CN203673053U - Fiber-based magnetic field sensor - Google Patents
Fiber-based magnetic field sensor Download PDFInfo
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- CN203673053U CN203673053U CN201420027490.XU CN201420027490U CN203673053U CN 203673053 U CN203673053 U CN 203673053U CN 201420027490 U CN201420027490 U CN 201420027490U CN 203673053 U CN203673053 U CN 203673053U
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- magnetic field
- fibre
- fiber
- field sensor
- polarization maintaining
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Abstract
The utility model relates to a fiber-based magnetic field sensor which is manufactured by utilizing a principle of converting magnetic field intensity to a refractive index through a magnetically induced birefringence effect by use of a magnetic material. The fiber-based magnetic field sensor comprises a light source, a spectrometer, a 3dB single-mode fiber coupler, a polarization maintaining fiber, a magnetic liquid and a glass sleeve. The specific resonance wavelength change of a fiber loop mirror transmission spectrum is measured through the spectrometer, and magnetic field information is obtained. According to the utility model, a wavelength demodulation mode is utilized, the sensitivity is high, and the manufacturing is simple at the same time.
Description
Technical field
The utility model belongs to fiber optics field, is specifically related to a kind of based on fibre optic magnetic field sensor.
Background technology
It is high that magnetic field sensor has Measurement Resolution, and precision is high and be not subject to the advantages such as environmental interference.The ultimate principle of magnetic field sensor is that magnetic field, with the light transmitting in magneto-optic memory technique, direct or indirect interaction occurs, thereby changes the parameter of light, comprises light intensity, wavelength and polarization state etc.
Magneto-optic memory technique is the key components of magnetic field sensor.Common magneto-optic memory technique has Faraday rotatory material, Kerr magnetooptical effect material and magnetostriction materials.There is in recent years a kind of New Type Magneto material---magnetic liquid.
Magnetic liquid has mangneto optics birefringent characteristic, Faraday effect, field causes transmissison characteristic and mangneto variable refractive index etc.Especially on magneto-optical sensor, be widely used at magnetic-optic devices.Utilize the mangneto variable refractive index phenomenon of magnetic liquid, magnetic liquid is put into the interference cavity of Fabry-Perot interferometer, change the phase place of transmission light, can realize magnetic field sensing.The mangneto variable refractive index character of magnetic liquid is used in fiber loop mirror interferometer, realizes magnetic field sensing by the phase place that changes light.Using the advantage of the magnetic field sensor of interferometer is to have high resolving power and sensitivity.
A kind of is a kind of mangneto optics birefringence effect and dichroic novel sensor that utilizes magnetic liquid based on fibre optic magnetic field sensor.It uses fiber loop mirror interferometer structure, the interference light that two bundles participate in interfering transmits in identical light path, both utilized the highly sensitive advantage of interferometer also to avoid the problems such as the coupling optical path difference of two-beam and the light intensity of balance two-beam, sensor is more easily made.
Utility model content
The problem existing for prior art, the purpose of this utility model is to provide a kind of based on fibre optic magnetic field sensor technical scheme.
Described one is based on fibre optic magnetic field sensor, it is characterized in that comprising light source, spectrometer, 3dB single-mode optical-fibre coupler, polarization maintaining optical fibre, magnetic liquid, glass bushing, two ports of described 3dB single-mode optical-fibre coupler one side connect respectively light source and spectrometer, two ports of opposite side connect polarization maintaining optical fibre, form a fiber loop mirror structure, described magnetic liquid is full of polarization maintaining optical fibre surface by glass bushing.
Described one, based on fibre optic magnetic field sensor, is characterized in that the refractive index of described magnetic liquid changes along with the variation of external magnetic field.
Described one, based on fibre optic magnetic field sensor, is characterized in that described magnetic liquid and polarization maintaining optical fibre are encapsulated in glass bushing.
The utility model has the advantage of: utilize optical fiber structure, make sensor there is the features such as anti-electromagnetic interference (EMI).Be full of magnetic liquid material on guarantor inclined to one side long-period gratings surface, utilize the mangneto optics birefringence effect of magnetic liquid, the change transitions of external magnetic field is become to the variation of polarization maintaining optical fibre covering equivalent refractive index, utilize optic fibre environment to reach the object of measuring magnetic field.Sensor construction is compact simply, volume is little, cost is low.
Brief description of the drawings
Fig. 1 is a kind of structural representation based on fibre optic magnetic field sensor of the utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is described further.
The utility model is a kind of based on fibre optic magnetic field sensor, comprise light source 1, spectrometer 2,3dB single-mode optical-fibre coupler 3, polarization maintaining optical fibre 4, magnetic liquid 5, glass bushing 6, two ports of described 3dB single-mode optical-fibre coupler 3 one sides connect respectively light source 1 and spectrometer 2, two ports of opposite side connect polarization maintaining optical fibre 4, form a fiber loop mirror structure, described magnetic liquid 5 is full of polarization maintaining optical fibre 4 surfaces by glass bushing 6.
As shown in Figure 1, in fiber loop mirror, there is one section of polarization maintaining optical fibre, magnetic liquid is full of to the surface of polarization maintaining optical fibre by glass bushing.In fiber loop mirror, the light that light source sends is divided into through single-mode optical-fibre coupler the light that two bundles transmit in opposite direction, through after polarization maintaining optical fibre, again meets and interferes at single-mode optical-fibre coupler place, and the spectrum of output is observed by spectrometer.Magnetic liquid material can change because being subject to the impact of external magnetic field the effective refractive index of polarization maintaining optical fibre, can make like this spectrum description wavelength of fiber loop mirror output drift about.By monitoring fiber loop mirror transmission spectrum particular resonance peak wave length shift, realize the measurement in magnetic field to external world.
The gordian technique that the utility model can be realized magnetic-field measurement is: by containing the magnetic liquid of magnetic nanoparticle material, be encapsulated in polarization maintaining optical fibre around by glass bushing.Along with the increase in magnetic field, the drift of thanking to the spike length of shaking and can present the different directions of line style of the sensing unit polarization maintaining optical fibre of this Fibre Optical Sensor.
In the present embodiment, selected polarization maintaining optical fibre length is 50cm, and birefringence size is 3.3 × 10
-5.
Claims (3)
1. one kind based on fibre optic magnetic field sensor, it is characterized in that comprising light source (1), spectrometer (2), 3dB single-mode optical-fibre coupler (3), polarization maintaining optical fibre (4), magnetic liquid (5), glass bushing (6), two ports of described 3dB single-mode optical-fibre coupler (3) one sides connect respectively light source (1) and spectrometer (2), two ports of opposite side connect polarization maintaining optical fibre (4), form a fiber loop mirror structure, described magnetic liquid (5) is full of polarization maintaining optical fibre (4) surface by glass bushing (6).
2. one according to claim 1, based on fibre optic magnetic field sensor, is characterized in that the refractive index of described magnetic liquid (5) changes along with the variation of external magnetic field.
3. one according to claim 1, based on fibre optic magnetic field sensor, is characterized in that described magnetic liquid (5) and polarization maintaining optical fibre (4) are encapsulated in glass bushing (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027490.XU CN203673053U (en) | 2014-01-16 | 2014-01-16 | Fiber-based magnetic field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420027490.XU CN203673053U (en) | 2014-01-16 | 2014-01-16 | Fiber-based magnetic field sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203673053U true CN203673053U (en) | 2014-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420027490.XU Expired - Fee Related CN203673053U (en) | 2014-01-16 | 2014-01-16 | Fiber-based magnetic field sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN203673053U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898073A (en) * | 2015-06-16 | 2015-09-09 | 上海理工大学 | Magnetic field sensing device based on U-shaped fiber and Sagnac ring |
| CN108427081A (en) * | 2018-03-14 | 2018-08-21 | 中国科学院半导体研究所 | Magnetosensitive sensing optical cable, production method and distribution type fiber-optic sound sense detection of magnetic field system |
-
2014
- 2014-01-16 CN CN201420027490.XU patent/CN203673053U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898073A (en) * | 2015-06-16 | 2015-09-09 | 上海理工大学 | Magnetic field sensing device based on U-shaped fiber and Sagnac ring |
| CN108427081A (en) * | 2018-03-14 | 2018-08-21 | 中国科学院半导体研究所 | Magnetosensitive sensing optical cable, production method and distribution type fiber-optic sound sense detection of magnetic field system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20150116 |
|
| EXPY | Termination of patent right or utility model |