CN2651762Y - Sensing head of small polarization analysis magneto-optic independent magnetic field sensor - Google Patents
Sensing head of small polarization analysis magneto-optic independent magnetic field sensor Download PDFInfo
- Publication number
- CN2651762Y CN2651762Y CN 03277423 CN03277423U CN2651762Y CN 2651762 Y CN2651762 Y CN 2651762Y CN 03277423 CN03277423 CN 03277423 CN 03277423 U CN03277423 U CN 03277423U CN 2651762 Y CN2651762 Y CN 2651762Y
- Authority
- CN
- China
- Prior art keywords
- input end
- optical
- magnetic field
- uniaxial crystal
- crystal angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
The utility model relates to a minisize polarization irrelevant magnetic and optical fiber magnetic field sensor sensing head that is based on Faraday magnetic and optical effect and is able to realize the measurement of magnetic field or current, which comprises an input end component 1, an output end component 3 and an optical component 2. The input end component is composed of an input optical fiber 11, a single optical fiber cilia 12, a collimating lens 13 and an input end sleeve 14; the output end component is composed of an output optical fiber 31, a single optical fiber cilia 32, a collimating lens 33 and an output end sleeve 34; the optical component is composed of a 0 degree single axis crystal locking angle piece 21, a Faraday rotation piece 22 and a 90 degree single axis crystal locking angle piece 23, which are arranged in sequence between the input end component and the output end component. Therefore, the utility model, which is able to counteract electromagnetic disturbance and realize real time measurement, has the advantages of simple structure, small size and irrelevant polarization.
Description
Technical field:
The utility model relates to a kind of magnetic field sensing device based on magneto-optic effect of miniaturization polarization independent type.Particularly relate to a kind of miniaturization polarization irrelevant magneto-optical fibre optic magnetic field sensor sensing head of realizing magnetic field or current measurement based on Faraday magnetooptical effect.
Background technology:
The fibre-optic current or the magnetic field sensing device that detect magnetic field or electric current with magneto-optic effect are the directions of recent each company's development of new magnetic sensitive fiber optic sensing device.The magneto-optical Fibre Optical Sensor has sensing head volume little (with respect to other technology), passive measurement, the characteristics that are not subjected to that magnetic saturation influences etc.Transducing signal can fundamentally provide high-tension isolation by Optical Fiber Transmission.
The sensing head of fibre optic magnetic field sensor commonly used is a full fiber type at present.The full fiber type sensing head directly utilizes the Faraday effect of optical fiber itself to carry out the magneto-optic conversion.This type optical fiber magnetic field sensor sensing head will be with extraordinary low birefringent fiber as sensing material.Because the optical fiber fabrication difficulty causes cost higher.In addition, sensing head complex structure, volume are bigger, are difficult for transferring the sample school.The sensor of full fiber type wants coiled fiber optic coils volume also bigger.Use not too extensive at present.
Summary of the invention:
The purpose of this utility model is to overcome above-mentioned deficiency, provide a kind of simple and compact for structure, be easy to adjustment and miniaturization polarization irrelevant magneto-optical magnetic field sensor sensing head with low cost.
The purpose of this utility model is achieved in that a kind of miniaturization polarization irrelevant magneto-optical magnetic field sensor sensing head, it comprises input end assembly, cap assembly and optical element assembly, the input end assembly comprises input optical fibre, single fiber kapillary, collimation lens and input end sleeve pipe, single fiber kapillary and collimation lens are forward and backward to be inserted in the input end sleeve pipe, and the input optical fibre rear end is inserted in the single fiber kapillary; Cap assembly comprises output optical fibre, single fiber kapillary, collimation lens and output terminal sleeve pipe, and collimation lens and single fiber kapillary are forward and backward to be inserted in the output terminal sleeve pipe, and the output optical fibre front end is inserted in the single fiber kapillary; The optical element assembly comprises 0 ° of uniaxial crystal angle of wedge sheet, faraday's revolving fragment and 90 ° of uniaxial crystal angle of wedge sheets, and the three is arranged in order between input end assembly and cap assembly.
Light enters 0 ° of uniaxial crystal angle of wedge sheet from input end fiber through the collimation lens collimation and is divided into two bunch polarisations, enter faraday's revolving fragment, under the action of a magnetic field, produce the plane of polarization rotation, after plane of polarization changes, enter 90 ° of uniaxial crystal angle of wedge sheets and produce the different linearly polarized light in four bundle polarization directions.Wherein the two bundle directions of propagation are parallel, are coupled into output terminal.During use, sensing head places by measuring magnetic field, magnetic field intensity difference, the light intensity difference of output terminal.The measuring light signal intensity can be by the intensity of measuring magnetic field.
Because the measured modulation of the utility model realizes with faraday's rotatory device, the signal Optical Fiber Transmission, these devices are compared with traditional electromagnetism method of testing, can work under strong-electromagnetic field.The signal Sensitive Apparatus is connected with optical fiber with disposal system, has avoided electron device closely from test site like this, also can accomplish real-time monitoring by optical fiber.Because used optical fiber and optical device volume are very little, the total volume of the sensing head of composition is very little.In addition owing to device inside optics core members realizes the no requirement (NR) of input beam polarization state.
Compared with prior art, the utlity model has following advantage: anti-electromagnetic interference (EMI), measure in real time, simple in structure, volume is little, polarization irrelevant.
Description of drawings:
Fig. 1 is a diagrammatic cross-section of the present utility model.
Fig. 2 is the utility model light path synoptic diagram.
Embodiment:
As Fig. 1, the utility model is a kind of miniaturization polarization irrelevant magneto-optical magnetic field sensor sensing head.It mainly is made up of input end assembly 1, cap assembly 3 and optical element assembly 2.
Input end assembly 1 is made up of input optical fibre 11, single fiber kapillary 12, collimation lens 13 and input end sleeve pipe 14.Single fiber kapillary 12 and collimation lens 13 forward and backward being inserted in the input end sleeve pipe 14, input optical fibre 11 rear ends are inserted in the single fiber kapillary 12.Single fiber kapillary 12 is used for fixing input optical fibre 11, and input end sleeve pipe 14 is used for fixing collimation lens 13 and single fiber kapillary 12, and collimation lens 13 is used for the light beam of collimating optical fibre input.
Cap assembly 3 is made up of output optical fibre 31, single fiber kapillary 32, collimation lens 33 and output terminal sleeve pipe 34.Collimation lens 33 and single fiber kapillary 32 forward and backward being inserted in the output terminal sleeve pipe 34, output optical fibre 31 front ends are inserted in the single fiber kapillary 32.Single fiber kapillary 32 is used for fixing output optical fibre 31, and output terminal sleeve pipe 34 is used for fixing collimation lens 33 and single fiber kapillary 32, collimation lens 33 in order to convergent beam to this output optical fibre 31.
Internal core optical element assembly 2 of the present utility model is taken over 24 by 0 ° of uniaxial crystal angle of wedge sheet 21,22,90 ° of uniaxial crystal angle of wedge sheets 23 of faraday's revolving fragment and short glass and is formed.0 ° of uniaxial crystal angle of wedge sheet 21, faraday's revolving fragment 22 and 90 ° of uniaxial crystal angle of wedge sheets 23 are arranged in order between input end assembly 1 and cap assembly 3.0 ° of uniaxial crystal angle of wedge sheet 21, faraday's revolving fragment 22 and 90 ° of uniaxial crystal angle of wedge sheets 23 bond together successively and place short glass to take in 24.0 ° of uniaxial crystal angle of wedge sheet 21 and the optical axis of 90 ° of uniaxial crystal angle of wedge sheets 23 are orthogonal to become 90 °.Short glass is taken over 24 and is linked to each other with input end sleeve pipe 14 rear ends, and 0 ° of uniaxial crystal angle of wedge sheet 21 front end and input end collimation lens 13 rear ends bond together.
As Fig. 2, the optical signal transmission process is as follows: light beam 4 is a free position by 0 ° of uniaxial crystal angle of wedge sheet, 21 preceding plane of polarizations, is divided into two bunch polarized lights 41,42 when transmitting in 0 ° of uniaxial crystal angle of wedge sheet 21.After two-beam entered faraday's revolving fragment 22, plane of polarization rotated under the action of a magnetic field.Light beam is divided into four row light beams 411,412,421,422 in 90 ° of uniaxial crystal angle of wedge sheets 23, behind 90 ° of uniaxial crystal angle of wedge sheets 23, light beam 412,422 is parallel with incident beam 4 directions, and light beam 411,421 and incident beam 4 deviations in driction are opened.Light beam 412,422 finally can coupled into optical fibres.Light beam 411,421 is depleted owing to departing from.
Claims (4)
1, a kind of miniaturization polarization irrelevant magneto-optical magnetic field sensor sensing head, it is characterized in that it comprises input end assembly (1), cap assembly (3) and optical element assembly (2), input end assembly (1) comprises input optical fibre (11), single fiber kapillary (12), collimation lens (13) and input end sleeve pipe (14), single fiber kapillary (12) and collimation lens (13) are forward and backward to be inserted in the input end sleeve pipe (14), and input optical fibre (11) front end is inserted in the single fiber kapillary (12); Cap assembly (3) comprises output optical fibre (31), single fiber kapillary (32), collimation lens (33) and output terminal sleeve pipe (34), collimation lens (33) and single fiber kapillary (32) are forward and backward to be inserted in the output terminal sleeve pipe (34), and output optical fibre (31) rear end is inserted in the single fiber kapillary (32); Optical element assembly (2) comprises 0 ° of uniaxial crystal angle of wedge sheet (21), faraday's revolving fragment (22) and 90 ° of uniaxial crystal angle of wedge sheets (23), and the three is arranged in order between input end assembly (1) and cap assembly (3).
2, a kind of miniaturization polarization irrelevant magneto-optical magnetic field sensor sensing head according to claim 1 is characterized in that the 0 ° of uniaxial crystal angle of wedge sheet (21) and the optical axis of 90 ° of uniaxial crystal angle of wedge sheets (23) are orthogonal and becomes 90 °.
3, a kind of miniaturization polarization irrelevant magneto-optical magnetic field sensor sensing head according to claim 1 and 2 is characterized in that 0 ° of uniaxial crystal angle of wedge sheet (21), faraday's revolving fragment (22) and 90 ° of uniaxial crystal angle of wedge sheets (23) bond together successively.
4, a kind of miniaturization polarization irrelevant magneto-optical magnetic field sensor sensing head according to claim 3, it is characterized in that optical element assembly (2) comprises that also one takes over (24), taking over (24) links to each other with input end sleeve pipe (14) rear end, 0 ° of uniaxial crystal angle of wedge sheet (21), faraday's revolving fragment (22) and 90 ° of uniaxial crystal angle of wedge sheets (23) place in the adapter (24), and 0 ° of uniaxial crystal angle of wedge sheet (21) front end and input end collimation lens (13) rear end bond together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03277423 CN2651762Y (en) | 2003-08-06 | 2003-08-06 | Sensing head of small polarization analysis magneto-optic independent magnetic field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03277423 CN2651762Y (en) | 2003-08-06 | 2003-08-06 | Sensing head of small polarization analysis magneto-optic independent magnetic field sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2651762Y true CN2651762Y (en) | 2004-10-27 |
Family
ID=34331798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03277423 Expired - Fee Related CN2651762Y (en) | 2003-08-06 | 2003-08-06 | Sensing head of small polarization analysis magneto-optic independent magnetic field sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2651762Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193074A (en) * | 2011-03-15 | 2011-09-21 | 中国科学技术大学 | Magnetic-field measurement device and manufacturing method thereof as well as magnetic-field measurement method |
| CN103091528A (en) * | 2011-11-04 | 2013-05-08 | 深圳市众望达光电有限公司 | Optical fiber current transformer |
| CN105487024A (en) * | 2016-02-18 | 2016-04-13 | 三峡大学 | Weak magnetic sensor based on magneto-optical coupling and magnetic field measurement method |
-
2003
- 2003-08-06 CN CN 03277423 patent/CN2651762Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102193074A (en) * | 2011-03-15 | 2011-09-21 | 中国科学技术大学 | Magnetic-field measurement device and manufacturing method thereof as well as magnetic-field measurement method |
| CN102193074B (en) * | 2011-03-15 | 2013-05-29 | 中国科学技术大学 | Magnetic-field measurement device and manufacturing method thereof as well as magnetic-field measurement method |
| CN103091528A (en) * | 2011-11-04 | 2013-05-08 | 深圳市众望达光电有限公司 | Optical fiber current transformer |
| CN103091528B (en) * | 2011-11-04 | 2015-09-16 | 深圳市众望达光电有限公司 | A kind of optical-fiber-type current transformer |
| CN105487024A (en) * | 2016-02-18 | 2016-04-13 | 三峡大学 | Weak magnetic sensor based on magneto-optical coupling and magnetic field measurement method |
| CN105487024B (en) * | 2016-02-18 | 2018-11-13 | 三峡大学 | Weak magnetic sensor and Measurement Method for Magnetic Field based on magneto-optic coupling |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5475489A (en) | Determination of induced change of polarization state of light | |
| US6437885B1 (en) | Semiconductor sensor for optically measuring polarization rotation of optical wavefronts using rare earth iron garnets | |
| CN100340860C (en) | Optical fibre current transformer and its loop detector of transformer | |
| CN103076155B (en) | Optical fiber Verdet constant measurement system on basis of double optical paths | |
| CN101074983B (en) | Fiber magnetic optical probe device and its usage system | |
| CN106526277B (en) | A kind of Novel light path sensing unit for low pressure optical current sensor | |
| CN100334454C (en) | Current measuring device | |
| CN1844942A (en) | Photoelectric integrated sensor for strong electric field measurement | |
| CN103017687A (en) | Orthogonal polarization fiber bragg grating vector torsion sensing device and detection method thereof | |
| JPH05503995A (en) | Integrated optical Pockels cell voltage sensor | |
| CN102472785B (en) | Probe for electric/magnetic field | |
| WO2014127654A1 (en) | Quasi-reciprocal reflective optical voltage sensing unit and sensing system thereof | |
| CN101344452A (en) | Method and device for implementing polarization sensitive optical time domain reflection technology by using piezoelectric ceramic | |
| CN103900680A (en) | Device and detecting method for restraining polarization crosstalk measuring noise by the adoption of light source | |
| CN1862264A (en) | Electrode antenna integrated photoelectric integrated sensor for testing strong electric field | |
| EP3690466A1 (en) | Magnetic sensor element and magnetic sensor device | |
| CN2651762Y (en) | Sensing head of small polarization analysis magneto-optic independent magnetic field sensor | |
| CN106291039A (en) | Magneto-opitcal current transducer | |
| CN202305631U (en) | Optical-fiber-type current transformer | |
| CN209746025U (en) | Current measurement system based on double fiber bragg gratings | |
| CN2651761Y (en) | Sensing head of small polarization analysis magneto-optic magnetic field sensor | |
| CN106291040A (en) | Magneto-opitcal current transducer | |
| US5933238A (en) | Optical current measurement device and method of manufacturing it | |
| CN109709375A (en) | A kind of current measurement system and current measuring method based on double optical fiber grating | |
| CN108956092A (en) | A kind of polarization coupled distribution calibration device and method based on integration Y wave guide structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |