CN101598774B - Metallization packaged magneto-optical sensor - Google Patents
Metallization packaged magneto-optical sensor Download PDFInfo
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- CN101598774B CN101598774B CN2009100724943A CN200910072494A CN101598774B CN 101598774 B CN101598774 B CN 101598774B CN 2009100724943 A CN2009100724943 A CN 2009100724943A CN 200910072494 A CN200910072494 A CN 200910072494A CN 101598774 B CN101598774 B CN 101598774B
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- metal
- packaging tube
- optical sensor
- magneto
- metal packaging
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Abstract
A metallization packaged magneto-optical sensor relates to a magneto-optical sensor. The invention aims at solving the problem that the existing magneto-optical sensor has low measuring accuracy, poor performance stability and short service life. One end in the metal packaged tube of the sensor is provided with a first rectangular groove matched with the profile of a polarizing prism, the other end in the metal packaged tube is provided with a second rectangular groove matched with the profile of a polarizing beam splitter prism, a round through hole matched with cylinder optical sensing glass is arranged between the two rectangular grooves in the metal packaged tube, the centre lines of the two rectangular grooves, the round through hole and the metal packaged hole are coincident, the two rectangular grooves form a corner of 45 degrees around the centre line, a buffer layer is arranged between the cylinder optical sensing glass and the inner wall of the metal packaged tube, the two ends of the metal packaged tube are respectively welded on a metal rack, a first fiber collimator and a second fiber collimator are respectively matched with the centre hole of the metal rack and fixed by welding. The invention is used as a magneto-optical sensor.
Description
Technical field
The present invention relates to a kind of metallization packaged magneto-optical sensor.
Background technology
Magneto-optical sensor is a kind of novel magnetic field sensor based on Faraday magnetooptical effect; Its basic functional principle is: a branch of linearly polarized light through the magneto-optic glass that places magnetic field after; The position angle of linearly polarized light deflects, the size of position angle deflection and the direct ratio that is integrated into along the magnetic-field component of light path direction.Through the deflection angle of slotted line polarized light, can calculate the size of a certain zone thus in the average magnetic field intensity of a certain direction; When light path more in short-term, can reflect that then certain is a bit in magnitude of field intensity of a certain direction.If cooperate the magnetic field gathering-device, then the output valve of magnetic field gathering-device can reflect the size of the electrical current of the conductor of setting up magnetic field.
Advantages such as magneto-optical sensor is strong with its antijamming capability, volume is little, in light weight, frequency band and wide dynamic range become the novel magnetic field sensor that has competitive power.But for a long time, magneto-optical sensor is low owing to accuracy of measurement, stability difference and serviceable life shortly fail to be widely used, and its main cause is: the stress linear birefrigence that is caused by temperature has influenced the accuracy of measurement of magneto-optical sensor; The optical cement of bonding each optical element causes the stability of magneto-optical sensor poor owing to Effect of Environmental such as receiving temperature produces deformation in the light path; The sex change of optical cement comes off and causes shorten its serviceable life.
Summary of the invention
The objective of the invention is that existing magneto-optical sensor accuracy of measurement is low in order to solve, the stability difference and serviceable life short problem, a kind of metallization packaged magneto-optical sensor has been proposed.
The present invention includes first optical fiber collimator, polarizing prism, right cylinder optical sensing glass, polarization beam splitter prism, second optical fiber collimator, Metal Packaging tube, cushion and two metal frame; The interior end of Metal Packaging tube has first square groove and this first square groove and polarizing prism profile and is complementary; The interior other end of Metal Packaging tube has second square groove and this second square groove and polarization beam splitter prism profile and is complementary; Between interior two square grooves of Metal Packaging tube manhole and this manhole and right cylinder optical sensing glassy phase coupling; Two square grooves, manhole and Metal Packaging tubes have the center line that coincides; Has corner between two square grooves around relative 45 degree of center line; Be provided with cushion between the outside surface of right cylinder optical sensing glass and the inwall of Metal Packaging tube, weld with a metal frame respectively mutually at the two ends of Metal Packaging tube, the outline equal and opposite in direction of the xsect of metal frame and Metal Packaging tube; Metal frame has central through hole, and first optical fiber collimator and second optical fiber collimator are complementary with the central through hole of a metal frame respectively and are welded to each other fixing.
Advantage of the present invention is:
The encapsulation of Metal Packaging tube makes for the right cylinder optical sensing glass of inside among the present invention; The thermal constant of all directions is identical; Simultaneously the each several part of right cylinder optical sensing glass is a symmetrical structure with respect to the axis, when peripheral temperature is consistent, can guarantees that everywhere heat interchange is balanced and makes the stress unanimity of all directions and make stress drop extremely minimum; Thereby, make the accuracy of measurement bring up to 0.2 grade because the inconsistent stress birefrin that causes of stress is reduced to minimumly; The components and parts of propagating among the present invention on the light path adopt the inner structure of Metal Packaging tube to fix; Adhesion without adhesiver connects; Make the light loss of propagating light path reduce; And avoided adopting the bonding deformation that receives Effect of Environmental generations such as temperature that causes of optical cement, made magneto-optical sensor long-time running good stability; Metal Packaging tube, metal frame and optical fiber collimator adopt welding manner to be connected to integral body each other, compare with using the bonding mode of optical cement, because optical cement receives such environmental effects to be prone to come off, prolong the serviceable life of magneto-optical sensor of the present invention.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention; Fig. 2 is the left view of the outline of xsect for circular Metal Packaging tube; Fig. 3 is the left view of the outline of xsect for circular metal frame; Fig. 4 is that the outline of xsect is foursquare Metal Packaging tube left view, and Fig. 5 is that the outline of xsect is the left view of foursquare metal frame, Fig. 6 schematic diagram of the present invention.
Embodiment
Embodiment one: this embodiment is described below in conjunction with Fig. 1 and Fig. 6; This embodiment comprises first optical fiber collimator 1, polarizing prism 2, right cylinder optical sensing glass 3, polarization beam splitter prism 4, second optical fiber collimator 5, Metal Packaging tube 6, cushion 7 and two metal frame 8; Metal Packaging tube 6 interior ends have first square groove and are complementary with polarizing prism 2 profiles; The Metal Packaging tube 6 interior other ends have second square groove and are complementary with polarization beam splitter prism 4 profiles; Be complementary for manhole and with right cylinder optical sensing glass 3 between Metal Packaging tube 6 interior two square grooves; Two square grooves, manhole and Metal Packaging tubes 6 have the center line that coincides; Has corner between two square grooves around relative 45 degree of center line; Be provided with cushion 7 between the outside surface of right cylinder optical sensing glass 3 and the inwall of Metal Packaging tube 6, weld with a metal frame 8 respectively mutually at the two ends of Metal Packaging tube 6, the outline equal and opposite in direction of the xsect of metal frame 8 and Metal Packaging tube 6; Metal frame 8 has central through hole, and first optical fiber collimator 1 and second optical fiber collimator 5 are complementary with the central through hole of a metal frame 8 respectively and are welded to each other fixing.
Processing to Metal Packaging tube 6: at first on derby, process a manhole, the somewhat larger in diameter of through hole is in the diameter of right cylinder optical sensing glass 3; End at derby is processed first square groove, and the degree of depth of groove matches with the size of polarizing prism 2 with size; Derby is rotated 45 degree around center line, process second square groove at the other end of derby in the same way, match with the size of polarization beam splitter prism 4; Right cylinder optical sensing glass 3 and cushion 7 are put into the manhole part of Metal Packaging tube 6; Again polarizing prism 2 and polarization beam splitter prism 4 are placed two square grooves at Metal Packaging tube 6 inner two ends respectively; And strong bond is in groove; Owing to be processed into relative rotation miter angle between two square grooves in the Metal Packaging tube 6; So also have the corner around relative 45 degree of center line between polarizing prism 2 and the polarization beam splitter prism 4, the detection to linearly polarized light can obtain maximum sensitivity like this.
The course of work: a branch of natural light gets into polarizing prism 2 through first optical fiber collimator 1 and changes a branch of linearly polarized light into; Linearly polarized light through the right cylinder optical sensing glass 3 that places magnetic field after; Deflection has taken place in the linear polarization polarization surface; Produced faraday's rotation angle, the linearly polarized light after deflecting gets into second optical fiber collimator 5 through polarization beam splitter prism 4 again.
Polarizing prism 2 has the same direction of shaking thoroughly with polarization beam splitter prism 4; When the two rotates 45 degree relatively around center line; Then its direction of shaking thoroughly to light has produced the angle of 45 degree; When light enters into right cylinder optical sensing glass 3 through polarizing prism 2; Under the effect in magnetic field; The direction of vibration of light deflects around center line; The angle of the direction of vibration of the light after deflecting and the direction of shaking thoroughly of polarizing prism 2 is the detection of faraday's rotation angle
to the linearly polarized light of right cylinder optical sensing glass 3 outputs; Can only reflect faraday's rotation angle
according to Malus law through light intensity, linearly polarized light is through behind the polarization beam splitter prism 4, and its transmitted light intensity satisfies:
J
o＝J
i?cos
2α，
Wherein, J
iBe the light intensity of incoming line polarized light, α is around the relative corner of center line, J between polarizing prism 2 and the polarization beam splitter prism 4
oBe the light intensity through polarization beam splitter prism 4, then the output intensity through right cylinder optical sensing glass 3 and polarization beam splitter prism 4 is:
Output intensity to the detection sensitivity of faraday's rotation angle is thus:
Usually faraday's rotation angle is smaller, for obtaining maximum sensitivity, makes α=± 45 °, then:
It is thus clear that, to the detection of linearly polarized light adopt one with polarizing prism 2 around the axis polarization beam splitter prism 4 of rotation 45 degree relatively, with obtaining maximum sensitivity.
Shown in Figure 6; Lines A represents optical axis; Arrow is represented magnetic direction shown in the B, and
is faraday's rotation angle.
Embodiment two: this embodiment is that with the difference of embodiment one it also comprises the 3rd optical fiber collimator 10; The sidewall of said Metal Packaging tube 6 radially has pilot hole 9; Pilot hole 9 communicates perpendicular to side of second square groove and with second square groove, and pilot hole 9 and the 3rd optical fiber collimator 10 are complementary and are welded to each other fixing.Other composition and annexation are identical with embodiment one.
Utilize laser-beam welding machine that the metal shell of first optical fiber collimator 1 and second optical fiber collimator 5 is weldingly fixed on respectively in the central through hole of a metal frame 8, the metal shell of the 3rd optical fiber collimator 10 is weldingly fixed in the pilot hole 9; Again two metal frame 8 are installed in respectively on two optics micropositioning stages; Metal Packaging tube 6 places on the optics objective table and fixes; Regulating the optics micropositioning stage makes the light path system of whole magneto-optical sensor be in the optimal working state; And be fixed up, two metal frame 8 and Metal Packaging tube 6 is integrally welded.
The 3rd optical fiber collimator 10 is set, gets into second optical fiber collimator 5 and the 3rd optical fiber collimator 10 again after making linearly polarized light after deflecting through polarization beam splitter prism 4, can measure the dc information in the electric current in generation magnetic field.
Because polarization beam splitter prism 4 is respectively around the corner orientation of axis with polarizing prism 2 mutually+45 ° with-45 °, i.e. the output intensity J of two of polarization beam splitter prism 4 outbound courses
O1And J
O2Expression formula is expressed as respectively:
In magnetic field, contain D.C. magnetic field information; Also contain the D.C. magnetic field component in corresponding faraday's rotation angle
; Get the output intensity of two outbound courses of polarization beam splitter prism 4, can accurately calculate the faraday's rotation angle
that contains DC component through following formula
Embodiment three: this embodiment and embodiment one or two difference are that the material of said Metal Packaging tube 6 is a purity greater than 99% aluminium.Other composition and annexation are identical with embodiment one or two.
Embodiment four: this embodiment is that with embodiment one or two difference the material of said Metal Packaging tube 6 is a stainless steel.Other composition and annexation are identical with embodiment one or two.
Embodiment five: below in conjunction with Fig. 2～Fig. 5 this embodiment is described, this embodiment is that with embodiment one or two difference the said Metal Packaging tube 6 and the outline of the xsect of metal frame 8 are circle or square simultaneously.Other composition and annexation are identical with embodiment one or two.
The hollow cylinder of Metal Packaging tube 6 employing axis symmetry or the hollow rectangular structure of axis near symmetrical; Its purpose is the right cylinder optical sensing glass 3 of inside is produced the thermal source of symmetry; Metal Packaging tube 6 is owing to be the good conductor of heat simultaneously; Even external temperature is variant, the each several part temperature of Metal Packaging tube 6 still can be consistent very soon.
Embodiment six: below in conjunction with Fig. 2～Fig. 5 this embodiment is described, this embodiment is that with the difference of embodiment three the said Metal Packaging tube 6 and the outline of the xsect of metal frame 8 are circle or square simultaneously.Other composition and annexation are identical with embodiment three.
Embodiment seven: below in conjunction with Fig. 2～Fig. 5 this embodiment is described, this embodiment is that with the difference of embodiment four the said Metal Packaging tube 6 and the outline of the xsect of metal frame 8 are circle or square simultaneously.Other composition and annexation are identical with embodiment four.
The present invention can be applied in the magneto-optical sensor based on Faraday magnetooptical effect, also can be used for the optical passive component of other block structure.
Claims (7)
1. metallization packaged magneto-optical sensor; It is characterized in that it comprises first optical fiber collimator (1), polarizing prism (2), right cylinder optical sensing glass (3), polarization beam splitter prism (4), second optical fiber collimator (5), Metal Packaging tube (6), cushion (7) and two metal frame (8); The interior end of Metal Packaging tube (6) has first square groove and this first square groove and polarizing prism (2) profile and is complementary; The interior other end of Metal Packaging tube (6) has second square groove and this second square groove and polarization beam splitter prism (4) profile and is complementary; Be that manhole and this manhole and right cylinder optical sensing glass (3) are complementary between interior two square grooves of Metal Packaging tube (6); Two square grooves, manhole and Metal Packaging tubes (6) have the center line that coincides; Has corner between two square grooves around relative 45 degree of center line; Be provided with cushion (7) between the inwall of the outside surface of right cylinder optical sensing glass (3) and Metal Packaging tube (6), weld with a metal frame (8) respectively mutually at the two ends of Metal Packaging tube (6), the outline equal and opposite in direction of the xsect of metal frame (8) and Metal Packaging tube (6); Metal frame (8) has central through hole, and first optical fiber collimator (1) and second optical fiber collimator (5) are complementary with the central through hole of a metal frame (8) respectively and are welded to each other fixing.
2. metallization packaged magneto-optical sensor according to claim 1; It is characterized in that said metallization packaged magneto-optical sensor also comprises the 3rd optical fiber collimator (10); The sidewall of said Metal Packaging tube (6) radially has pilot hole (9); Pilot hole (9) communicates perpendicular to side of second square groove and with second square groove, and pilot hole (9) is complementary with the 3rd optical fiber collimator (10) and is welded to each other fixing.
3. metallization packaged magneto-optical sensor according to claim 1 and 2, the material that it is characterized in that said Metal Packaging tube (6) are purity greater than 99% aluminium.
4. metallization packaged magneto-optical sensor according to claim 1 and 2, the material that it is characterized in that said Metal Packaging tube (6) is a stainless steel.
5. metallization packaged magneto-optical sensor according to claim 1 and 2 is characterized in that the said Metal Packaging tube (6) and the outline of the xsect of metal frame (8) are circle or square simultaneously.
6. metallization packaged magneto-optical sensor according to claim 3 is characterized in that the said Metal Packaging tube (6) and the outline of the xsect of metal frame (8) are circle or square simultaneously.
7. metallization packaged magneto-optical sensor according to claim 4 is characterized in that the said Metal Packaging tube (6) and the outline of the xsect of metal frame (8) are circle or square simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100724943A CN101598774B (en) | 2009-07-13 | 2009-07-13 | Metallization packaged magneto-optical sensor |
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|---|---|---|---|
| CN2009100724943A CN101598774B (en) | 2009-07-13 | 2009-07-13 | Metallization packaged magneto-optical sensor |
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| CN101598774A CN101598774A (en) | 2009-12-09 |
| CN101598774B true CN101598774B (en) | 2012-06-27 |
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| CN2009100724943A Expired - Fee Related CN101598774B (en) | 2009-07-13 | 2009-07-13 | Metallization packaged magneto-optical sensor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565496A (en) * | 2011-11-23 | 2012-07-11 | 哈尔滨工业大学 | Two-way transmission optical current sensor |
| CN114720782A (en) * | 2022-03-10 | 2022-07-08 | 云南电网有限责任公司电力科学研究院 | Packaging device and electro-optical sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4919522A (en) * | 1988-02-25 | 1990-04-24 | Geo-Centers, Inc. | Optical switch having birefringent element |
| CN1152772A (en) * | 1995-06-02 | 1997-06-25 | 松下电器产业株式会社 | Magnetic-optical sensor with optical store |
| WO2000023811A1 (en) * | 1998-10-21 | 2000-04-27 | Duncan Paul G | Methods and apparatus for optically measuring polarization rotation of optical wave fronts using rare earth iron garnets |
-
2009
- 2009-07-13 CN CN2009100724943A patent/CN101598774B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4919522A (en) * | 1988-02-25 | 1990-04-24 | Geo-Centers, Inc. | Optical switch having birefringent element |
| CN1152772A (en) * | 1995-06-02 | 1997-06-25 | 松下电器产业株式会社 | Magnetic-optical sensor with optical store |
| WO2000023811A1 (en) * | 1998-10-21 | 2000-04-27 | Duncan Paul G | Methods and apparatus for optically measuring polarization rotation of optical wave fronts using rare earth iron garnets |
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Effective date of registration: 20190429 Address after: 150001 No. 92 West straight street, Nangang District, Heilongjiang, Harbin Patentee after: Harbin Institute of Technology Address before: 150001 No. 92 West straight street, Nangang District, Heilongjiang, Harbin Co-patentee before: Beijing Phoebus Vision Optoelectronics Technology Co., Ltd. Patentee before: Harbin Institute of Technology |
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