公开(公告)号：US4564754A

公开(公告)日：1986-01-14

申请号：US472834

申请日：1983-03-07

申请人： Tadashi Sato ,  Genji Takahashi ,  Yoshiaki Inui

发明人： Tadashi Sato ,  Genji Takahashi ,  Yoshiaki Inui

IPC分类号： G01R15/24 ,  G02F1/01 ,  H01J40/14

CPC分类号： G01R15/246

摘要： A current is measured by making use of a rotation of polarization plane in a magnetic field, that is, a Faraday effect. A conductor under measurement is transversely inserted into a center opening of a Faraday effect glass which has at least two total reflection areas on a periphery thereof so that a light directed into the Faraday effect glass is circulated around the conductor and emitted externally. The light emitted from the Faraday effect glass is split into at least two light beams, which are converted to electric signals by photoelectric elements, and A.C. components contained in the electric signals are extracted and compared. The electric signals are corrected based on the comparison result.The present measuring apparatus and method attain high precision current measurement in a stable manner over an extended period.

摘要翻译： 通过利用磁场中的偏振面的旋转，即法拉第效应来测量电流。 测量导体横向插入法拉第效应玻璃的中心开口，法拉第效应玻璃的周边至少有两个全反射区域，使得导入法拉第效应玻璃的光在导体周围循环并向外发射。 从法拉第效应玻璃发射的光被分成至少两个光束，其被光电元件转换成电信号，并且包含在电信号中的交流分量被提取和比较。 电信号根据比较结果进行校正。 本测量装置和方法在长时间内以稳定的方式实现高精度电流测量。

公开(公告)号：US5153427A

公开(公告)日：1992-10-06

申请号：US667330

申请日：1991-03-11

申请人： Genji Takahashi ,  Kazuyuki Seino ,  Sadamu Saito ,  Tadashi Sato ,  Etsunori Mori ,  Kiyoshi Kurosawa ,  Yoshinori Shirai

发明人： Genji Takahashi ,  Kazuyuki Seino ,  Sadamu Saito ,  Tadashi Sato ,  Etsunori Mori ,  Kiyoshi Kurosawa ,  Yoshinori Shirai

IPC分类号： G01R15/24 ,  G01R19/00

CPC分类号： G01R15/242

摘要： An optical d.c. voltage transformer having an electrooptic medium to which a d.c. electrical field or voltage to be measured is to be applied. The electrooptic medium affects the polarized light from the polarizer by an electrooptical effect to a degree proportional to the strength of the electrical field or voltage. The transformer includes a photodetector for producing an optical signal proportional to the affected light received from the electrooptic medium, a device for converting the optical signal from the photodetector into an electrical signal, a chopper for pulsating the electrical field or voltage to be applied to the electrooptic medium, in terms of time, a detector for demodulating the electrical signal from the converting device in synchronism with the pulsated electrical field or voltage, and an output unit for visually presenting the demodulated electrical signal similar in polarity to the electrical field or voltage to be measured.

摘要翻译： 光学直流 具有电光介质的电压变压器， 要施加要测量的电场或电压。 电光介质通过电光效应将来自偏振器的偏振光影响到与电场或电压的强度成比例的程度。 变压器包括用于产生与从电光介质接收的受影响的光成比例的光信号的光电检测器，用于将来自光电检测器的光信号转换为电信号的装置，用于脉动施加到电场的电场或电压的斩波器 电光介质在时间方面与用于与脉动的电场或电压同步地解调来自转换装置的电信号的检测器和用于以与电场或电压极性相似的解调电信号视觉呈现的输出单元 被测量。