Abstract

A novel method of determining both the Doppler and Stark shifts in a single measurement of spectral lines emitted by the arc-heated flow from a plasma jet has been successfully demonstrated. The method uses a spherical mirror arranged with its optical axis coincident with the optical axis of a Fabry-Perot interferometer and with its center of curvature at the center line of the flow. The common optical axis lies at an angle to the flow. With this system, both red- and blue-shifted line profiles are recorded in the same spectral scan. If conditions are such that the red- and blue-shifted profiles are not resolvable, the blue-shifted component is chopped so that the recorded signal consists of the envelopes of both the red-shifted profile and the superimposed red- and blue-shifted profiles. The wavelength difference between the blue- and red-shifted line profiles is exactly twice the Doppler shift integrated along a line of sight through the flow and is independent of a Stark shift. The Stark shift is given by the wavelength difference between the absolute line center and the midpoint of the red- and blue-shifted lines. Abel inversion of integrated line shift data has yielded radial velocity profiles to an accuracy of ±3% in a supersonic, arc-heated argon flow.

© 1972 Optical Society of America

Full Article  |  PDF Article
Related Articles
Plasma-rotation determination from spectral intensity measurements

R. S. Shaw
J. Opt. Soc. Am. A 4(12) 2254-2259 (1987)

Doppler-shifted line profiles from spherically expanding plasmas

J. C. Moreno, S. Goldsmith, and H. R. Griem
J. Opt. Soc. Am. B 9(3) 339-343 (1992)

The Use of an Analog Computer in Side-On Arc Spectroscopy

J. B. Shumaker and C. R. Yokley
Appl. Opt. 3(1) 83-87 (1964)

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

Tables (1)

You do not have subscription access to this journal. Article tables 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

Equations (7)

You do not have subscription access to this journal. Equations 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