Abstract

Afterglow tails of high-density 10-nsec arc channels in 1-atm air have been analyzed to <10⁻³ of peak intensity value, exceeding 500-nsec duration, by employing a gated Kerr cell which protects the photodetector from saturation. Without such protection too high intensities exceeding a factor of 4 were observed. Low-intensity afterglow channels are photographed by superimposed multishot integration. This is possible because of the exceptional stability of such a particular plasma, which is demonstrated. Photoelectric and photographic decay functions agree. Spectral differences are observed and discussed.

© 1964 Optical Society of America

On the Saturation Luminance of High Density Microsecond Arc Channels

Heinz Fischer and Lothar Michel
Appl. Opt. 6(5) 935-937 (1967)

Electrode Phenomena in a High Current 20-Nanosecond Spark

Heinz Fischer and C. C. Gallagher
Appl. Opt. 6(12) 2176-2178 (1967)

Simple High Speed Kinematography of Nanosecond Exposure

Heinz Fischer and A. Fritzsche
Appl. Opt. 3(11) 1235-1237 (1964)

Turbulent Eddies in High Density Spark Channels in Helium

Heinz Fischer and Karlheinz Schönbach
Appl. Opt. 7(2) 311-314 (1968)

Measurement of Energy Flux Density Distribution in the Focus of an Arc Image Furnace

Rodney B. Beyer, Leonard McCulley, and Marjorie W. Evans
Appl. Opt. 3(1) 131-135 (1964)