Correa Noemí, Chuaqui Hernán, Wyndham Edmund, Veloso Felipe, Valenzuela Julio, Favre Mario, Bhuyan Heman
Pontificia Universidad Católica de Chile, Departamento de Física Av. Vicuña Mackenna 4860, Casilla 306, Santiago 22, Chile.
Appl Opt. 2012 Feb 20;51(6):758-62. doi: 10.1364/AO.51.000758.
The design of an optical current sensor to be used in a pulsed power generator is presented. The current sensor is based on the polarization rotation by the Faraday effect. GEPOPU is a pulsed power generator, 110 kA, 120 ns double transit time, 1.5 Ω coaxial geometry, and current rise time of 50 ns. Two different optical geometries surrounding the conductor were tried, using Amici roof prism and pentaprism to go around the current once, as a way to preserve the state of polarization along the optical path by means of complementary reflections within the sensing element. We believe this to be the first time that such large and rapidly varying currents have been measured with this configuration. The values obtained for both geometries agree with the values obtained with a Rogowski coil. The traces obtained are completely noise-free and no significant time lag has been observed between the current determined from the Faraday rotation and the current measured using a Rogowski coil.
介绍了一种用于脉冲功率发生器的光学电流传感器的设计。该电流传感器基于法拉第效应引起的偏振旋转。GEPOPU是一台脉冲功率发生器，输出电流110 kA，双渡越时间120 ns，同轴几何结构电阻1.5 Ω，电流上升时间50 ns。尝试了两种围绕导体的不同光学结构，使用阿米西屋脊棱镜和五角棱镜使光路环绕电流一次，以此通过传感元件内的互补反射来保持沿光路的偏振状态。我们认为这是首次用这种配置测量如此大且快速变化的电流。两种结构获得的值与用罗果夫斯基线圈获得的值一致。获得的迹线完全无噪声，并且在由法拉第旋转确定的电流与使用罗果夫斯基线圈测量的电流之间未观察到明显的时间滞后。
