JPH02281169A - Optical magnetic sensor - Google Patents
Optical magnetic sensorInfo
- Publication number
- JPH02281169A JPH02281169A JP1102624A JP10262489A JPH02281169A JP H02281169 A JPH02281169 A JP H02281169A JP 1102624 A JP1102624 A JP 1102624A JP 10262489 A JP10262489 A JP 10262489A JP H02281169 A JPH02281169 A JP H02281169A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- light
- magneto
- optical fiber
- reflected
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims description 17
- 239000013307 optical fiber Substances 0.000 claims abstract description 25
- 230000010287 polarization Effects 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 abstract 3
- 239000013078 crystal Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電力設備などの磁界を発生する機器の磁界強
度の測定に使用する磁界センサに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic field sensor used to measure the magnetic field strength of equipment that generates a magnetic field, such as power equipment.
従来の技術
従来、この種の光磁気センサは第３図に示すような構成
であった。第３図において、２１．２２は光ファイバ、
２３はロッドレンズ、２４は磁気光学結晶、２５は反射
ミラー、２６は偏光子、２７は入射光、２８は出射光、
２９．３０は光ビームである。以下、光磁気センサには
外部から磁界が加えられているものとして、従来の光磁
気センサの機能・動作を示す。2. Description of the Related Art Conventionally, this type of magneto-optical sensor has had a configuration as shown in FIG. In Figure 3, 21.22 is an optical fiber,
23 is a rod lens, 24 is a magneto-optic crystal, 25 is a reflecting mirror, 26 is a polarizer, 27 is incident light, 28 is outgoing light,
29.30 is a light beam. Hereinafter, the functions and operations of a conventional magneto-optical sensor will be described assuming that a magnetic field is applied to the magneto-optical sensor from the outside.
光ファイバ２１を伝搬する光２７は二酸化チタン（Ｔｉ
Ｏ２）からなる偏光子２６を透過した後、ロッドレンズ
２３で光ビーム２９に変換され、ＹＩＧ結晶２４に入射
する。ＹＩＧ結晶２４に入射した光ビーム２９は反射ミ
ラー２５で反射され、再びＹＩＧ結晶２４に入射する。The light 27 propagating through the optical fiber 21 is made of titanium dioxide (Ti
After passing through a polarizer 26 made of O2), it is converted into a light beam 29 by a rod lens 23, and enters a YIG crystal 24. The light beam 29 that has entered the YIG crystal 24 is reflected by the reflecting mirror 25 and enters the YIG crystal 24 again.
反射ビーム３０はロッドレンズ２３で集光され、偏光子
２６を透過した後、光ファイバ２２に入射し、光２８と
して光フアイバ２２内を伝搬する。The reflected beam 30 is focused by the rod lens 23, passes through the polarizer 26, enters the optical fiber 22, and propagates within the optical fiber 22 as light 28.
第４図に示すように、ＹＩＧ結晶２４に磁界が加えられ
ているとＹＩＧ結晶２４内を光が進行する毎に光の偏光
面が回転する。さらに、磁界の強度が異なると偏光面の
回転の度合いが異なると言う性質を有する。したがって
、ＹＩＧ結晶２４内に入射する前の光ビーム２９の偏光
面とＹＩＧ結晶２４を透過した後の反射ビーム３０の偏
光面は異なっている。偏光子２６は光ビーム２９は損失
なく透過するように設けられているが、光ビーム３０は
偏光面が回転しているために偏光子２６を透過すること
で損失が生じる。この光の損失量は加えられた磁界強度
により変化するので、磁界の変化を光の大きさで検出で
きることとなる。As shown in FIG. 4, when a magnetic field is applied to the YIG crystal 24, the plane of polarization of the light rotates each time the light travels within the YIG crystal 24. Furthermore, it has a property that the degree of rotation of the plane of polarization differs when the strength of the magnetic field differs. Therefore, the plane of polarization of the light beam 29 before entering the YIG crystal 24 and the plane of polarization of the reflected beam 30 after passing through the YIG crystal 24 are different. The polarizer 26 is provided so that the light beam 29 passes therethrough without loss, but since the plane of polarization of the light beam 30 is rotated, a loss occurs when the light beam 30 passes through the polarizer 26 . Since the amount of loss of this light changes depending on the strength of the applied magnetic field, changes in the magnetic field can be detected by the intensity of the light.
発明が解決しようとする課題
このような従来の構成では、光磁気センサを電力設備等
に設置した場合、電力設備とセンシング信号処理部を光
ファイバで結ぶことになる。光ファイバは高い絶縁性を
持つが、光ファイバを保護する被覆は老化するに従い表
面電流を流し易くなる。光磁気センサを高電圧設備等に
設置した場合には、絶縁物であろうとも高電圧部と他の
設備とを有線で結ぶ限り、表面電流による短絡電流が発
生して電力設備が破損する可能性が極めて高くなると言
う問題があった。Problems to be Solved by the Invention In such a conventional configuration, when a magneto-optical sensor is installed in a power facility or the like, the power facility and the sensing signal processing section are connected by an optical fiber. Optical fibers have high insulation properties, but as the coating that protects the optical fibers ages, surface currents tend to flow through them. When a magneto-optical sensor is installed in high-voltage equipment, etc., as long as the high-voltage part and other equipment are connected with wires, even if they are insulated, short-circuit currents due to surface current may occur and damage the power equipment. There was a problem that the sex was extremely high.
本発明はこのような課題を解決するもので、表面電流等
による短絡電流を完全に防止する光磁気センサを提供す
るものである。The present invention solves these problems and provides a magneto-optical sensor that completely prevents short-circuit currents caused by surface currents and the like.
課題を解決するための手段
この課題を解決するために本発明は、光の出力および入
力部と磁界検知部を完全に分離し、磁界検出部に照射さ
れた光を光源方向に反射するようにしたものである。Means for Solving the Problem In order to solve this problem, the present invention completely separates the light output and input section from the magnetic field detection section, and reflects the light irradiated to the magnetic field detection section in the direction of the light source. This is what I did.
作用
この構成により、磁気検知部は光ファイバから完全に離
れており短絡電流は流れないので、電力設備が破損する
可能性を完全になくす、ことができることとなる。Effect: With this configuration, the magnetic detection section is completely separated from the optical fiber and no short-circuit current flows, making it possible to completely eliminate the possibility of damage to the power equipment.
実施例
第１図は本発明の一実施例による光磁気センサの構成を
示すものであり、第１図において、１゜２は光ファイバ
、３，４はロッドレンズ、５は偏光選択素子、６は磁気
光学部材、７はコーナーキューブミラー、８，９は光フ
ァイバで伝送される光の伝送方向を示す矢印、１０．１
１は光の進行方向を示す矢印である。なお、磁気光学部
材６には磁界が加えられているものとする。Embodiment FIG. 1 shows the configuration of a magneto-optical sensor according to an embodiment of the present invention. In FIG. 1, 1°2 is an optical fiber, 3 and 4 are rod lenses, 5 is a polarization selection element, and 6 10.1 is a magneto-optical member; 7 is a corner cube mirror; 8 and 9 are arrows indicating the transmission direction of light transmitted through the optical fiber;
1 is an arrow indicating the direction in which light travels. Note that it is assumed that a magnetic field is applied to the magneto-optical member 6.
まず始めに、コーナーキューブミラーの機能について説
明する。第２図にコーナーキューブミラー構成を示す。First of all, I will explain the function of the corner cube mirror. FIG. 2 shows a corner cube mirror configuration.
同図（ａ）に示したコーナーキューブミラー１２は互い
に直角な３つの反射平面からなる反射部（コーナーキュ
ーブ）１３を複数個同一平面に配置したものである。同
図（ｂ）はこのコーナーキューブ１２の光の反射の様子
を示すもので、入射光１４はコーナーキューブ１２の内
部で完全反射を３回行い、反射光１５は反射光１４にフ
〔シて１．８０度の方向に射出する。この動作は入射光
１４の入射角゛に全く依存せず、光の入射方向に必ず反
射する。なお、３回反射するので反射光の位相状態は１
回の反射とほぼ同しである。コア径１００μｍの光ファ
イバｌを伝搬する光８は偏光子５（ａ）を透過し、特定
の直線偏光にされた後、ロッドレンズ３で平行ビーム１
０に変換される。The corner cube mirror 12 shown in FIG. 1A has a plurality of reflecting portions (corner cubes) 13 each consisting of three reflecting planes perpendicular to each other arranged on the same plane. Figure (b) shows how light is reflected by the corner cube 12. The incident light 14 is completely reflected three times inside the corner cube 12, and the reflected light 15 is attached to the reflected light 14. 1.Eject in the direction of 80 degrees. This operation is completely independent of the incident angle of the incident light 14, and the light is always reflected in the direction of incidence. Note that since it is reflected three times, the phase state of the reflected light is 1.
It is almost the same as the reflection of the times. Light 8 propagating through an optical fiber 1 with a core diameter of 100 μm is transmitted through a polarizer 5 (a) and converted into a specific linearly polarized light, and then transformed into a parallel beam 1 by a rod lens 3.
Converted to 0.
その偏光を保ったまま光ビーム１０は直径１ ｃｍ、厚
み３００μｍのＹＩＧ結晶板６に入射する。この入射光
はＹＩＧ結晶板６を透過してコーナーキューブミラー７
で全反射された後、再びＹＩＧ結晶板６を透過し、反射
ビーム１１となってその一部がロッドレンズ４に入射す
る。ロッドレンズ４はこの光を集光し、検光子５（ｂ）
を透過する。反射ビーム１１はＹＩＧ結晶板６を２回透
過し、その偏光面は回転しているために、検光子５（ｂ
）を透過するときにその光量が減少する。検光子５（ｂ
）を透過した光だけがコア径２００μｍの光ファイバ２
に結合する。受光用光ファイバ２は送信用光ファイバ１
よりも太いので結合効率が大変高く、結合した光は伝搬
光９となって信号処理部（図示ぜず）に伝送される。The light beam 10 enters a YIG crystal plate 6 with a diameter of 1 cm and a thickness of 300 μm while maintaining its polarization. This incident light passes through the YIG crystal plate 6 and the corner cube mirror 7
After being totally reflected, the beam passes through the YIG crystal plate 6 again, becomes a reflected beam 11, and a portion of the reflected beam 11 enters the rod lens 4. The rod lens 4 collects this light, and the analyzer 5(b)
Transparent. The reflected beam 11 passes through the YIG crystal plate 6 twice, and its plane of polarization is rotated, so the analyzer 5 (b
), the amount of light decreases when it passes through. Analyzer 5 (b
) Only the light transmitted through optical fiber 2 with a core diameter of 200 μm
join to. The receiving optical fiber 2 is the transmitting optical fiber 1
The coupling efficiency is very high because the coupling efficiency is very high, and the coupled light becomes propagating light 9 and is transmitted to a signal processing section (not shown).
発明の効果
以上のように本発明によれば、１個のロッドレンズと、
光軸を用いて設けた１本の光ファイバと、上記ロッドレ
ンズおよび光ファイバの間に設けた偏光子から構成し並
列に設けた２組の光コリメータからなる光送信／受信部
と、板状の磁気光学結晶とコーナーキューブからなる検
知部から構成され、光送信部から出射した光が磁気光学
結晶を透過した後コーナーキューブで反射され、再度磁
気光学結晶を透過して光受信部に入力するようにしたこ
とにより、光送信／受信部と磁界検知部が完全に分離し
ているために、検知部から光送信／受信部に短絡電流が
流れることがないと言う効果が得られる。さらに、検知
部と光送信／受信部が離れているので、使用する光波長
に対して透明な容器に密閉したものの中に検知部を設置
して使用することができると言う効果が得られる。Effects of the Invention As described above, according to the present invention, one rod lens,
An optical transmitting/receiving section consisting of one optical fiber provided using the optical axis and two sets of optical collimators arranged in parallel, each consisting of a polarizer provided between the rod lens and the optical fiber, and a plate-shaped The light emitted from the optical transmitter passes through the magneto-optic crystal, is reflected by the corner cube, passes through the magneto-optic crystal again, and enters the optical receiver. By doing this, since the optical transmitting/receiving section and the magnetic field detecting section are completely separated, it is possible to obtain the effect that a short circuit current does not flow from the detecting section to the optical transmitting/receiving section. Furthermore, since the detection section and the optical transmitting/receiving section are separated, there is an advantage that the detection section can be installed and used inside a sealed container that is transparent to the wavelength of light used.
第１図は本発明の実施例による光磁気センサを示す構成
図、第２図は本発明の実施例による光磁気センサで使用
した反射ミラー（コーナーキューブミラー）の構成およ
び動作を示した図、第３図は従来の光磁気センサの構成
を示した図、第４図は磁界中における磁気光学結晶中の
光の偏光面の変化の仕方を説明した図である。
１．２・・・・・・光ファイバ、３，４・・・・・・ロ
ッドレンズ、５・・・・・・偏光選択素子、６・・・・
・・磁気光学部材、７・・・・・・コーナーキューブミ
ラー ８，９・・・・・・光ファイバで伝送される光の
伝送方向を示す矢印、１０．１１・・・・・・光の進行
方向を示す矢印、１２・・・・・・コーナーキューブミ
ラー １３・・・・・・互いに直角な３つの反射平面か
らなる反射部（コーナーキューブ）、１４・・・・・・
入射光、１５・・・・・・反射光。
代理人の氏名 弁理士 粟野重孝 ほか１名第１図
一光フアイバ
ーロッドレンズ
一鳴光遜訊素芸
磁気光宇部材
コーナー午ユープミラー
一光ファイバ１イ云迭、される
光の方向を示す矢印
ｌθ、ｌ／−光の進行方向′ＦＬ示″′を矢印？
Ｏつ
城
ト笥
ＮFIG. 1 is a configuration diagram showing a magneto-optical sensor according to an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration and operation of a reflecting mirror (corner cube mirror) used in the magneto-optical sensor according to an embodiment of the present invention. FIG. 3 is a diagram showing the configuration of a conventional magneto-optical sensor, and FIG. 4 is a diagram illustrating how the plane of polarization of light in a magneto-optic crystal changes in a magnetic field. 1.2... Optical fiber, 3, 4... Rod lens, 5... Polarization selection element, 6...
...Magneto-optical member, 7...Corner cube mirror 8,9...Arrow indicating the transmission direction of light transmitted by optical fiber, 10.11... Arrow indicating the direction of travel, 12... Corner cube mirror 13... Reflection section (corner cube) consisting of three mutually perpendicular reflecting planes, 14...
Incident light, 15...Reflected light. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 1: Optical fiber rod lens: Optical fiber rod lens; Is the traveling direction of light 'FL indication' an arrow?
Claims (1)
ロッドレンズと、光ファイバとから構成した第１、第２
の光コリメータを並列に設けて構成した光送信／受信部
と、板状の磁気光学部材と上記磁気光学部材の片面に設
けたコーナーキューブとから構成した検知部とからなり
、上記光送信部／受信部の第１の光コリメータから出射
した光が検知部の磁気光学部材に照射・透過した後、上
記コーナーキューブミラーで反射され、この反射光が上
記送信部／受信部の第２の光コリメータに入射すること
を特徴とする光磁気センサ。 ２ 第２の光コリメータの光ファイバのコア径が第１の
光コリメータの光ファイバのコア径よりも大きいことを
特徴とする特許請求の範囲第１項記載の光磁気センサ。(1) A first and a second lens consisting of a rod lens with a polarization selection element sandwiched in between and having optical axes aligned with each other, and an optical fiber.
The optical transmitting/receiving section is composed of an optical transmitting/receiving section configured by installing optical collimators in parallel, and a detecting section configured from a plate-shaped magneto-optical member and a corner cube provided on one side of the magneto-optical member. After the light emitted from the first optical collimator of the receiving section irradiates and passes through the magneto-optical member of the detecting section, it is reflected by the corner cube mirror, and this reflected light is transmitted to the second optical collimator of the transmitting section/receiving section. A magneto-optical sensor characterized in that the light is incident on the sensor. 2. The magneto-optical sensor according to claim 1, wherein the core diameter of the optical fiber of the second optical collimator is larger than the core diameter of the optical fiber of the first optical collimator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102624A JPH02281169A (en) | 1989-04-21 | 1989-04-21 | Optical magnetic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102624A JPH02281169A (en) | 1989-04-21 | 1989-04-21 | Optical magnetic sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02281169A true JPH02281169A (en) | 1990-11-16 |
Family
ID=14332397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1102624A Pending JPH02281169A (en) | 1989-04-21 | 1989-04-21 | Optical magnetic sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02281169A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6232763B1 (en) | 1993-03-29 | 2001-05-15 | Matsushita Electric Industrial Co., Ltd. | Magneto-optical element and optical magnetic field sensor |
| JP2008523401A (en) * | 2004-12-13 | 2008-07-03 | シュランベルジェ、ホールディング、リミテッド | Magneto-optic sensor |
-
1989
- 1989-04-21 JP JP1102624A patent/JPH02281169A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6232763B1 (en) | 1993-03-29 | 2001-05-15 | Matsushita Electric Industrial Co., Ltd. | Magneto-optical element and optical magnetic field sensor |
| EP1176427A2 (en) * | 1993-03-29 | 2002-01-30 | Matsushita Electric Industrial Co., Ltd. | Magneto-optical element and optical magnetic field sensor |
| EP1176427A3 (en) * | 1993-03-29 | 2002-07-03 | Matsushita Electric Industrial Co., Ltd. | Magneto-optical element and optical magnetic field sensor |
| JP2008523401A (en) * | 2004-12-13 | 2008-07-03 | シュランベルジェ、ホールディング、リミテッド | Magneto-optic sensor |
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