JPS62150170A - Optical fiber applied sensor - Google Patents
Optical fiber applied sensorInfo
- Publication number
- JPS62150170A JPS62150170A JP60291639A JP29163985A JPS62150170A JP S62150170 A JPS62150170 A JP S62150170A JP 60291639 A JP60291639 A JP 60291639A JP 29163985 A JP29163985 A JP 29163985A JP S62150170 A JPS62150170 A JP S62150170A
- Authority
- JP
- Japan
- Prior art keywords
- measured
- optical fiber
- light
- voltage
- electrical signal
- 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.)
- Granted
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、被測定物理量を光学的手段を用いて検知する
光ファイバ応用センサに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical fiber applied sensor that detects a physical quantity to be measured using optical means.
従来の技術
従来の偏波面保存光ファイバを使用した光ファイバ応用
センサは、例えば「オプトロニクス、１９８３．１月号
、Ｐ３１、図−１３」に示されているように第２図のよ
うな構成となっており、被測定物理量は電流の場合であ
る。2. Prior Art A conventional optical fiber applied sensor using a polarization maintaining optical fiber has a configuration as shown in Fig. 2, as shown in "Optronics, January 1983 issue, P31, Fig. In this case, the physical quantity to be measured is electric current.
すなわち、光源部からの出射光１は偏光子２で直線偏光
となり、レンズ２で偏波面保存光ファイバ３に集光され
る。この時、偏波面保存光ファイバ３の偏光固有軸と直
線偏光軸とを一致させる。That is, the light 1 emitted from the light source section becomes linearly polarized light by the polarizer 2, and is focused by the lens 2 onto the polarization-maintaining optical fiber 3. At this time, the polarization eigenaxis of the polarization-maintaining optical fiber 3 is made to coincide with the linear polarization axis.
偏波面保存光ファイバ３の偏光固有軸に沿って伝搬した
直線偏光はレンズ４で平行光となり磁気光学素子５を透
過する。この時、直線偏光は被測定電流により生じる磁
界Ｈにより偏光方向が回転し楕円偏光となり、レンズ６
で偏波面保存光ファイバ７に入射される。ここで、磁界
Ｈが０のときの直線偏光方向を、偏波保存光ファイバの
偏光固有軸に対して４５°の角度で入射する。この楕円
偏光の光は、偏波面保存光ファイバ７を伝搬後、偏光ビ
ームスプリッタ９により直角２成分のベクトル光に分光
され各々受光部１０で受光し、電気的に演算処理を行な
い被測定電流値を求めるものである。The linearly polarized light propagated along the polarization eigenaxis of the polarization-maintaining optical fiber 3 is turned into parallel light by the lens 4 and transmitted through the magneto-optical element 5 . At this time, the polarization direction of the linearly polarized light is rotated by the magnetic field H generated by the current to be measured, and it becomes elliptically polarized light, and the lens 6
and enters the polarization maintaining optical fiber 7. Here, the linear polarization direction when the magnetic field H is 0 is incident at an angle of 45° with respect to the polarization eigenaxis of the polarization maintaining optical fiber. After propagating through the polarization-maintaining optical fiber 7, this elliptically polarized light is split into vector lights of two orthogonal components by the polarization beam splitter 9, each of which is received by the light receiving section 10, and electrically processed to obtain the measured current value. This is what we seek.
発明が解決しようをする問題点
一般的に、偏波面保存光ファイバは、互いに直交する固
有軸の各々の方向での伝般定数の温度特性、あるいはフ
ァイバのゆらぎなどの外圧による位相変化に差があるた
め、楕円偏光のように直交する固有軸の双方に偏光成分
を有する光の場合、周囲温度の変化やファイバのゆらぎ
などの外圧の変化によっても位相が変化する。Problems to be Solved by the Invention In general, polarization-maintaining optical fibers have differences in the temperature characteristics of the transfer constant in each direction of their mutually orthogonal eigenaxes, or in the phase change due to external pressure such as fiber fluctuation. Therefore, in the case of light having polarization components on both orthogonal eigenaxes, such as elliptically polarized light, the phase changes due to changes in external pressure such as changes in ambient temperature and fiber fluctuations.
このため、上記のような方法では、偏波面保存光ファイ
バ７を伝搬する光は磁界で位相変調を受けた楕円偏光で
あり、伝搬する間に周囲温度変化等による位相変化をも
受けることになり、電流の情報を正確に検知することか
困難となる。Therefore, in the method described above, the light propagating through the polarization-maintaining optical fiber 7 is elliptically polarized light that has been phase-modulated by the magnetic field, and during propagation it is also subject to phase changes due to changes in ambient temperature, etc. , it becomes difficult to accurately detect current information.
問題点を解決するだめの手段
本発明は、上記の問題点を解決するために、被測定物理
量以外の物理量の変化により、偏波面保存光ファイバを
透過する光の位相が変調される周波数範囲と異なった周
波数範囲を有する被測定物理量の変化に応じて、透過す
る光の位相を変調する機能を有する光学素子と、偏波面
保存光ファイバを有し、被測定物理量の変化に応じて位
相変調された光信号を受光部で電気信号に変換し、前記
被測定物理量の変化の周波数範囲のみを電気的に分離し
て取り出すものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a frequency range in which the phase of light transmitted through a polarization-maintaining optical fiber is modulated by a change in a physical quantity other than the physical quantity to be measured. It has an optical element that has the function of modulating the phase of transmitted light according to changes in the physical quantity to be measured, which has different frequency ranges, and a polarization-maintaining optical fiber. A light receiving section converts the optical signal into an electrical signal, and electrically separates and extracts only the frequency range of the change in the physical quantity to be measured.
作用
本発明は、上記の方法により、温度変化など７）周囲の
環境の変化に影響されずに被測定物理量の検知を正確に
行なうものである。Operation The present invention uses the method described above to accurately detect a physical quantity to be measured without being affected by changes in the surrounding environment such as temperature changes.
実施例
第１図に本発明の光ファイバ応用センサの一実施例とし
て商用周波数（６０Ｈ２，６０Ｈ２）を有する電圧を検
知する光ファイバ応用電圧センサについて示す。Embodiment FIG. 1 shows an optical fiber applied voltage sensor for detecting voltage having a commercial frequency (60H2, 60H2) as an embodiment of the optical fiber applied sensor of the present invention.
光源１２からの出射光は偏光子１４で直線偏光となりレ
ンズ１３で偏波面保存光ファイバ１５に集光し伝搬され
、レンズ１θで平行光となり、電気光学素子１７を透過
する。この時、直線偏光は被測定電圧Ｖにより位相変調
を受は楕円偏光となりレンズ１８で偏波面保存光ファイ
バ１９に集光され伝搬し、偏光ビームスプリッタ２１を
透過することにより、被測定電圧に比例した光強度信号
となり、レンズ２ｏで受光素子２２に集光し、電気信号
処理部２３にて電気信号に変換される。ここで、偏光ビ
ームスプリッタ１９を伝搬する光は、偏波面保存光ファ
イバの直交する固有軸の双方に偏光成分を有する楕円偏
光であり、周囲の温度変化により位相の変化が生じるが
、この位相変化の周波数範囲は通常、数Ｈｚ程度であり
、被測定電圧の周波数（５０Ｈｚ、又は６０Ｈｚ ）と
を電気的に分離することが可能であり、電気信号に変換
後、電気信号処理部２３で各４・の周波数を分離し、被
測定電圧の周波数成分だけを取り出し、被測定電圧の正
確な値を検知するものである。The light emitted from the light source 12 becomes linearly polarized light by the polarizer 14, is condensed into the polarization-maintaining optical fiber 15 by the lens 13, and propagated, becomes parallel light by the lens 1θ, and is transmitted through the electro-optical element 17. At this time, the linearly polarized light undergoes phase modulation by the voltage to be measured V, and becomes elliptically polarized light, which is focused by the lens 18 onto the polarization-maintaining optical fiber 19 and propagated, and is transmitted through the polarizing beam splitter 21, which is proportional to the voltage to be measured. The light intensity signal is focused on the light receiving element 22 by the lens 2o, and converted into an electric signal by the electric signal processing section 23. Here, the light propagating through the polarization beam splitter 19 is elliptically polarized light having polarization components on both orthogonal eigenaxes of the polarization-maintaining optical fiber, and a change in phase occurs due to a change in ambient temperature; The frequency range of is usually about several Hz, and it is possible to electrically separate it from the frequency of the voltage to be measured (50Hz or 60Hz), and after converting it to an electrical signal, the electrical signal processing section 23・The frequency of the voltage to be measured is separated, and only the frequency component of the voltage to be measured is extracted to detect the accurate value of the voltage to be measured.
発明の効果
以北述べてきたように、本発明によれば、被測定物理量
の変化に応じて位相変調された光信号を受光部で電気信
号に変換後、周囲の温度変化などにより偏波面保存光フ
ァイバが受けた位相変化成分を電り的に分離し、被測定
物理量の変化成分だけを取り出し、正確な値を検知する
ことができる。Effects of the Invention As described above, according to the present invention, after converting an optical signal that is phase-modulated in accordance with changes in the physical quantity to be measured into an electrical signal in the light receiving section, the plane of polarization is preserved due to changes in ambient temperature, etc. By electrically separating the phase change component received by the optical fiber and extracting only the change component of the physical quantity to be measured, accurate values can be detected.
第１図は、本発明の一実施例における光ファイバ応用セ
ンザの構成図、第２図は従来の光ファイバ応用センサの
構成図である。
１１・・・・・・偏光子、１２・旧・・光源部、１３．
１θ、１８．２ｏ・・・・・・レンズ、１４．２１・・
・・・・偏光ビームスプリッタ、１５．１９・・・・・
・偏波面保存光ファイバ、１７・・・・・・電気光学素
子、２２・・・・・・受光部、２３・・・・・・電気信
号処理部。FIG. 1 is a block diagram of an optical fiber applied sensor according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional optical fiber applied sensor. 11...Polarizer, 12. Old...Light source section, 13.
1θ, 18.2o...Lens, 14.21...
...Polarizing beam splitter, 15.19...
- Polarization maintaining optical fiber, 17... Electro-optical element, 22... Light receiving section, 23... Electric signal processing section.
Claims (1)
ファイバを透過する光の位相が変調される周波数範囲と
異なった周波数範囲を有する被測定物理量の変化に応じ
て、透過する光の位相を変調する機能を有する光学素子
と、偏波面保存光ファイバを有し、前記被測定物理量の
変化に応じて位相変調された光信号を受光部で電気信号
に変換し、前記被測定物理量の変化の周波数範囲のみを
電気的に分離して取り出すように構成した光ファイバ応
用センサ。Modulates the phase of light passing through a polarization-maintaining optical fiber according to changes in a physical quantity to be measured, which has a frequency range that is different from the frequency range in which the phase of light passing through a polarization-maintaining optical fiber is modulated by a change in a physical quantity other than the physical quantity to be measured. and a polarization-maintaining optical fiber, which converts an optical signal that is phase-modulated according to the change in the physical quantity to be measured into an electrical signal in a light receiving section, and calculates the frequency of the change in the physical quantity to be measured. Optical fiber applied sensor configured to electrically isolate and extract only the range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60291639A JPH06100619B2 (en) | 1985-12-24 | 1985-12-24 | Optical fiber sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60291639A JPH06100619B2 (en) | 1985-12-24 | 1985-12-24 | Optical fiber sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62150170A true JPS62150170A (en) | 1987-07-04 |
| JPH06100619B2 JPH06100619B2 (en) | 1994-12-12 |
Family
ID=17771551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60291639A Expired - Lifetime JPH06100619B2 (en) | 1985-12-24 | 1985-12-24 | Optical fiber sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06100619B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0415073U (en) * | 1990-05-25 | 1992-02-06 | ||
| EP0599181A2 (en) * | 1992-11-20 | 1994-06-01 | Matsushita Electric Industrial Co., Ltd. | Voltage sensor |
| EP0696739A3 (en) * | 1994-08-12 | 1997-03-05 | Matsushita Electric Ind Co Ltd | Optical sensor |
| US6057678A (en) * | 1997-11-28 | 2000-05-02 | Matsushita Electric Industrial Co., Ltd. | Optical sensor apparatus and signal processing circuit used therein including initialization and measuring modes |
| JP2013164312A (en) * | 2012-02-10 | 2013-08-22 | Seiko Epson Corp | Magnetic field measurement device |
-
1985
- 1985-12-24 JP JP60291639A patent/JPH06100619B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0415073U (en) * | 1990-05-25 | 1992-02-06 | ||
| EP0599181A2 (en) * | 1992-11-20 | 1994-06-01 | Matsushita Electric Industrial Co., Ltd. | Voltage sensor |
| EP0599181A3 (en) * | 1992-11-20 | 1995-03-08 | Matsushita Electric Ind Co Ltd | Voltage sensor. |
| US5477134A (en) * | 1992-11-20 | 1995-12-19 | Matsushita Electric Industrial Co., Ltd. | Voltage sensor for use in optical power transformer including a pair of Pockels cells |
| EP0696739A3 (en) * | 1994-08-12 | 1997-03-05 | Matsushita Electric Ind Co Ltd | Optical sensor |
| US5635829A (en) * | 1994-08-12 | 1997-06-03 | Matsushita Electric Industrial Co., Ltd. | Optical sensor |
| US6057678A (en) * | 1997-11-28 | 2000-05-02 | Matsushita Electric Industrial Co., Ltd. | Optical sensor apparatus and signal processing circuit used therein including initialization and measuring modes |
| JP2013164312A (en) * | 2012-02-10 | 2013-08-22 | Seiko Epson Corp | Magnetic field measurement device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06100619B2 (en) | 1994-12-12 |
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