Abstract

Time functions of the radiance (ITT FW-114, spectral response S–4) were observed, as well as the radiant intensity of high pressure spark channels in argon and helium with pressures between 1 atm and 40 atm, and a constant gap of 0.65 mm. The radiance, as well as radiant intensity, first increases exponentially with pressure and breakdown voltage; later, the radiance curves bend into a saturation plateau in both gases. On the other hand, the radiant intensity does not reach saturation, but shifts its maximum up to 50 nsec after the 8-nsec current maximum. The shift of the radiant intensity and saturation are related and result from the increasing opacity of the channel. The observed 1.65 ratio of the saturation radiances of helium and argon agrees with values reported in microsecond spark channels which have a diameter approximately six times wider.

© 1969 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
On the Saturation Luminance of High Density Microsecond Arc Channels

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

Turbulent Eddies in High Density Spark Channels in Helium

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

New Vacuum-Ultraviolet Emission Continua of Helium Produced in High-Pressure Discharges

R. E. Huffman, Y. Tanaka, and J. C. Larrabee
J. Opt. Soc. Am. 52(8) 851-857 (1962)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription