Abstract
Arc plasmas are common and important phenomena, which have been widely used in scientific research and industrial fields. It is a non-intrusive way to understand the dynamic characteristics of arc plasma by measuring magnetic field distribution and applying inverse method. Aiming to investigate the motion characteristics of arc plasma, a high-speed magneto-optical imaging system was developed, which mainly consists of a laser-driven light source, achromatic collimator, beam expander, polarized beam splitter, analyzer and high-speed camera. The calibration experiment of the system, which was conducted using a Faraday indicator with a Verdet constant of -96 rad/(T·m)@632.8 nm and Helmholtz coils, shows its magnetic sensitivity reaches 1 mT, spatial resolution is about 500μm, temporal resolution is 100μs as for a circular measuring area of 42 mm in diameter. The arcing experimental results also demonstrate that the developed system can obtain the 2D magnetic field distribution in real time with relatively high spatial and temporal resolution and reasonable magnetic sensitivity. It also provides an effective method to study the motion characteristics of arc plasma inside of an enclosed chamber.
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