ON THE 'SATURATION' LUMINANCE OF HIGH-DENSITY MICROSECOND-ARC CHANNELS.
Abstract
The emission of high-current microsecond-arc channels with a 1-mm gap has been studied in argon and helium by means of a 20-nsec Kerr-cell shutter and profiles of the relative luminance B determined from photographs of the arc image. The method is practically unaffected by instabilities in arc position, and the accuracy of relative luminance values has been perfected to a scatter smaller than plus or minus 5%. From maximum values of the 'saturation' luminance B* in the axis of the arc channel observed over a wide range of arc current altered by the gas pressure, a ratio of B*He/B*A = 1.52 for the two gases has been determined. The luminance profile across the arc channel demonstrates increasing opacity after saturation is reached. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1966
- Accession Number
- AD0643515
Entities
People
- Heinz Fischer
- Lothar Michel
Organizations
- Air Force Cambridge Research Laboratories