearity, high sensitivity, the advantage such as simple small and exquisite in scope interval.
Brief description of the drawings
Fig. 1 is the structural representation of the magnetic field measuring device based on Sagnac interferometer in the present invention;
Fig. 2 is the structural representation of magnetic field sensing probe in the present invention;
In figure: 1. light source, 2.2 × 2 fiber couplers, 3. magnetic field sensing probe, 4. spectroanalysis instrument, 5. single-mode fiber, 6. taper coreless fiber, 7. film, 8. magnetic fluid, 9. optics solidifies glue, 10. glass capillary.
Embodiment
For objects and advantages of the present invention are described better, below in conjunction with accompanying drawing and example, the invention will be further described.
Embodiment 1
As shown in Figure 1, the magnetic field measuring device based on Sagnac interferometer provided by the invention, comprises light source 1,2 × 2 fiber couplers 2, magnetic field sensing probe 3, spectroanalysis instrument 4, single-mode fiber 5.One end of magnetic field sensing probe 3 is connected with a port of 2 × 2 fiber couplers 2 by single-mode fiber 5, the other end of magnetic field sensing probe 3 is connected with another port of 2 × 2 fiber coupler 2 the same sides by single-mode fiber 5, form Sagnac ring structure, two ports of 2 × 2 fiber coupler 2 opposite sides are connected with light source 1 and spectroanalysis instrument 4 respectively.
In Fig. 2, described magnetic field sensing probe 3 comprises the film 7 that taper coreless fiber 6 and arc discharge form, the left end of taper coreless fiber be connected magnetic field sensing 3 one end of popping one's head in and have single-mode fiber 5 weldings of film 7, the right-hand member of taper coreless fiber is directly connected with single-mode fiber 5; Utilize heat sealing machine first the single-mode fiber end face arc discharge of well cutting to be formed to film 7, then one end is had to single-mode fiber 5 and 6 weldings of taper coreless fiber of film 7, between taper coreless fiber 6 and single-mode fiber 5, embedded film 7 like this.The effect of film 7 is that a part of light is reflected back, and the light transmission of another part continues to propagate.Described taper coreless fiber 6 is also to discharge and form on heat sealing machine, it is in 300 μ m glass capillaries 10 that described taper coreless fiber and the part single-mode fiber at two ends are placed on diameter, in glass capillary, pour into magnetic fluid 8, and seal the port at glass capillary 10 two ends with light chemosetting glue 9, form magnetic field sensing probe 3.
When magnetic field sensing probe is during in different magnetic field intensity, because the refractive index of magnetic fluid 8 is to residing magnetic-field-sensitive, so magnetic field can change the optical path difference of two parts light by magnetic fluid 8, the crest of interference spectum or wave trough position can change, by monitoring certain crest or the trough variable quantity with changes of magnetic field generation, can demodulate the change information of magnetic field intensity.
Coreless fiber in this example is to make for pure quartz, and length is 2cm.Diameter is 125 μ m, and the waist diameter in cone district is 55 μ m, and magnetic fluid is the water-based magnetic fluid (EMG605) that Ferrotec company produces, and the internal diameter of glass capillary is 300 μ m.It is in 300 μ m glass capillaries 10 that the part single-mode fiber at taper coreless fiber and two ends is placed on diameter, after magnetic fluid 8 being injected to kapillary 10 and its two ends light chemosetting glue 9 being sealed, glass capillary 8 is placed among magnetic field.In the time that external magnetic field becomes large, find that blue shift appears in transmission peaks wavelength, within the scope of 50-175Oe, the size in transmission peaks wavelength location and magnetic field is linear.Obtaining sensitivity is 30pm/Oe.And when extraneous magnetic field reaches while being greater than 225Oe, the position of transmission peaks wavelength almost no longer changes.
After suitable calibration, just can measure the magnetic field in circumstances not known, magnetic field measuring device provided by the invention possesses the good linearity, high sensitivity, the advantage such as simple small and exquisite in scope interval.
Claims (4)
1. the magnetic field measuring device based on Sagnac interferometer, is characterized in that this device comprises light source, 2 × 2 fiber couplers, magnetic field sensing probe, spectroanalysis instrument and single-mode fiber; One end of described magnetic field sensing probe is connected with a port of 2 × 2 fiber couplers by single-mode fiber, the other end of magnetic field sensing probe is connected with another port of 2 × 2 fiber coupler the same sides by single-mode fiber, form Sagnac ring structure, two ports of 2 × 2 fiber coupler opposite sides are connected with light source and spectroanalysis instrument respectively.
2. magnetic field measuring device according to claim 1, it is characterized in that: described magnetic field sensing probe segment comprises taper coreless fiber and film, the left end of taper coreless fiber be connected magnetic field sensing probe one end and have the single-mode fiber welding of film, the right-hand member of taper coreless fiber is directly connected with single-mode fiber; Utilize heat sealing machine first the single-mode fiber end face arc discharge of well cutting to be formed to film, then one end is had to single-mode fiber and the welding of taper coreless fiber of film, between taper coreless fiber and single-mode fiber, embedded film like this; Described taper coreless fiber and the part single-mode fiber at two ends are placed in glass capillary, pour into magnetic fluid in glass capillary, and the port of living glass capillary two ends by light chemosetting rubber seal, form magnetic field sensing probe.
3. magnetic field measuring device according to claim 1 and 2, is characterized in that: described taper coreless fiber is also to discharge and form on heat sealing machine, and coreless fiber length is 1.5-2.5cm, and the waist diameter in cone district is 40-80 μ m.
4. magnetic field measuring device according to claim 1 and 2, is characterized in that: described glass capillary diameter is 300 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410188531.8A CN103926541B (en) | 2014-05-06 | magnetic field measuring device based on Sagnac interferometer |
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| CN201410188531.8A CN103926541B (en) | 2014-05-06 | magnetic field measuring device based on Sagnac interferometer |
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| CN103926541A true CN103926541A (en) | 2014-07-16 |
| CN103926541B CN103926541B (en) | 2016-11-30 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105388433A (en) * | 2015-10-20 | 2016-03-09 | 中国石油集团长城钻探工程有限公司 | Magnetic localization logging device based on optical fiber weak magnetic field sensing |
| CN105807238A (en) * | 2016-03-10 | 2016-07-27 | 浙江师范大学 | Weak magnetic field detection system |
| CN105866711A (en) * | 2016-03-22 | 2016-08-17 | 北京信息科技大学 | Method for measuring magnetic field through employing optical fibre Sagnac interferometer |
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
| CN106872912A (en) * | 2015-12-10 | 2017-06-20 | 哈尔滨理工大学 | One kind is based on the remote fibre optic magnetic field sensing device of temperature-compensating high sensitivity |
| CN108051762A (en) * | 2017-12-27 | 2018-05-18 | 北京信息科技大学 | A kind of magnetic field strength transducer and its performance test methods based on FP |
| CN108169919A (en) * | 2018-01-18 | 2018-06-15 | 重庆邮电大学 | A kind of micro-structure mode-locking device and its production technology using conical fiber evanscent field |
| CN108872813A (en) * | 2018-07-04 | 2018-11-23 | 太原理工大学 | A kind of optical fiber pick-up probe device for cable local discharge detection |
| CN109374027A (en) * | 2018-11-30 | 2019-02-22 | 华中科技大学 | A kind of bis- parameter fibre optical sensors of Sagnac based on high birefringence micro-nano fiber |
| CN110579726A (en) * | 2019-10-15 | 2019-12-17 | 哈尔滨理工大学 | Spr-based high-sensitivity magnetic field sensing device |
| CN111121841A (en) * | 2019-11-20 | 2020-05-08 | 桂林电子科技大学 | Michelson optical fiber magnetic field sensing device and method |
| CN111121842A (en) * | 2019-11-20 | 2020-05-08 | 桂林电子科技大学 | Microwave photon magnetic field sensing device and method |
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| US4634977A (en) * | 1982-12-27 | 1987-01-06 | Honeywell Inc. | High accuracy mapping of magnetic fields with a fiber optic interferometer |
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| CN102374874A (en) * | 2011-09-20 | 2012-03-14 | 重庆大学 | Quartz capillary tube embedded all-silica fiber Fabry-Perot interferometric sensor and manufacturing method thereof |
| CN103076575A (en) * | 2012-10-18 | 2013-05-01 | 中国计量学院 | Magnetic field sensor based on magnetic fluid poured polarization-maintaining photonic crystal fiber |
| CN103592495A (en) * | 2013-10-31 | 2014-02-19 | 天津大学 | All optical-fiber current sensor based on magnetic fluid and multi-mode interference and detection method |
Patent Citations (5)
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| US4634977A (en) * | 1982-12-27 | 1987-01-06 | Honeywell Inc. | High accuracy mapping of magnetic fields with a fiber optic interferometer |
| JPH02130489A (en) * | 1988-11-11 | 1990-05-18 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber magnetic field sensor |
| CN102374874A (en) * | 2011-09-20 | 2012-03-14 | 重庆大学 | Quartz capillary tube embedded all-silica fiber Fabry-Perot interferometric sensor and manufacturing method thereof |
| CN103076575A (en) * | 2012-10-18 | 2013-05-01 | 中国计量学院 | Magnetic field sensor based on magnetic fluid poured polarization-maintaining photonic crystal fiber |
| CN103592495A (en) * | 2013-10-31 | 2014-02-19 | 天津大学 | All optical-fiber current sensor based on magnetic fluid and multi-mode interference and detection method |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105388433A (en) * | 2015-10-20 | 2016-03-09 | 中国石油集团长城钻探工程有限公司 | Magnetic localization logging device based on optical fiber weak magnetic field sensing |
| CN106872912A (en) * | 2015-12-10 | 2017-06-20 | 哈尔滨理工大学 | One kind is based on the remote fibre optic magnetic field sensing device of temperature-compensating high sensitivity |
| CN106872912B (en) * | 2015-12-10 | 2023-10-17 | 哈尔滨理工大学 | High-sensitivity long-distance optical fiber magnetic field sensing device based on temperature compensation |
| CN105807238A (en) * | 2016-03-10 | 2016-07-27 | 浙江师范大学 | Weak magnetic field detection system |
| CN105866711A (en) * | 2016-03-22 | 2016-08-17 | 北京信息科技大学 | Method for measuring magnetic field through employing optical fibre Sagnac interferometer |
| CN105866711B (en) * | 2016-03-22 | 2018-06-19 | 北京信息科技大学 | A kind of method that magnetic field is measured using optical fiber sagnac interferometer |
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
| CN108051762A (en) * | 2017-12-27 | 2018-05-18 | 北京信息科技大学 | A kind of magnetic field strength transducer and its performance test methods based on FP |
| CN108169919B (en) * | 2018-01-18 | 2020-03-17 | 重庆邮电大学 | Microstructure mode locking device using conical optical fiber evanescent field and production process thereof |
| CN108169919A (en) * | 2018-01-18 | 2018-06-15 | 重庆邮电大学 | A kind of micro-structure mode-locking device and its production technology using conical fiber evanscent field |
| CN108872813A (en) * | 2018-07-04 | 2018-11-23 | 太原理工大学 | A kind of optical fiber pick-up probe device for cable local discharge detection |
| CN108872813B (en) * | 2018-07-04 | 2020-12-15 | 太原理工大学 | Optical fiber pickup probe device for cable partial discharge detection |
| CN109374027A (en) * | 2018-11-30 | 2019-02-22 | 华中科技大学 | A kind of bis- parameter fibre optical sensors of Sagnac based on high birefringence micro-nano fiber |
| CN110579726A (en) * | 2019-10-15 | 2019-12-17 | 哈尔滨理工大学 | Spr-based high-sensitivity magnetic field sensing device |
| CN111121841A (en) * | 2019-11-20 | 2020-05-08 | 桂林电子科技大学 | Michelson optical fiber magnetic field sensing device and method |
| CN111121842A (en) * | 2019-11-20 | 2020-05-08 | 桂林电子科技大学 | Microwave photon magnetic field sensing device and method |
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