CN102183735A - Space magnetic field detector - Google Patents
Space magnetic field detector Download PDFInfo
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- CN102183735A CN102183735A CN2011100534306A CN201110053430A CN102183735A CN 102183735 A CN102183735 A CN 102183735A CN 2011100534306 A CN2011100534306 A CN 2011100534306A CN 201110053430 A CN201110053430 A CN 201110053430A CN 102183735 A CN102183735 A CN 102183735A
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Abstract
The invention discloses a space magnetic field detector which comprises a broadband laser source, an isolator, a wideband band-pass filter, a 1*3 light beam splitter, three magnetic field detection probes, three photodetectors, three amplifiers, and a set of computer system for processing a signal; each magnetic field detection probe is composed of a normal single-mode fiber, a polarizer, two gradient variable-refractive index lenses and a magneto-optical crystal which are arranged at an input end, and a normal single-mode fiber with an inclined long-period grating at an output end; every two of three magnetic field detection probes are vertical to each other, and each probe can be used for detecting an axial positive and negative direction and strength of corresponding space magnetic field, thereby detecting the magnetic field strength and direction at any point in the space. The space magnetic field detector has the advantages of electromagnetic interference resistance, high precision and high sensitive.
Description
Technical field
The present invention relates to sensory field of optic fibre, relate in particular to a kind of space magnetic field detector.
Background technology
Fiber grating is a kind of novel optical passive component that grows up the nineties, it is the index distribution of a kind of space periodicity of setting up in optical fiber, can change and control the dissemination of light in optical fiber, have insert little, the anti-electromagnetic interference (EMI) of loss, corrosion-resistant, volume is little, in light weight, cost is low and advantage such as easy of integration, now has been widely used in fields such as optical fiber communication and Fibre Optical Sensor.Long period fiber grating is meant longer than the common Bragg grating cycle a kind of optical fibre device of cycle of grating far away, can reach the hundreds of micron.The optical property of long period fiber grating then is based on the coupling of the resonance between the pattern in the same way of satisfying phase-matching condition in the optical fiber, the inclination long period fiber grating then be in optical fiber, write with fiber axis to the long-period gratings that forms an angle, and angle generally greater than 60 the degree angles.The inclination long period fiber grating is when having the characteristic of long period fiber grating, can also make long wavelength's one side of inclination long period fiber grating each transmission peaks in common long period fiber grating transmission spectrum produce a new transmission peak value the coupling light to covering and give off covering of some specific wavelength.The peak of this new generation is brought by the angle of inclination, and the researchist finds that this transmission peaks has extremely strong polarization dependency characteristic.The luminous power that just can detect through the inclination long period fiber grating when the linear polarization polarization surface of being transmitted in the optical fiber deflects changes.Therefore, utilize the magnetic opticity characteristic of this characteristic of inclination long period fiber grating and magneto-optical crystal just can realize detection to space magnetic field intensity.
Summary of the invention
The object of the present invention is to provide a kind of space magnetic field detector, based on the present invention, magnetic field intensity that can the implementation space any point and direction to detection.
On the one hand, the invention discloses a kind of space magnetic field detector, comprise wide range LASER Light Source, isolator, broadband band-pass filter, 1 * 3 beam splitter, three magnetic field detection probes, three photo-detectors, three Amplifier And Computer systems; Wherein, described wide range LASER Light Source, described isolator, described broadband band-pass filter and described 1 * 3 beam splitter are linked in sequence successively by single-mode fiber; And the axis of described three magnetic field detection probe is vertical mutually in twos, is used to detect space magnetic field correspondence self axial positive and negative direction and intensity; The input end of described each magnetic field detection probe is connected with three output ports of described 1 * 3 beam splitter respectively; The output terminal of described each magnetic field detection probe is linked in sequence by circuit and described photo-detector, amplifier and described computer system; And described three photo-detectors enter computer system through the amplifier amplifying signal again after the luminous power that detects the output of three magnetic field detection probes respectively.
Above-mentioned space magnetic field detector, preferred described magnetic field detection probe comprises: the single-mode fiber of Lian Jieing, gradient variable index lens, the polarizer, magneto-optical crystal, gradient variable index lens and write the optical fiber that is shaped on the inclination long-period gratings successively; Described polarizer output polarization polarization surface and the described xsect of writing the optical fiber that is shaped on the inclination long-period gratings have an intersecting lens; When polarized light rotated by magneto-optical crystal, the intersection that the xsect of plane of polarization and optical fiber produces also rotated; In the rotary course of intersection, the periodically-varied of luminous power can take place in inclination long period fiber grating output terminal, intersection with Output optical power when very big is decided to be first intersection, and the intersection with output power when minimum is located second intersection, and first intersection intersects with second intersection and be vertical mutually; When not having magnetic field to pass through magneto-optical crystal, the described polarizer produces the polarization polarization surface and cross section of optic fibre produces the 3rd intersection; Described the 3rd intersection and the first intersection angle are 45 degree, and the angle of described the 3rd intersection and described second intersection is 45 degree.
Among the present invention, three magnetic field detection probe is vertical mutually in twos, and each probe can both magnetic field, implementation space correspondence in himself the axial positive and negative direction and the detection of intensity, thereby the magnetic field intensity of implementation space any point and direction to detection.And the present invention has anti-electromagnetic interference (EMI), high precision, highly sensitive advantage.
Description of drawings
Fig. 1 is the general structure synoptic diagram of space magnetic field detector embodiment of the present invention;
In Fig. 2 one embodiment of the invention, the structural representation of magnetic field detection probe;
Fig. 3 transmission spectrum synoptic diagram of incident polarization polarization surface under two kinds of situations of 0 degree and 90 degree in the long period fiber grating that tilt;
Among the figure, 101-wide range LASER Light Source; The 102-isolator, 103-broadband band-pass filter, 104-1 * 3 beam splitters, 105-magnetic field detection probe, 106-photo-detector, 107-amplifier, 108-computer system; 201-magneto-optical crystal, 202-gradient variable index lens, the 203-polarizer, 204-have been write the general single mode fiber of system long period blazed fiber bragg grating, 205-general single mode fiber.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, in the present embodiment space magnetic field detector, comprise: a wide range LASER Light Source 101,103, one 1 * 3 beam splitters 104 of 102, one broadband band-pass filters of an isolator, three magnetic field detection probes 105, the computer system 108 of 106, three amplifiers of three photo-detectors, 107, one cover processing signals.Wide range LASER Light Source 101, isolator 102 connects by general single mode fiber between broadband band-pass filter 103,1 * 3 beam splitters 104, and the input end of three magnetic field detection probes 105 is connected with three output ports of 1 * 3 beam splitter 104 respectively.The output terminal of each magnetic field detection probe 105 is linked in sequence by circuit and described photo-detector 106, amplifier 107 and described computer system 108.
Wherein, wide range LASER Light Source 101 is for providing the light source of required bandwidth, and the stability of wide spectrum light source has also determined precision and the degree of stability that described whole detection system detects.Isolator 102 input ends are connected with described wide spectrum light source output terminal, make described wide spectrum light source not be subjected to the retroreflection of light path in the described system and the influence of scattered light, can stably work when surveying magnetic field intensity.Broadband band-pass filter 103 input ends are connected with described isolator output terminal, can have only the needed frequency band of described magnetic field detection probe medium dip long period fiber grating to pass through the light filtering of described system unwanted frequency.Beam splitter 104 input ends are connected with described broadband filter output terminal, will import light light and be divided into 3 parts and export from output terminal.
Magnetic field detection probe 105 201, two gradient variable index lens 202 of 205, magneto-optical crystals of general single mode fiber by input end, the polarizer 203, the general single mode fiber 204 that is shaped on the inclination long-period gratings of writing of output terminal constitutes.Concrete, magnetic field detection probe 105 general single mode fibers 205 by input end directly are connected with a gradient variable index lens 202, place the polarizer 203 then successively, magneto-optical crystal 201, gradient variable index lens 202, the optical fiber 204 that is shaped on the inclination long-period gratings of writing of output terminal directly is connected with a last gradient variable index lens 202 of placing.The optical fiber 204 that is shaped on the inclination long-period gratings of writing of output terminal is general single mode fiber.The intersecting lens of polarized light and optical fiber 204 xsects was 45 when the plane of polarization of the polarizer 203 and the polarized light of rotation saw through the power maximum by the inclination long period fiber grating time.Magnetic rotation crystal 2 01 and inclination long period fiber grating make up the perception unit as magnetic field, and represent three coordinate axis of its correspondence in rectangular coordinate system in space respectively with three perception unit.
As can be seen from Figure 1, three photo-detectors 106 enter computer system 108 through amplifier 107 amplifying signals again and handle after the luminous powers that detect 105 outputs of three magnetic field detection probes respectively.Connect by circuit between photo-detector 106, amplifier 107, the computer system 108.
It is emphasized that in the present embodiment three magnetic field detection probe 105 is axially vertical mutually in twos, x axle, y axle, z axle in can corresponding rectangular coordinate system.
The researchist finds in to inclination Study on Long Period Fiber Grating process, in the linear polarization polarization surface rotary course that transmits in the inclination long period fiber grating, in the variation of the luminous power of the light of specific band at the output terminal generating period, intersection with Output optical power when very big is decided to be first intersection, intersection with output power when minimum is located second intersection, and known first intersection is vertical mutually with second intersection.Because first intersection and second intersection are vertical mutually and intersect, then described first intersection and second intersection can be corresponded to x ' and y ' in the plane right-angle coordinate.Power do not occur seeing through with increasing with the phenomenon that subtracts when guaranteeing that plane of polarization at linearly polarized light takes place clockwise with deflection counterclockwise in magneto-optical crystal, the x ' axle in polarization polarization surface that the polarizer in the native system produces and above-mentioned x ', the y ' plane right-angle coordinate is miter angle.At this moment, in the magneto-optical crystal of space magnetic field correspondence in any one magnetic field detection probe, judge the magnetic direction correspondence in the axial positive and negative direction of magneto-optical crystal by the increase and decrease that sees through power, the increase and decrease amount of power judges that the magnetic field correspondence is in the axial intensity of magneto-optical crystal.The change amount of the value of corresponding respectively x axle, y axle, the z axle in rectangular coordinate system of the orthogonal in twos magnetic field detection probe of received three of comprehensive three photodetectors with change size and the direction that direction can calculate space magnetic field by the described computer system of native system.
That is to say, in the present embodiment, photo-detector 106 when receiving magnetic field detection and pop one's head in 105 Output optical power the increasing of income value, subtract obtain corresponding in described each detection probe axial positive and negative of magneto-optical crystal 201, also promptly obtain the positive and negative direction of place axle in the respective coordinates system; Gained optical power change value can obtain the intensity of space magnetic field correspondence in magneto-optical crystal 201 when photo-detector 106 was popped one's head in 105 Output optical power in the reception magnetic field detection.Computer system 108 receive simultaneously three magnetic field detection pop one's head in 105 given be respectively with rectangular coordinate system in x axle, y axle, z axis information and process after, can obtain the intensity and the direction in magnetic field in the space.Particularly, computer system is judged the magnetic direction correspondence in the axial positive and negative direction of magneto-optical crystal by the increase and decrease that sees through power, and the increase and decrease amount of power judges that the magnetic field correspondence is in the axial intensity of magneto-optical crystal.
With reference to Fig. 3, Fig. 3 is the transmission spectrum synoptic diagram of incident polarization polarization surface in the inclination long period fiber grating under two kinds of situations of 0 degree and 90 degree.A represents that plane of polarization is the transmission spectrum of 0 degree, and b represents that respectively plane of polarization is 90 transmission spectrums when spending.Fig. 3 shows, when polarized light transmits in the inclination long period fiber grating, can obtain the polarization polarization surface anglec of rotation by the luminous power of surveying the inclined optical fiber grating output terminal.
More than a kind of space magnetic field detector provided by the present invention is described in detail, used specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change.To sum up, this description should not be construed as limitation of the present invention.
Claims (2)
1. a space magnetic field detector is characterized in that,
Comprise wide range LASER Light Source (101), isolator (102), broadband band-pass filter (103), 1 * 3 beam splitter (104), three magnetic field detection probes (105), three photo-detectors (106), three amplifiers (107) and computer system (108); Wherein,
Described wide range LASER Light Source (101), described isolator (102), described broadband band-pass filter (103) and described 1 * 3 beam splitter (104) are linked in sequence successively by single-mode fiber; And,
The axis of described three magnetic field detection probes (105) is vertical mutually in twos, is used to detect space magnetic field correspondence self axial positive and negative direction and intensity; The input end of described each magnetic field detection probe (105) is connected with three output ports of described 1 * 3 beam splitter (104) respectively; The output terminal of described each magnetic field detection probe (105) is linked in sequence by circuit and described photo-detector (106), amplifier (107) and described computer system (108); And
Described three photo-detectors (106) pass through amplifier (107) amplifying signal again and enter computer system (108) after the luminous power that detects three magnetic field detection probes (105) output respectively.
2. space magnetic field detector according to claim 1 is characterized in that,
Described magnetic field detection probe (105) comprising: the single-mode fiber of Lian Jieing (205), gradient variable index lens (202), the polarizer (203), magneto-optical crystal (201), gradient variable index lens (202) and write the optical fiber (204) that is shaped on the inclination long-period gratings successively;
The described polarizer (203) output polarization polarization surface and the described xsect of writing the optical fiber (204) that is shaped on the inclination long-period gratings have an intersecting lens; When polarized light by magneto-optical crystal (201) when rotating, the intersection that the xsect of plane of polarization and optical fiber (204) produces also rotates; In the rotary course of intersection, the periodically-varied of luminous power can take place in inclination long period fiber grating output terminal, intersection with Output optical power when very big is decided to be first intersection, and the intersection with output power when minimum is located second intersection, and first intersection intersects with second intersection and be vertical mutually;
When not having magnetic field to pass through magneto-optical crystal, the described polarizer (203) the polarization polarization surface that produces and optical fiber (204) xsect produce the 3rd intersection;
Described the 3rd intersection and the first intersection angle are 45 degree, and the angle of described the 3rd intersection and described second intersection is 45 degree.
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| CN2011100534306A CN102183735A (en) | 2011-03-04 | 2011-03-04 | Space magnetic field detector |
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| CN2011100534306A CN102183735A (en) | 2011-03-04 | 2011-03-04 | Space magnetic field detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941199A (en) * | 2013-01-21 | 2014-07-23 | 精工爱普生株式会社 | Magnetic field measurement apparatus |
| CN104515736A (en) * | 2013-09-30 | 2015-04-15 | 河南师范大学 | Optical fiber polarimeter |
| CN106443519A (en) * | 2016-09-27 | 2017-02-22 | 山东大学 | Measurement system and method for detecting magnetic field intensity using magnetic optical isolator |
| CN107102275A (en) * | 2017-04-06 | 2017-08-29 | 河北大学 | Utilize the device and method in magneto-optic memory technique measurement space magnetic field |
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| US20030133657A1 (en) * | 2001-12-11 | 2003-07-17 | Vladimir Kochergin | Magneto-optical sensing employing phase-shifted transmission bragg gratings |
| CN2651761Y (en) * | 2003-08-06 | 2004-10-27 | 江苏法尔胜技术开发中心 | Sensing head of small polarization analysis magneto-optic magnetic field sensor |
| CN101762795A (en) * | 2009-12-31 | 2010-06-30 | 上海舜宇海逸光电技术有限公司 | Optical fiber magneto-optic detection system and method |
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2011
- 2011-03-04 CN CN2011100534306A patent/CN102183735A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030133657A1 (en) * | 2001-12-11 | 2003-07-17 | Vladimir Kochergin | Magneto-optical sensing employing phase-shifted transmission bragg gratings |
| CN2651761Y (en) * | 2003-08-06 | 2004-10-27 | 江苏法尔胜技术开发中心 | Sensing head of small polarization analysis magneto-optic magnetic field sensor |
| CN101762795A (en) * | 2009-12-31 | 2010-06-30 | 上海舜宇海逸光电技术有限公司 | Optical fiber magneto-optic detection system and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941199A (en) * | 2013-01-21 | 2014-07-23 | 精工爱普生株式会社 | Magnetic field measurement apparatus |
| CN104515736A (en) * | 2013-09-30 | 2015-04-15 | 河南师范大学 | Optical fiber polarimeter |
| CN106443519A (en) * | 2016-09-27 | 2017-02-22 | 山东大学 | Measurement system and method for detecting magnetic field intensity using magnetic optical isolator |
| CN106443519B (en) * | 2016-09-27 | 2019-02-22 | 山东大学 | A kind of measuring system and method using magneto optic isolator detection magnetic field strength |
| CN107102275A (en) * | 2017-04-06 | 2017-08-29 | 河北大学 | Utilize the device and method in magneto-optic memory technique measurement space magnetic field |
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Application publication date: 20110914 |