Measurement of the Velocity of Particles Emerging from a Plasma Flame by High-Speed Cine-Streak Photography

Glass beads of 30- to 140-μm diameter and 50 to 100 m/s velocity emerging from a plasma flame (10,000 K) were photographed using a 16mm high-speed ciné camera in streak mode. The combined radiation from the hot particles and that reflected from the flame provided sufficient light intensity using 400 ASA reversal film. The narrow depth of field (±5 mm) was investigated using an illuminated spinning disc having a hole the same size as the particle. A stereo streak system was devised for particle location in two dimensions. Ghost images caused by internal lens reflection were identified on the film. A simple system for film analyzing was built and a semiautomatic electrical disc analog for measuring streak angle was devised and tested. Overall optical resolution was sufficient to enable particle accelerations (2,000 g) to be estimated from the changes of streak angle across the film.

Print ISSN

0361-4573

Published

1971-12

Content type

Original Research

DOI

10.5594/J05687