CN105954689B - A kind of novel Weak magentic-field sensor and detection method based on Ampere force - Google Patents
A kind of novel Weak magentic-field sensor and detection method based on Ampere force Download PDFInfo
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Abstract
The invention discloses a kind of novel Weak magentic-field sensor and detection method based on Ampere force.Two output ends of circulator are connected with 2 × 2 polarization-maintaining fiber couplers and spectroanalysis instrument respectively, 2 × 2 polarization-maintaining fiber coupler output ends are connected with the first polarization maintaining optical fibre, the second polarization maintaining optical fibre respectively, first polarization maintaining optical fibre and the second polarization maintaining optical fibre pass through 90 ° of welding, a part in first polarization maintaining optical fibre is as magnetic field induction area, as in magnetic field induction area the first polarization maintaining optical fibre and powered electrode be bundled together by flexible material, flexible material and powered electrode constitute the structure of induced magnetic field；Powered electrode is generated Ampere force by magnetic fields, and for indirectly-acting in magnetic field induction area, polarization maintaining optical fibre generates stress birfringence, to change interference light phase difference, and then obtains the size in magnetic field.The present invention has many advantages, such as that simple production, high sensitivity, at low cost, structure and manufacture craft are simple, improves the jamproof ability of detectable Weak magentic-field and adverse circumstances.
Description
Technical Field
The invention relates to the field of magnetic field sensing, in particular to a novel weak magnetic field sensor based on ampere force and a detection method.
Background
The magnetic field measurement technology has important application in geological exploration, industrial detection, military guidance, biomedical engineering and daily life. The traditional magnetic field sensing method is limited by a plurality of uses due to problems such as electromagnetic interference and the like, and the optical fiber has unique advantages in the aspect of magnetic field sensing as an intrinsically insulating material, and has the advantages of light volume, small weight, high precision, easiness in forming distributed measurement and the like besides being free of electromagnetic interference.
The polarization maintaining fiber has the characteristics of polarization maintaining and high birefringence, and a Sagnac ring formed by the polarization maintaining fiber has high sensitivity to stress, so that the polarization maintaining fiber is very suitable for a magnetic field/current sensor. However, at present, magnetostrictive materials or magnetic fluids generally used for the action of a magnetic field on a polarization maintaining fiber are complex to manufacture.
Disclosure of Invention
The invention aims to provide a novel weak magnetic field sensor based on ampere force and a detection method thereof aiming at the defects of the prior art. The invention greatly improves the sensitivity and the anti-interference capability of magnetic field sensing by the ampere force of the electrified electrode in the magnetic field, has simple structure and manufacture, and simultaneously ensures the stability of the system by adopting the Sagnac interference system.
The purpose of the invention is realized by the following technical scheme:
a novel weak magnetic field sensor based on ampere force:
the device comprises a light source, a polarizer, a circulator and a spectrum analyzer, wherein the light source is connected with the polarizer, the polarizer is connected with the input end of the circulator, and the device also comprises a 2 multiplied by 2 polarization-maintaining optical fiber coupler, a first polarization-maintaining optical fiber, a second polarization-maintaining optical fiber, a flexible material and a power-on electrode; two output ends of the circulator are respectively connected with one input end of a 2 x 2 polarization-maintaining optical fiber coupler and the spectrum analyzer, the other input end of the 2 x 2 polarization-maintaining optical fiber coupler is vacant, two output ends of the 2 x 2 polarization-maintaining optical fiber coupler are respectively connected with one ends of the first polarization-maintaining optical fiber and the second polarization-maintaining optical fiber, and the other ends of the first polarization-maintaining optical fiber and the second polarization-maintaining optical fiber are welded together through a 90-degree welding point, so that the 2 x 2 polarization-maintaining optical fiber coupler, the first polarization-maintaining optical fiber and the second polarization-maintaining optical fiber form a Sagnac ring; one part of the first polarization maintaining fiber is used as a magnetic field induction area, the part and the electrified electrode are wrapped together through a flexible material, the electrified electrode is connected with a power supply to be electrified, and the flexible material outputting constant current and the electrified electrode form a structure for inducing a magnetic field.
The first polarization maintaining fiber at the magnetic field induction area is uniformly wrapped by a layer of flexible material, and the electrified electrode is wrapped outside the first polarization maintaining fiber by the flexible material and is parallel to the first polarization maintaining fiber. The first polarization maintaining fiber at the magnetic field induction area is an ampere force sensitive area in the induction area of the induction magnetic field.
At a 90-degree welding point, the first polarization maintaining fiber and the second polarization maintaining fiber are mutually connected in a 90-degree rotating mode, so that the fast axis of the first polarization maintaining fiber and the slow axis of the second polarization maintaining fiber are connected, namely the fast axis of the first polarization maintaining fiber is connected with the slow axis of the second polarization maintaining fiber, and the slow axis of the first polarization maintaining fiber is connected with the fast axis of the second polarization maintaining fiber.
By adjusting the polarizer, the polarization direction of the incident light is the main axis direction of the two polarization maintaining optical fibers, and the polarization directions of the two paths of linearly polarized light passing through the 2 x 2 polarization maintaining optical fiber coupler are respectively on the fast axis of one polarization maintaining optical fiber and the slow axis of the other polarization maintaining optical fiber.
Secondly, a novel weak magnetic field detection method based on ampere force:
light generated by a light source is changed into linearly polarized light after passing through a polarizer and is input into a 2 x 2 polarization-maintaining optical fiber coupler through a circulator, two linearly polarized light beams with equal light intensity and 90-degree phase difference are output from the output end of the 2 x 2 polarization-maintaining optical fiber coupler, the two linearly polarized light beams are respectively transmitted through a fast axis and a slow axis in a first polarization-maintaining optical fiber and a second polarization-maintaining optical fiber which form a Sagnac ring and are changed in transmission optical axis through a 90-degree welding point, after being transmitted for a circle in the Sagnac ring, the linearly polarized light beams return to the 2 x 2 polarization-maintaining optical fiber coupler to generate wave combination interference, and the interference light is output to a spectrum analyzer through the circulator to obtain interference data such as interference waveforms; in the transmission process, the electrified electrode generates ampere force under the action of a magnetic field, and indirectly acts on a first polarization maintaining optical fiber in a magnetic field induction area, namely a Sagnac ring formed by two sections of polarization maintaining optical fibers through a flexible material, so that the polarization maintaining optical fibers generate stress birefringence, the phase difference of two paths of interference light of wave combination interference is changed, and the magnitude of the magnetic field is obtained by comparing and analyzing the magnitude of the phase in interference data.
The electrified electrode is deformed under the action of ampere force, and the first polarization maintaining fiber is driven to deform through the flexible material, so that stress birefringence (namely photoelastic effect) is generated in the first polarization maintaining fiber.
Further, when there is no magnetic field in the space, the two polarized lights output from the output end of the 2 × 2 polarization-maintaining fiber coupler are changed in the propagation optical axis at the 90 ° welding point, and since the fast and slow axes of the polarization-maintaining fibers have different refractive indexes, after the two polarized lights are transmitted for one circle in the Sagnac loop, the two polarized lights have different optical paths, and the combined wave interference occurs at the 2 × 2 polarization-maintaining fiber coupler, and is output to the spectrum analyzer via the circulator, and the interference waveform displayed in the spectrum analyzer is observed.
When a magnetic field exists in the space, the refractive indexes of the optical fibers at the position of the 3mm flexible material in the directions of the two main shafts are changed, the optical path difference generated after the two beams of light are transmitted for one circle in the Sagnac ring is changed, the spectral analysis is carried out by the spectral analyzer, the interference images of the two beams of light are compared, the phase difference of the interference light is calculated, and the weak magnetic field in the space can be analyzed, wherein the weak magnetic field is about 10-2A magnetic field of G strength.
Further, the weak magnetic field detection process of the invention comprises the following steps:
(1) adjusting the polarizer to enable the polarization direction to be the main axis direction of the polarization maintaining optical fiber, wherein the splitting ratio of light output after passing through the 2 multiplied by 2 polarization maintaining optical fiber coupler is 1:1, and the specific phase relation is as follows:
where i is an imaginary unit, E1 and E2 represent magnetic fields input from both ends of the 2 × 2 polarization maintaining fiber coupler, and E3 and E4 represent magnetic fields output from both ends of the 2 × 2 polarization maintaining fiber coupler.
E of polarization-maintaining fiber coupler only from 2 x 2 in the invention1One port inputs polarized light. E output from 2X 2 polarization-maintaining fiber coupler3、E4Linearly polarized light with the same amplitude and a phase difference of 0 degrees is obtained.
(2) After two beams of light output from the 2 × 2 polarization-maintaining fiber coupler are transmitted for one circle in the Sagnac loop under the condition of no magnetic field, the combined wave interference occurs at the 2 × 2 polarization-maintaining fiber coupler, and at this time, the optical path difference of the two beams of light is:
△L1＝(nslowl1+nfastl2)-(nfastl1+nslowl2)＝(nslow-nfast)(l1-l2)
wherein n isslowRefractive index, n, representing the slow axis of polarization-maintaining lightfastRefractive index of fast axis of polarization-maintaining light,/, is1Denotes the length of the first polarization maintaining fiber,/2Indicating the length of the second polarization maintaining fiber, △ L1The optical path difference when the two beams of light are subjected to combined wave interference is shown.
Obtaining a phase difference of
Wherein,representing two beams of lightA phase difference when the composite wave interference occurs in the absence of a magnetic field in the sensing region, wherein λ represents the wavelength of light, △ L1The optical path difference when the two beams of light are subjected to combined wave interference is shown.
At this time, the normalized birefringence on the polarization maintaining fiber is:
wherein, BiExpressing the normalized birefringence of the polarization maintaining fiber, △ n expressing the difference between the slow axis index and the fast axis index of the polarization maintaining fiber, λ expressing the wavelength of light, LbIs the beat length between modes, nslowRefractive index, n, representing the slow axis of polarization-maintaining lightfastRepresenting the refractive index of the fast axis of polarization maintaining light.
(3) After the optical fiber is subjected to the action of external force, stress birefringence is generated, the normalized refractive index of the polarization maintaining optical fiber changes, and the relation between the specific change and the force is as follows:
wherein, BeThe birefringence of the optical fiber caused by photoelastic effect after stress is expressed, wherein a is 1.58 and is a constant, and c represents the photoelastic coefficient c is 3.7 multiplied by 10-12m2N, f is the external force applied to the unit length of the optical fiber, N is the refractive index of the polarization maintaining optical fiber, k0Is the wave number in vacuum, d is the outer diameter of the polarization maintaining fiber.
When the resultant refractive index is
Wherein B represents a group represented by BiAnd BeResultant birefringence, α external force and polarization maintaining fiberThe included angle of the slow axis is constant when a is 1.58, and c represents the photoelastic coefficient when c is 3.7 multiplied by 10-12m2/N，BiDenotes the normalized birefringence on the polarization maintaining fiber, BeShowing birefringence due to the photoelastic effect after a force is applied to the fiber.
Two beams of light are applied to the flexible material over a coating length of △ l2The resulting phase difference is:
wherein,the phase difference generated by two beams of light in the sensing area is shown, lambda represents the wavelength of the light, and B represents the phase difference generated by BiAnd BeResultant birefringence, △ l2Representing the length of optical fiber coated with a flexible material.
(4) The total phase difference of the interference light generated by the wave combination interference at the 2 x 2 polarization-maintaining fiber coupler is the sum of the two phase differences, △ l is omitted2N in the rangefastAnd nslowThe influence of (c). Therefore, the total phase difference can be obtained, and the magnetic field intensity can be calculated according to the phase difference.
Wherein,showing the total phase difference when the two beams of light are subjected to wave combination interference,shows the phase difference when the two beams of light have wave combination interference when no magnetic field exists in the induction area,indicating the phase difference between the two beams in the sensing region, λ indicating the wavelength of the light, △ L1△ l representing the optical path difference when the two beams have combined wave interference2Representing the length of optical fiber coated with a flexible material.
(5) In the invention, the current of the direct current power supply is set to be I ampere, and the stress f of the polarization maintaining optical fiber per unit length is Bx*I△l2/△l2＝BxI, setting the electrodes at 45 ° to the slow axis, α ═ 45, the phase shift is related to the magnetic field as follows:
wherein,indicating the phase difference between the two beams in the sensing zone, BiThe normalized birefringence of the polarization maintaining fiber is expressed, a is a constant of 1.58, and c is a photoelastic coefficient of 3.7 × 10-12m2N, f is the external force applied to the unit length of the optical fiber, N is the refractive index of the polarization maintaining optical fiber, k0Is the wave number in vacuum, d is the outer diameter of the polarization maintaining fiber. B isx△ l for weak magnetic field strength2Which indicates the length of the optical fiber coated with the flexible material, and lambda indicates the wavelength of light.
The invention has the beneficial effects that:
by combining the characteristics of the flexible material and the polarization maintaining optical fiber, the sensor provided by the invention greatly improves the sensitivity and the anti-interference capability of magnetic field sensing through the ampere force of the electrified electrode in a magnetic field, and has simple structure and manufacture. Meanwhile, the Sagnac interference system adopted by the invention also ensures the stability of the system.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: the device comprises a light source 1, a polarizer 2, a circulator 3, a spectrum analyzer 4, a 2 multiplied by 2 polarization-maintaining optical fiber coupler 5, a first polarization-maintaining optical fiber 6, a second polarization-maintaining optical fiber 7, a flexible material 8, a powered electrode 9, a 90-degree welding point 10 and a magnetic field induction area 11.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to fig. 1, the overall structure schematic diagram of the novel weak magnetic field sensor of the present invention includes a light source 1, a polarizer 2, a circulator 3, a spectrum analyzer 4, a 2 × 2 polarization-maintaining fiber coupler 5, a first polarization-maintaining fiber 6, a second polarization-maintaining fiber 7, a flexible material 8, and a power-on electrode 9.
After light generated by the light source 1 is polarized by the polarizer 2, a beam of linearly polarized light with a single polarization direction is formed, and the polarization direction of the polarized light is controlled to be consistent with the direction of the main shaft of the polarization-maintaining optical fiber. The polarized light is input to the input end of the 2 multiplied by 2 polarization-maintaining optical fiber coupler through the circulator, and two linearly polarized lights with equal light intensity and 90-degree phase difference are output from the two output ends. Two beams of light are transmitted in a Sagnac ring formed by a first polarization maintaining fiber and a second polarization maintaining fiber, the optical axis of the transmission of the polarization maintaining fiber is changed at the 90-degree point welding position of the polarization maintaining fiber, the light is transmitted on the slow axis or the fast axis from the original light transmitted on the fast axis or the slow axis, the light is transmitted on the slow axis or the fast axis, the two optical fibers are divided into two sections at the welding point, and the length difference of the two sections is 3 m. After two beams of light are transmitted for one circle in the Sagnac ring, wave combination interference occurs at a 2 multiplied by 2 polarization-maintaining optical fiber coupler, and the interference light is output to a spectrum analyzer through a circulator to observe the interference waveform of the interference light; a layer of flexible material with the length of 3mm is uniformly coated on the first polarization maintaining optical fiber, a power-on electrode is wrapped in the flexible material, the ampere force generated by the power-on electrode under the action of a magnetic field indirectly acts on a Sagnac ring formed by two sections of polarization maintaining optical fibers through the flexible material, so that the polarization maintaining optical fibers generate stress birefringence, the phase difference of interference light is changed, and the size of the magnetic field is obtained through calculation of the size of the phase difference.
The light source 1 is an SLD broadband light source, has an operating wavelength of 1310nm, has high output power, high brightness, and high quality, and is used to generate light.
The polarizer 2 is a polarization maintaining optical fiber polarizer, which adopts high birefringence optical fiber, and further increases birefringence in a certain winding mode to cut off one mode. One end of the polarization maintaining optical fiber polarizer uses a connector to align the light output from the polarizer with the slow axis of the polarization maintaining optical fiber.
The circulator 3 is a device for making light circularly transmitted in one direction, and can make light propagate only in a specific direction. Linearly polarized light output from the polarizer 2 can only be output to the 2 x 2 polarization-maintaining optical fiber coupler 5 after passing through the circulator 3, and light output from the reverse output end of the 2 x 2 polarization-maintaining optical fiber coupler 5 can only be output to the spectrum analyzer 4 through the circulator 3.
The spectrum analyzer 4 of the present invention is an interference spectrum analyzer, which can read out a spectrum from a display screen immediately based on received light or output a spectrum from a printer or a plotter, and can observe the state of light based on the spectrum, analyze the phase difference of interference light, and calculate the magnitude of a magnetic field based on the magnitude of the phase difference.
The 2 x 2 polarization-maintaining fiber coupler 5 of the invention is a polarization-maintaining fiber coupler made of polarization-maintaining fiber, which has the functions of dividing light emitted from an incident section into two linearly polarized light beams with the splitting ratio of 1:1 and the phase difference of 90 degrees; two linearly polarized light beams after Sagnac transmits for one circle are combined into a light combination effect that a light beam is emitted from a reverse output end, and meanwhile, the polarization state of the linearly polarized light beams can be kept unchanged.
The Sagnac ring formed by the first polarization maintaining fiber 6 and the second polarization maintaining fiber 7 is characterized in that when the stress on the optical fibers is changed, the length of the optical fibers and the effective refractive indexes of the fiber core and the cladding guided mode are changed, so that the shape and the intensity distribution of a transmission spectrum are changed, and the Sagnac ring has the characteristics of simple structure, high sensitivity, flexibility in adjustment and the like. According to the invention, the polarization-maintaining optical fiber is coated with a flexible material, the flexible material is wrapped with a powered electrode and connected to the Sagnac ring, and then when a magnetic field changes, the change of ampere force is generated, and the stress generated by the optical fiber is changed, so that the refractive index of light is changed.
The flexible material 8 has a high stress coefficient and is capable of sensing weak deformation. The electrified electrode 9 is an electrified nickel electrode, and the ampere force generated by the electrified electrode under the action of a magnetic field indirectly acts on the Sagnac ring formed by the two sections of polarization-maintaining optical fibers through the flexible material 8, so that the polarization-maintaining optical fibers generate stress birefringence, and the phase difference of interference light is changed.
The 90 spot weld 10 of the present invention uses modern technology to 90 spot weld two sections of optical fibers, where the polarization of the light changes as it propagates, i.e., from fast axis/slow axis to slow axis/fast axis.
The specific embodiment and the implementation process of the invention are as follows:
(1) adjusting the polarizer to align the polarization direction of the polarizer with the slow axis of the polarization maintaining fiber, wherein the splitting ratio of light output after passing through the 2 multiplied by 2 polarization maintaining fiber coupler is 1:1, and a phase relation is obtained;
(2) after two beams of light output from the 2 x 2 polarization-maintaining fiber coupler are transmitted for a circle in a Sagnac ring under the condition of no magnetic field, wave combination interference occurs at the 2 x 2 polarization-maintaining fiber coupler, and the optical path difference of the two beams of light is obtained;
normalized birefringence B on polarization maintaining fiberiComprises the following steps:
Bi＝λ/Lb＝1310nm/2.66m＝4.92*10-7
(3) the constant current source is adjusted to be 1A, stress birefringence is generated after the optical fiber is subjected to the action of external force, the normalized refractive index of the polarization maintaining optical fiber changes, and a relation between specific change and force is obtained:
and a resultant refractive index of:
two beams of light are applied to the flexible material over a coating length of △ l2The resulting phase difference is given by:
the spectrum analyzer of the embodiment can only analyze [ 0-2 pi ]]Phase difference in the range, the maximum detectable magnetic field is 1.67 x 10-4G。
(4) The total phase difference of the interference light generated by the wave combination interference at the 2 x 2 polarization-maintaining fiber coupler is the sum of the two phase differences, △ l is omitted2N in the rangefastAnd nslowThe influence of (c). Therefore, the total phase difference can be obtained, and the magnetic field intensity can be obtained through calculation according to the phase difference.
Therefore, the invention realizes the detection of the weak magnetic field by combining the characteristics of the flexible material and the polarization maintaining optical fiber, improves the sensitivity and the anti-interference capability of magnetic field sensing, has good stability and has outstanding technical effects.
The foregoing detailed description is intended to illustrate and not limit the invention, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the invention are intended to be covered by the following claims.
Claims (6)
1. The utility model provides a novel weak magnetic field sensor based on ampere force, includes light source (1), polarizer (2), circulator (3) and spectral analysis appearance (4), and light source (1) links to each other with polarizer (2), and polarizer (2) link to each other its characterized in that with the input of circulator (3): the polarization maintaining optical fiber coupler also comprises a 2 multiplied by 2 polarization maintaining optical fiber coupler (5), a first polarization maintaining optical fiber (6), a second polarization maintaining optical fiber (7), a flexible material (8) and a power-on electrode (9); two output ends of the circulator (3) are respectively connected with one input end of a 2 x 2 polarization-maintaining optical fiber coupler (5) and the spectrum analyzer (4), the other input end of the 2 x 2 polarization-maintaining optical fiber coupler (5) is vacant, two output ends of the 2 x 2 polarization-maintaining optical fiber coupler (5) are respectively connected with one ends of a first polarization-maintaining optical fiber (6) and a second polarization-maintaining optical fiber (7), and the other ends of the first polarization-maintaining optical fiber (6) and the second polarization-maintaining optical fiber (7) are welded together through a 90-degree welding point (10), so that the 2 x 2 polarization-maintaining optical fiber coupler (5), the first polarization-maintaining optical fiber (6) and the second polarization-maintaining optical fiber (7) form a Sagnac ring; a part of the first polarization maintaining fiber (6) is used as a magnetic field induction area (11), the first polarization maintaining fiber (6) and the electrified electrode (9) in the magnetic field induction area (11) are wrapped together through a flexible material (8), and the flexible material (8) and the electrified electrode (9) form a structure for inducing a magnetic field.
2. The novel weak magnetic field sensor based on ampere force according to claim 1, wherein: the first polarization maintaining fiber (6) at the magnetic field induction area (11) is uniformly wrapped by a layer of flexible material (8), and the powered electrode (9) is wrapped outside the first polarization maintaining fiber (6) by the flexible material (8), is parallel to the first polarization maintaining fiber (6) and forms an included angle of 45 degrees with the slow axis of the first polarization maintaining fiber.
3. The novel weak magnetic field sensor based on ampere force according to claim 1, wherein: at the 90-degree welding point (10), the first polarization maintaining fiber (6) and the second polarization maintaining fiber (7) are mutually connected in a 90-degree rotating mode, so that the fast axis of the first polarization maintaining fiber (6) is connected with the slow axis of the second polarization maintaining fiber (7), namely the fast axis of the first polarization maintaining fiber (6) is connected with the slow axis of the second polarization maintaining fiber (7), and the slow axis of the first polarization maintaining fiber (6) is connected with the fast axis of the second polarization maintaining fiber (7).
4. The novel weak magnetic field sensor based on ampere force according to claim 1, wherein: by adjusting the polarizer (2), the polarization direction of the incident light is the main axis direction of the two polarization-maintaining optical fibers, and the polarization directions of the two paths of linearly polarized light passing through the 2 x 2 polarization-maintaining optical fiber coupler (5) are respectively on the fast axis of one polarization-maintaining optical fiber and the slow axis of the other polarization-maintaining optical fiber.
5. A novel weak magnetic field detection method based on ampere force by adopting the sensor as claimed in any one of claims 1 to 4, which is characterized in that:
light generated by a light source (1) is changed into linearly polarized light after passing through a polarizer (2), and is input into a 2 x 2 polarization-maintaining optical fiber coupler (5) through a circulator (3), two linearly polarized light beams with equal light intensity and 90-degree phase difference are output by the output end of the 2 x 2 polarization-maintaining optical fiber coupler (5), the two linearly polarized light beams are respectively transmitted in a fast and slow axis in a first polarization-maintaining optical fiber (6) and a second polarization-maintaining optical fiber (7) which form a Sagnac ring, and are changed in transmission optical axis through a 90-degree welding point (10), after being transmitted for a circle in the Sagnac ring, the linearly polarized light beams return to the 2 x 2 polarization-maintaining optical fiber coupler (5) to generate wave combination interference, and the interference light is output to a spectrum analyzer (4) through the circulator (3) to obtain interference data such as interference waveforms of the interference; in the transmission process, the electrified electrode (9) generates ampere force under the action of a magnetic field, and indirectly acts on the first polarization maintaining optical fiber (6) of the magnetic field induction area (11) through the flexible material, so that the polarization maintaining optical fiber generates stress birefringence, the phase difference of two paths of interference light of composite wave interference is changed, the phase difference in interference data is obtained through comparison, and the size of the magnetic field is further obtained.
6. The novel weak magnetic field detection method based on ampere force according to claim 5, characterized in that: the electrified electrode (9) is deformed under the action of ampere force, and the flexible material drives the first polarization maintaining fiber (6) to deform, so that stress birefringence is generated in the first polarization maintaining fiber (6).
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| CN111679230B (en) * | 2020-05-25 | 2022-12-06 | 汕头大学 | Magnetic field sensing device based on magnetic fluid |
| CN115395359B (en) * | 2022-10-28 | 2023-03-10 | 中国航天三江集团有限公司 | Method and device for inhibiting optical fiber SBS (styrene butadiene styrene) effect |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773789A (en) * | 2005-11-04 | 2006-05-17 | 清华大学 | Elastic stressing stress birefringence double-frequency laser |
| CN101074983A (en) * | 2006-05-17 | 2007-11-21 | 袁海骏 | Fiber magnetic optical probe device and its usage system |
| 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 |
| CN201477200U (en) * | 2009-09-04 | 2010-05-19 | 东华大学 | All-fiber type magnetic-field strength on-line sensing survey meter |
| 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 |
| CN102959422A (en) * | 2010-06-24 | 2013-03-06 | Adamant工业株式会社 | Two-core optical fiber magnetic field sensor |
| CN103412175A (en) * | 2013-08-07 | 2013-11-27 | 南京大学 | Photonic crystal fiber current magnetic field sensor and manufacturing and measuring method thereof |
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| JP2015219061A (en) * | 2014-05-15 | 2015-12-07 | Tdk株式会社 | Magnetic field detection sensor and magnetic field detection device using the same |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773789A (en) * | 2005-11-04 | 2006-05-17 | 清华大学 | Elastic stressing stress birefringence double-frequency laser |
| CN101074983A (en) * | 2006-05-17 | 2007-11-21 | 袁海骏 | Fiber magnetic optical probe device and its usage system |
| 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 |
| CN201477200U (en) * | 2009-09-04 | 2010-05-19 | 东华大学 | All-fiber type magnetic-field strength on-line sensing survey meter |
| 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 |
| CN102959422A (en) * | 2010-06-24 | 2013-03-06 | Adamant工业株式会社 | Two-core optical fiber magnetic field sensor |
| CN103412175A (en) * | 2013-08-07 | 2013-11-27 | 南京大学 | Photonic crystal fiber current magnetic field sensor and manufacturing and measuring method thereof |
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