基于法拉第效应、采用稀土铁石榴石薄膜的小型光学磁场传感器。

Small optical magnetic-field sensor that uses rare-Earth iron garnet films based on the faraday effect.

作者信息

Itoh N, Minemoto H, Ishiko D, Ishizuka S

机构信息

Multimedia Systems Research Laboratory, Matsushita Electric Industrial, 3-1-1 Yagumo-nakamachi, Moriguchi, Osaka 570-8501, Japan.

出版信息

Appl Opt. 1999 Apr 1;38(10):2047-52. doi: 10.1364/ao.38.002047.

DOI:10.1364/ao.38.002047

PMID:18319762

Abstract

Highly accurate optical magnetic-field probe sensors that use iron garnet films have been developed. New probe-type sensors were designed with a confocal optical system. A new garnet composition, Bi(0.98)Gd(0.92)La(0.03)Y(1.07)Fe(4.72)Ga(0.28)O(12), was found that shows high temperature stability for a sensitivity of less than 2.0% from -20 to +80 degrees C. The linearity error of the sensor output was within 1.0% for alternating magnetic fields from 0.3 to 42 mT. An optical current transformer that uses the proposed sensor has an ac linearity of 1.0% for input current up to nearly 300 A. The sensor realized high performance in actual use.

摘要

已开发出使用铁石榴石薄膜的高精度光磁场探头传感器。采用共焦光学系统设计了新型探头式传感器。发现一种新的石榴石成分Bi(0.98)Gd(0.92)La(0.03)Y(1.07)Fe(4.72)Ga(0.28)O(12)，在-20至+80摄氏度范围内，其灵敏度具有高温稳定性，变化小于2.0%。对于0.3至42 mT的交变磁场，传感器输出的线性误差在1.0%以内。使用该传感器的光学电流互感器在输入电流高达近300 A时，交流线性度为1.0%。该传感器在实际应用中实现了高性能。