公开(公告)号：US4933629A

公开(公告)日：1990-06-12

申请号：US376633

申请日：1989-07-07

申请人： Yoshinari Kozuka ,  Yuichi Kakizaki ,  Takayuki Sekiya ,  Hiroaki Abe

发明人： Yoshinari Kozuka ,  Yuichi Kakizaki ,  Takayuki Sekiya ,  Hiroaki Abe

IPC分类号： G01R33/032 ,  G01R15/24 ,  G01R21/06

CPC分类号： G01R15/24

摘要： A method and an apparatus for measuring the strength of an AC electric field or an equivalent voltage, or the strength of an AC magnetic field or an equivalent current, based on a light beam which is transmitted through and thus modulated by an optical sensing head due to the Pockel's and Faraday effects, while the sensing head is exposed to the AC electric and magnetic fields. The sensing head includes an optical material which exhibits the Pockel's effect and an optical material which exhibits the Faraday effect, or includes an optical material which exhibits both the Pockel's and Faraday effects. The modulated beam is applied to a light-sensitive element, which produces an electric output signal. A first and a second component of the electric output signal are retrieved by respective detectors. The first component has a same frequency as that of the electric or magnetic field, while said second component has a frequency which is two times that of said electric or magnetic field. The electric field strength or the voltage, and the magnetic field strength or the current are determined by one and the other of the first and second components, respectively.

公开(公告)号：US5111135A

公开(公告)日：1992-05-05

申请号：US550978

申请日：1990-07-11

申请人： Yoshinari Kozuka ,  Yuichi Kakizaki

发明人： Yoshinari Kozuka ,  Yuichi Kakizaki

IPC分类号： G01R15/24 ,  G01R29/08

CPC分类号： G01R15/242 ,  G01R29/0885

摘要： A method for optically measuring an AC electric field or an AC voltage is disclosed. According to the method, a light beam emitted from a light-emitting portion is transmitted through a sensing head including a Pockel's-effect element while an AC electric field to be measured is applied to the Pockel's-effect element, so that the light beam is modulated by the applied AC electric field. The transmitted light beam is then received by a light-detecting portion, while in turn produces an electric signal corresponding to the received light beam. From the electric signal are selected a first component (E.omega.) having a same angular frequency as that of the AC electric field, and a second component (E.sub.2 .omega.) having an angular frequency which is two times that of the AC electric field. Then, a ratio (E.sub.2 .omega./E.omega.) of the second component to the first component is calculated so as to determine a strength of the AC electric field or a magnitude of the AC voltage which produces the AC electric field, based on the ratio (E.sub.2 .omega.E/.omega.).

摘要翻译： 公开了用于光学测量AC电场或AC电压的方法。 根据该方法，通过包含Pockel效应元件的感测头将发光部分发出的光束透射，同时将待测量的AC电场施加到Pockel效应元件，使得光束为 由施加的交流电场调制。 然后透射光束被光检测部分接收，而又产生对应于接收光束的电信号。 从电信号中选出与AC电场具有相同角度频率的第一分量（Eω）和具有两倍于AC电场的角频率的第二分量（E2ω）。 然后，计算第二分量与第一分量的比（E2ω/Eω），以便根据比例来确定交流电场的强度或产生交流电场的交流电压的大小 （E2ωE /ω）。

公开(公告)号：US5053617A

公开(公告)日：1991-10-01

申请号：US502871

申请日：1990-04-02

申请人： Yuichi Kakizaki ,  Yoshinari Kozuka

发明人： Yuichi Kakizaki ,  Yoshinari Kozuka

IPC分类号： G01R33/032 ,  G01J5/58 ,  G01R15/24

CPC分类号： G01R15/24

摘要： An instrument including a light-emitter for emitting a light beam, a sensing head portion through which the light beam is transmitted, a light-detective element receiving the beam from the head portion, and a detector receiving an electric signal from the light-detective element. The head portion has a thermo-optical element for changing a first component of the light beam with an ambient temperature, and an optical element for changing a second component of the beam with an electric quantity. The electric signal produced by the light-detective element has a first and a second component which correspond to the first and second components of the light beam, respectively. The detector determines the ambient temperature based on the first component of the electric signal, and determines the electric quantity based on the second component of the electric signal. The electric quantity may be an AC magnetic field, a current, an AC electric field or a voltage.

摘要翻译： 一种仪器，包括用于发射光束的发光体，传播光束的感测头部分，从头部接收光束的光检测元件，以及从光检测器接收电信号的检测器 元件。 头部具有用于改变环境温度下的光束的第一分量的热光学元件和用于以电量改变光束的第二分量的光学元件。 由光检测元件产生的电信号分别具有对应于光束的第一和第二分量的第一和第二分量。 检测器基于电信号的第一分量来确定环境温度，并且基于电信号的第二分量来确定电量。 电量可以是交流磁场，电流，交流电场或电压。

公开(公告)号：US5103164A

公开(公告)日：1992-04-07

申请号：US553318

申请日：1990-07-17

申请人： Toshiyuki Kawaguchi ,  Hiroyuki Katsukawa ,  Naoki Tanaka ,  Seigo Yokoi ,  Yuichi Kakizaki

发明人： Toshiyuki Kawaguchi ,  Hiroyuki Katsukawa ,  Naoki Tanaka ,  Seigo Yokoi ,  Yuichi Kakizaki

IPC分类号： G01R15/24

CPC分类号： G01R15/246 ,  G01R15/24

摘要： An optical current transformer particularly useful for a fault location system for a power supply system and substation, including a casing which can be detachably secured to a plurality of wire conductors which conduct currents of the same phase. Within the casing a plurality of Rogowsky coils are arranged such that when the casing is secured to the wire conductors, each Rogowsky coil is wound around respective wire conductors. The Rogowsky coils are connected in series with an air-core coil and an optical current sensor having a Faraday element is arranged within a space of the coil such that the Faraday element is subjected to a magnetic flux generated by the coil. A magnitude of the magnetic flux is optically detected by the Faraday element to measure a total sum of currents conducting along the wire conductors.