Mie scattering based on-line measurement of droplet from vacuum arc

Metal droplet is produced accompanied with vacuum arc discharge, which important to the research of cathode spot and application arc. The comes from crater can reflect physical process spot. However, it will destroy uniformity surface deposition in engineering should be avoided as much possible. measurement metal usually adopts off-line collector, cannot obtain signal whole space singe In order on-line measure droplet, a new method by Mie scattering developed this work, its feasibility investigated. characteristic light titanium computed simulation code. results indicate that beams small are distributed at all angles. With increase diameter, scattered more concentrated forward direction, allows inversion signals droplets different diameters. Then detector designed annuluses. When divided into 35 annuluses, energy coefficient matrix easy solve system has good resolution. experimental setup built preliminary experiment carried out. diameters mainly around 9.8 μm, verifies effectiveness measuring droplets. information not detected, so diameter distribution quite measurement. reason signal-to-noise ratio poor, thereby leading fail obtained effectively. need further optimized.