JPH08304490A - Electric field sensor - Google Patents
Electric field sensorInfo
- Publication number
- JPH08304490A JPH08304490A JP7138475A JP13847595A JPH08304490A JP H08304490 A JPH08304490 A JP H08304490A JP 7138475 A JP7138475 A JP 7138475A JP 13847595 A JP13847595 A JP 13847595A JP H08304490 A JPH08304490 A JP H08304490A
- Authority
- JP
- Japan
- Prior art keywords
- electric field
- optical modulator
- optical fiber
- package
- conductor rod
- 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
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空間の電界強度を検出
する電界センサに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric field sensor for detecting electric field strength in space.
【０００２】[0002]
【従来の技術】近年、普及が著しいインバーターエアコ
ン等から発生する電磁妨害波により、コンピューターシ
ステム等が誤動作を起こす現象が問題となってきてい
る。これらのＥＭＣ試験、及び対策を行うためには、装
置から放射する、又は装置に進入する電磁妨害波を正確
に測定する必要がある。特に、最近では、電磁パルスの
時間領域における測定、放射電磁界を理論的に求める測
定が必要となっている。2. Description of the Related Art In recent years, there has been a problem that a computer system or the like malfunctions due to an electromagnetic interference wave generated from an inverter air conditioner or the like, which has become very popular. In order to perform these EMC tests and countermeasures, it is necessary to accurately measure the electromagnetic interference waves radiated from the device or entering the device. In particular, recently, it is necessary to measure the electromagnetic pulse in the time domain and to theoretically determine the radiated electromagnetic field.
【０００３】このような必要性から、センサヘッドとレ
ベル測定装置との間を光ファイバで結ぶ電界センサが種
々検討されている。このような電界センサでは、センサ
ヘッドに外部から光ファイバにより無変調の光信号を入
力し、この光信号をセンサ内部の光変調器により、セン
サに接続した導体棒で検出した電界レベルで変調し、こ
の変調した光信号を光ファイバによりレベル測定装置に
伝送する。この電界センサは、センサヘッドと信号線が
すべて非金属であるため、電界分布の乱れを生ずること
がなく、空間の電界強度を高精度に測定することができ
る。Due to such a need, various electric field sensors connecting an optical fiber between the sensor head and the level measuring device have been studied. In such an electric field sensor, an unmodulated optical signal is input to the sensor head from the outside by an optical fiber, and this optical signal is modulated by the optical modulator inside the sensor at the electric field level detected by the conductor rod connected to the sensor. The modulated optical signal is transmitted to the level measuring device via an optical fiber. In this electric field sensor, since the sensor head and the signal line are all made of non-metal, the electric field distribution is not disturbed, and the electric field strength in space can be measured with high accuracy.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、光変調
器を収納するパッケージに固定された導体棒の形状は、
光変調器に対して相対的に大きいこともあり、取り扱い
に注意を払わねばならない。従来の電界センサでは、特
に導体棒は、パッケージに機械的に強固に取り付けら
れ、それ故に、過度の機械的衝撃が加わると、その取り
付け部分、あるいはその周辺が破損しやすく、又、電界
センサに機能低下を招く等、取り扱いが煩わしいもので
あった。その対策として、導体棒を変形しやすい材料で
構成する等、いろいろ試みられてきたが、かかる操作性
の改善にはいたっていない。However, the shape of the conductor rod fixed to the package accommodating the optical modulator is as follows.
Since it is relatively large with respect to the light modulator, it must be handled with care. In the conventional electric field sensor, in particular, the conductor rod is mechanically firmly attached to the package, and therefore, when an excessive mechanical shock is applied, its attachment part or its periphery is easily damaged, and the electric field sensor is It was troublesome to handle, such as a decrease in function. As a countermeasure, various attempts have been made such as forming the conductor rod from a material that is easily deformed, but such operability has not been improved.
【０００５】本発明は、機械的衝撃を受けても、前述し
たような破損、あるいは機能低下を招くことを防止した
電界センサを提供する。The present invention provides an electric field sensor which prevents the above-mentioned damage or functional deterioration even when it receives a mechanical shock.
【０００６】[0006]
【課題を解決するための手段】前述の課題を解決するた
めに、本発明によれば、導体棒と、印加した電圧に依存
して入射した光の強度が変化して出射する光変調器とか
ら構成し、外部電界により導体棒に誘起した電圧に依存
して変化する前記光変調器からの出射光強度によって、
外部電界の強度を測定する電界センサにおいて、導体棒
を弾性体によって前記光変調器のパッケージに固定して
構成した電界センサが得られる。In order to solve the above-mentioned problems, according to the present invention, a conductor rod and an optical modulator that emits light with a change in the intensity of incident light depending on an applied voltage. And the intensity of light emitted from the optical modulator that changes depending on the voltage induced in the conductor rod by an external electric field,
In an electric field sensor for measuring the strength of an external electric field, an electric field sensor is obtained in which a conductor rod is fixed to the package of the optical modulator by an elastic body.
【０００７】[0007]
【作用】光変調器を収納するパッケージに固定して外部
電界を検出する導体棒を、コイルばね、シリコーン樹脂
等の弾性体を使用して固定することにより、外部から機
械的衝撃が加わっても、前記の弾性体の復元力によって
機械的衝撃を吸収して破損せず、又、衝撃が加わった前
後の検出感度に差が生じない。Even if a mechanical shock is applied from the outside, the conductor rod for fixing the optical modulator and detecting the external electric field is fixed by using an elastic body such as a coil spring or silicone resin. Also, the restoring force of the elastic body does not damage the mechanical shock and damage it, and there is no difference in the detection sensitivity before and after the shock is applied.
【０００８】[0008]
【実施例】以下に、本発明を更に実施例によって説明す
る。EXAMPLES The present invention will be described below in greater detail by giving Examples.
【０００９】（実施例１）図１は、本発明の電界センサ
の一実施例の構成を断面図で示したものである。図１に
おいて、パッケージ２に収納された光変調器１には、入
力光ファイバ３及び出力光ファイバ４が接続されてい
る。入力光ファイバ３の他の一端には、光源として、半
導体レーザー（図示せず）を、又、出力光ファイバ４の
他の一端には、光検出器を介してレベル測定装置（いず
れも図示せず）に接続した。パッケージ２の対向する２
面に、それぞれ金属製のコイルばね１１を介して、長さ
１００ｍｍ、直径１ｍｍの真鍮製の導体棒７を固定し
た。外部電界によって導体棒７に誘起された電圧は、リ
ード線９を通じて光変調器１の変調電極（図示せず）に
接続されている。なお、光変調器１には、ニオブ酸リチ
ウム結晶の基板表面に光導波路を構築した導波路干渉型
光変調器を用いた。(Embodiment 1) FIG. 1 is a sectional view showing the construction of an embodiment of the electric field sensor of the present invention. In FIG. 1, an input optical fiber 3 and an output optical fiber 4 are connected to an optical modulator 1 housed in a package 2. A semiconductor laser (not shown) as a light source is provided at the other end of the input optical fiber 3, and a level measuring device (not shown) is provided at the other end of the output optical fiber 4 via a photodetector. Connected). Opposite 2 of package 2
A conductor rod 7 made of brass and having a length of 100 mm and a diameter of 1 mm was fixed to the surface via a coil spring 11 made of metal, respectively. The voltage induced in the conductor rod 7 by the external electric field is connected to the modulation electrode (not shown) of the optical modulator 1 through the lead wire 9. As the optical modulator 1, a waveguide interference type optical modulator in which an optical waveguide is constructed on the surface of a lithium niobate crystal substrate is used.
【００１０】導体棒７に機械的衝撃が加えられた時、コ
イルばね１１が弾性領域で変形して機械的衝撃を吸収
し、導体棒７、導体棒固定部、及びその周辺は、破損が
生じにくい。When a mechanical shock is applied to the conductor rod 7, the coil spring 11 is deformed in the elastic region to absorb the mechanical shock, and the conductor rod 7, the conductor rod fixing portion and its periphery are damaged. Hateful.
【００１１】この電界センサを用いて、周波数１００Ｍ
Ｈｚでの電界の最小検出感度は、９５ｄＢμＶ／ｍであ
った。更に、導体棒に横方向の変位を与えた後、これを
除いて、コイルばねの弾性によって導体棒の構成形状が
復元した後の測定においても、同一の最小検出感度を示
した。Using this electric field sensor, a frequency of 100M
The minimum detection sensitivity of the electric field at Hz was 95 dBμV / m. Further, after the lateral displacement of the conductor rod, the same minimum detection sensitivity was also shown in the measurement after the conductor rod was reconstructed by the elasticity of the coil spring except for this displacement.
【００１２】更に、コイルばねの代わりに、板ばねを用
いても同様に有効であることが認められた。Further, it has been found that a leaf spring may be used instead of the coil spring as well.
【００１３】（実施例２）図２は、本発明の他の実施例
を示す構成図である。図２において、前記実施例１と同
様に、パッケージ２に収納された導波路干渉型の光変調
器１に、入力光ファイバ３及び出力光ファイバ４が接続
されている。入力光ファイバ３の他の一端には、光源と
して、半導体レーザー（図示せず）を、又、出力光ファ
イバ４の他の一端には、光検出器を介してレベル測定装
置（いずれも図示せず）に接続した。パッケージ２の対
向する２面に、それぞれ弾性を示すシリコーン樹脂１３
を介して、長さ１００ｍｍ、直径１ｍｍの真鍮製の導体
棒７を固定した。電界によって導体棒７に誘起された電
圧は、リード線９を通じて光変調器１の変調電極（図示
せず）に接続されている。(Embodiment 2) FIG. 2 is a block diagram showing another embodiment of the present invention. In FIG. 2, as in the first embodiment, an input optical fiber 3 and an output optical fiber 4 are connected to a waveguide interference type optical modulator 1 housed in a package 2. A semiconductor laser (not shown) as a light source is provided at the other end of the input optical fiber 3, and a level measuring device (not shown) is provided at the other end of the output optical fiber 4 via a photodetector. Connected). Silicone resin 13 showing elasticity on each of the two opposing surfaces of the package 2.
The brass conductor rod 7 having a length of 100 mm and a diameter of 1 mm was fixed via the. The voltage induced in the conductor rod 7 by the electric field is connected to the modulation electrode (not shown) of the optical modulator 1 through the lead wire 9.
【００１４】導体棒７に機械的衝撃が加えられた時、シ
リコーン樹脂１３が弾性領域で変形して機械的衝撃を吸
収し、導体棒７、導体棒固定部、及びその周辺は、破損
が生じにくい。When a mechanical shock is applied to the conductor rod 7, the silicone resin 13 is deformed in the elastic region and absorbs the mechanical shock, and the conductor rod 7, the conductor rod fixing portion and its periphery are damaged. Hateful.
【００１５】この電界センサを用いて、周波数１００Ｍ
Ｈｚでの電界の最小検出感度は、９５ｄＢμＶ／ｍであ
った。更に、導体棒に横方向の変位を与えた後、これを
除いて、シリコーン樹脂の弾性によって導体棒の構成形
状が復元した後の測定においても、同一の最小検出感度
を示した。Using this electric field sensor, a frequency of 100M
The minimum detection sensitivity of the electric field at Hz was 95 dBμV / m. Further, after the lateral displacement of the conductor rod, the same minimum detection sensitivity was exhibited in the measurement after the conductor rod was restored to its original shape due to the elasticity of the silicone resin.
【００１６】[0016]
【発明の効果】以上、説明したように、本発明の電界セ
ンサは、耐衝撃性に富み、機械的衝撃に対して破損しに
くく、又、機能低下を招きにくい。As described above, the electric field sensor of the present invention has high impact resistance, is less likely to be damaged by mechanical impact, and is less likely to deteriorate in function.
【００１７】なお、本発明は、前記実施例とは異なる方
式の光変調器を用いた電界センサに対しても、有効性を
損なうことはない。又、１本の導体棒による、いわゆる
モノポールタイプの構成の電界センサにおいても、前記
実施例と同様の効果が得られることは、いうまでもな
い。The present invention does not impair the effectiveness even for an electric field sensor using an optical modulator of a method different from that of the above embodiment. It goes without saying that the same effect as that of the above-described embodiment can be obtained also in the electric field sensor having a so-called monopole type structure using one conductor rod.
【図１】本発明の一実施例の構成を示す断面図。FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention.
【図２】本発明の他の実施例を示す構成を断面図。FIG. 2 is a cross-sectional view of a structure showing another embodiment of the present invention.
１ 光変調器 ２ パッケージ ３ 入力光ファイバ ４ 出力光ファイバ ７ 導体棒 ９ リード線 １１ コイルばね １３ シリコーン樹脂 1 Optical Modulator 2 Package 3 Input Optical Fiber 4 Output Optical Fiber 7 Conductor Rod 9 Lead Wire 11 Coil Spring 13 Silicone Resin
Claims (1)
界により前記導体棒に誘起した電圧に依存して変化する
前記光変調器からの出射光強度によって、外部電界の強
度を測定する電界センサにおいて、前記導体棒を弾性体
によって前記光変調器のパッケージに固定して構成した
ことを特徴とする電界センサ。1. An intensity of an external electric field is measured by an intensity of emitted light from the optical modulator, which is composed of a conductor rod and an optical modulator, and changes depending on a voltage induced in the conductor rod by an external electric field. In the electric field sensor, the conductor rod is fixed to the package of the optical modulator by an elastic body, and the electric field sensor is configured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7138475A JPH08304490A (en) | 1995-05-11 | 1995-05-11 | Electric field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7138475A JPH08304490A (en) | 1995-05-11 | 1995-05-11 | Electric field sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08304490A true JPH08304490A (en) | 1996-11-22 |
Family
ID=15222940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7138475A Pending JPH08304490A (en) | 1995-05-11 | 1995-05-11 | Electric field sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08304490A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633036A (en) * | 2013-08-07 | 2014-03-12 | 中国科学院电子学研究所 | Electric field sensor packaging element based on high-resistance material |
-
1995
- 1995-05-11 JP JP7138475A patent/JPH08304490A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633036A (en) * | 2013-08-07 | 2014-03-12 | 中国科学院电子学研究所 | Electric field sensor packaging element based on high-resistance material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040323 |