JPH0743395A - Optical interference voltage sensor - Google Patents
Optical interference voltage sensorInfo
- Publication number
- JPH0743395A JPH0743395A JP20586393A JP20586393A JPH0743395A JP H0743395 A JPH0743395 A JP H0743395A JP 20586393 A JP20586393 A JP 20586393A JP 20586393 A JP20586393 A JP 20586393A JP H0743395 A JPH0743395 A JP H0743395A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- piezoelectric element
- signal
- light
- voltage
- 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 abstract description 9
- 239000013307 optical fiber Substances 0.000 claims abstract description 27
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
(57)【要約】
【目的】 光干渉型電圧センサにおいて、検知感度を向
上させると共に、特定周波数の電圧成分を計測する。
【構成】 圧電素子３に信号用光ファイバ４を付設し、
この光を参照用光ファイバ５の光と干渉させ、電圧信号
の印加に伴う圧電素子３の共振振動により信号用光ファ
イバの光に生じる位相変化を光強度の変化としてとらえ
て電圧信号強度を計測する。圧電素子の共振を利用して
いるため信号用光ファイバの位相変化も大きく感度が高
い。また、圧電素子の共振周波数を計測しようとする電
圧信号の特定周波数と等しくすることで特定周波数の電
圧成分を計測することができる。
(57) [Abstract] [Purpose] In an optical interference voltage sensor, it improves the detection sensitivity and measures the voltage component of a specific frequency. [Configuration] A signal optical fiber 4 is attached to the piezoelectric element 3,
This light is made to interfere with the light of the reference optical fiber 5, and the voltage change is measured by grasping the phase change generated in the light of the signal optical fiber due to the resonance vibration of the piezoelectric element 3 accompanying the application of the voltage signal as the change of the light intensity. To do. Since the resonance of the piezoelectric element is used, the phase change of the signal optical fiber is large and the sensitivity is high. Further, by making the resonance frequency of the piezoelectric element equal to the specific frequency of the voltage signal to be measured, the voltage component of the specific frequency can be measured.
Description
【０００１】[0001]
【産業上の利用分野】本発明は電圧信号における特定の
周波数成分を計測するための装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring a specific frequency component in a voltage signal.
【０００２】[0002]
【従来の技術】従来、光の干渉現象を利用して電圧を測
定する装置としては、例えば「光エレクトロニクスハン
ドブック」のP759〜760に示されるものがある。これは
電歪素子の周囲に単一モード光ファイバペロー干渉計を
巻き付け、電圧印加により光路差が半波長変化するごと
に発生する光パルス数をカウントすることで電圧を計測
する技術である。2. Description of the Related Art Conventionally, as an apparatus for measuring a voltage by utilizing an interference phenomenon of light, there is, for example, one shown in P759 to 760 of "Optical Electronics Handbook". In this technique, a single-mode optical fiber Perot interferometer is wound around an electrostrictive element, and the voltage is measured by counting the number of light pulses generated each time the optical path difference changes by half a wavelength by applying a voltage.
【０００３】[0003]
【発明が解決しようとする課題】しかし、この技術は半
波長の光路差ごとに発生する光パルスをカウントするこ
とで電圧を計測するため、測定精度を半波長の光路差以
下にすることができない。又、電圧信号のある特定の周
波数信号を直接取り出して計測することも困難である。However, in this technique, the voltage is measured by counting the optical pulses generated for each half-wavelength optical path difference, so that the measurement accuracy cannot be made equal to or less than the half-wavelength optical path difference. . It is also difficult to directly extract and measure a specific frequency signal of the voltage signal.
【０００４】[0004]
【課題を解決するための手段】本発明はこのような課題
を解消するためになされたもので、その特徴は圧電素子
に付設された信号用光ファイバの光を参照用光ファイバ
の光と干渉させ、電圧信号の印加に伴う圧電素子の共振
振動により信号用光ファイバの光に生じる位相変化を光
強度の変化としてとらえて電圧信号強度を計測するセン
サであって、圧電素子の共振周波数を計測しようとする
電圧信号の特定周波数と等しくすることにある。The present invention has been made in order to solve such a problem, and its characteristic is that the light of the signal optical fiber attached to the piezoelectric element interferes with the light of the reference optical fiber. A sensor that measures the voltage signal strength by detecting the phase change that occurs in the light of the signal optical fiber due to the resonance vibration of the piezoelectric element due to the application of the voltage signal as the change in the light intensity, and measures the resonance frequency of the piezoelectric element. It is to make it equal to the specific frequency of the voltage signal to be obtained.
【０００５】[0005]
【作用】即ち、本発明は光パルスのカウントではなく、
干渉計における信号光と参照光の光路差（位相差）によ
り生じる干渉光の強度変化から電圧を計測し、測定精度
の向上を図っている。又、圧電素子が共振周波数におい
て大きな変化を示す性質を利用して、電圧信号の特定周
波数成分を計測できるようにした。In other words, the present invention does not count optical pulses,
The voltage is measured from the intensity change of the interference light caused by the optical path difference (phase difference) between the signal light and the reference light in the interferometer to improve the measurement accuracy. In addition, it is possible to measure the specific frequency component of the voltage signal by utilizing the property that the piezoelectric element greatly changes in resonance frequency.
【０００６】図１は本発明センサを示すもので、いわゆ
るマッハツェンダ型干渉計を利用している。光源１から
の光は光ファイバカプラ２を介して分けられ、一方は圧
電素子３に巻回された信号用光ファイバ４に、他方は参
照用光ファイバ５に送られる。FIG. 1 shows the sensor of the present invention, which utilizes a so-called Mach-Zehnder interferometer. Light from the light source 1 is split via an optical fiber coupler 2, one of which is sent to a signal optical fiber 4 wound around a piezoelectric element 3 and the other of which is sent to a reference optical fiber 5.
【０００７】圧電素子３は共振周波数ｆｒの円筒形のも
ので、電圧信号が印加された際、その信号に周波数ｆｒ
の成分が含まれていると共振を起こし、径方向への大き
な振動を生じる。これにより、圧電素子３の外周に巻回
された信号用光ファイバ４も周波数ｆｒで伸縮し、内部
を通る信号光の位相が同周波数で変化する。ここで、再
度光ファイバカプラ６を介して信号光と参照光を合波し
て干渉させ、干渉光を光電変換器７で電気信号に変換す
ると、前記位相変化は周波数ｆｒの信号として得られ、
この信号の振幅が圧電素子に印加された電圧における周
波数ｆｒの成分強度を示す。The piezoelectric element 3 is of a cylindrical shape having a resonance frequency fr, and when a voltage signal is applied, the signal has a frequency fr.
When the component of is included, resonance occurs and a large vibration occurs in the radial direction. As a result, the signal optical fiber 4 wound around the outer periphery of the piezoelectric element 3 also expands and contracts at the frequency fr, and the phase of the signal light passing through the inside changes at the same frequency. Here, when the signal light and the reference light are combined again through the optical fiber coupler 6 to cause interference and the interference light is converted into an electric signal by the photoelectric converter 7, the phase change is obtained as a signal of frequency fr,
The amplitude of this signal indicates the component strength of the frequency fr in the voltage applied to the piezoelectric element.
【０００８】このように、圧電素子の共振現象を利用し
たことで電圧の印加により生じる歪み量が大きく、信号
光の位相変化量も大きいため高い感度を得ることができ
る。尚、位相変化量は圧電素子への光ファイバの巻回数
に比例するため、巻回数を増やすことで感度をコントロ
ールできる。As described above, since the resonance phenomenon of the piezoelectric element is used, the amount of distortion caused by the application of voltage is large and the amount of phase change of the signal light is also large, so that high sensitivity can be obtained. Since the phase change amount is proportional to the number of windings of the optical fiber around the piezoelectric element, the sensitivity can be controlled by increasing the number of windings.
【０００９】また、圧電素子の共振周波数を変えること
で計測する電気信号の周波数を変えることができ、信号
用光ファイバに共振周波数の異なる複数の圧電素子を取
り付ければ複数の周波数成分の電圧計測ができる。Further, the frequency of the electric signal to be measured can be changed by changing the resonance frequency of the piezoelectric element, and if a plurality of piezoelectric elements having different resonance frequencies are attached to the signal optical fiber, the voltage of a plurality of frequency components can be measured. it can.
【００１０】[0010]
【実施例】以下、本発明の実施例について説明する。先
に説明した図１のセンサを用いて電圧測定を行った。用
いた光源はレーザダイオード（波長１．３μｍ）で、信
号用光ファイバと参照用光ファイバの長さはほぼ等し
い。又、圧電素子に巻回された部分の信号用光ファイバ
は、外径φ０．２５ｍｍでＵＶ樹脂被覆が施されたもの
である。一方、圧電素子は共振周波数３０ｋＨｚ，外径
φ３５ｍｍの円筒形のもので、これに信号用光ファイバ
を１回巻回した。圧電素子にパルス状の電圧を加えたと
きの光電変換器からの出力は、図２に示すように３０ｋ
Ｈｚの周波数信号を示し、その振幅Ｖ2 は印加電圧値Ｖ
1 に比例する。尚、測定対象の電圧信号は圧電素子の共
振周波数と等しい周波数の成分を含んでいれば測定で
き、本実施例のようにパルス状のものに限定されるわけ
ではない。EXAMPLES Examples of the present invention will be described below. Voltage measurement was performed using the sensor of FIG. 1 described above. The light source used is a laser diode (wavelength: 1.3 μm), and the signal optical fiber and the reference optical fiber have substantially the same length. The signal optical fiber wound around the piezoelectric element has an outer diameter of 0.25 mm and is coated with UV resin. On the other hand, the piezoelectric element has a cylindrical shape with a resonance frequency of 30 kHz and an outer diameter of φ35 mm, and a signal optical fiber is wound around it once. The output from the photoelectric converter when a pulsed voltage is applied to the piezoelectric element is 30 k as shown in FIG.
Shows a frequency signal of Hz, and its amplitude V 2 is the applied voltage value V
Proportional to 1 . The voltage signal to be measured can be measured as long as it includes a component having a frequency equal to the resonance frequency of the piezoelectric element, and is not limited to the pulse-shaped one as in the present embodiment.
【００１１】[0011]
【発明の効果】以上説明したように、本発明センサによ
れば高感度にて電圧を計測することができる。特に圧電
素子の共振周波数を変えることで種々の周波数成分の電
圧を計測でき、これを複数取り付ければ複数の周波数成
分を計測できる。また、信号用光ファイバの圧電素子へ
の巻回数を変えることで感度もコントロールできるため
極めて便利である。従って、電力ケーブルにおける部分
放電により発生する電圧測定など、周囲に電気ノイズの
多い環境において有効利用できる。As described above, according to the sensor of the present invention, voltage can be measured with high sensitivity. In particular, the voltage of various frequency components can be measured by changing the resonance frequency of the piezoelectric element, and a plurality of frequency components can be measured by attaching a plurality of them. Further, the sensitivity can be controlled by changing the number of windings of the signal optical fiber around the piezoelectric element, which is extremely convenient. Therefore, it can be effectively used in an environment where there is a lot of electrical noise in the surroundings such as voltage measurement caused by partial discharge in the power cable.
【図１】本発明センサの概略を示す構成図。FIG. 1 is a configuration diagram showing an outline of a sensor of the present invention.
【図２】実施例の計測における、圧電素子への印加電圧
と光電変換器からの出力信号の関係を示すグラフ。FIG. 2 is a graph showing the relationship between the voltage applied to the piezoelectric element and the output signal from the photoelectric converter in the measurement of the example.
１ 光源 ２ 光ファイバカプラ ３ 圧電素子 ４ 信号用光ファイバ ５ 参照用光ファイバ ６ 光ファイバカプラ ７ 光電変換器 1 light source 2 optical fiber coupler 3 piezoelectric element 4 signal optical fiber 5 reference optical fiber 6 optical fiber coupler 7 photoelectric converter
Claims (1)
の光を参照用光ファイバの光と干渉させ、電圧信号の印
加に伴う圧電素子の共振振動により信号用光ファイバの
光に生じる位相変化を光強度の変化としてとらえて電圧
信号強度を計測するセンサであって、前記圧電素子の共
振周波数を計測しようとする電圧信号の特定周波数と等
しくすることを特徴とする光干渉型電圧センサ。1. A phase change caused in the light of the signal optical fiber by causing the light of the signal optical fiber attached to the piezoelectric element to interfere with the light of the reference optical fiber and causing resonance vibration of the piezoelectric element accompanying the application of a voltage signal. Is a sensor for measuring the voltage signal strength by observing as a change in light intensity, and the resonance frequency of the piezoelectric element is made equal to a specific frequency of the voltage signal to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20586393A JPH0743395A (en) | 1993-07-27 | 1993-07-27 | Optical interference voltage sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20586393A JPH0743395A (en) | 1993-07-27 | 1993-07-27 | Optical interference voltage sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0743395A true JPH0743395A (en) | 1995-02-14 |
Family
ID=16513973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20586393A Pending JPH0743395A (en) | 1993-07-27 | 1993-07-27 | Optical interference voltage sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743395A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100327975B1 (en) * | 2000-01-07 | 2002-03-15 | 권영한 | Electrostatic Force Detecting Sensor and Optical Fiber Voltage Measuring Apparatus using the same |
| CN102721853A (en) * | 2012-07-02 | 2012-10-10 | 昆明理工大学 | Optical fiber Bragg grating voltage sensor based on Rogowski coil |
-
1993
- 1993-07-27 JP JP20586393A patent/JPH0743395A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100327975B1 (en) * | 2000-01-07 | 2002-03-15 | 권영한 | Electrostatic Force Detecting Sensor and Optical Fiber Voltage Measuring Apparatus using the same |
| CN102721853A (en) * | 2012-07-02 | 2012-10-10 | 昆明理工大学 | Optical fiber Bragg grating voltage sensor based on Rogowski coil |
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