Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Digital imaging technique for optical emission spectroscopy of a hydrogen arcjet plume

Not Accessible

Your library or personal account may give you access

Abstract

A digital imaging technique has been developed for optical emission spectroscopy measurements of a 1.6-kW hydrogen arcjet plume. Emissions from the Balmer α and β transitions of excited atomic hydrogen were measured with a computer-controlled red-green-blue color CCD detector with and without line-centered bandpass interference filters. A method for extending the effective dynamic range of the detector was developed, whereby images obtained with a wide range of exposure times are combined to form a single composite nonsaturated map of the plume emission structure. The line-of-sight measurements were deconvoluted to obtain the true radial intensity distribution with an inverse Abel transformation. Analysis of the inverted measurements indicates that the upper levels of the Balmer α and β transitions are not thermalized with the electrons in the plasma. The local thermodynamic equilibrium assumption fails for this plasma, and the electron temperature is not equivalent to the apparent excitation temperature obtained when a Boltzmann energy distribution is assumed for the atomic hydrogen excited states.

© 1995 Optical Society of America

Full Article  |  PDF Article
More Like This
Laser-induced fluorescence diagnostic for temperature and velocity measurements in a hydrogen arcjet plume

John G. Liebeskind, Ronald K. Hanson, and Mark A. Cappelli
Appl. Opt. 32(30) 6117-6127 (1993)

Stark broadening corrections to laser-induced fluorescence temperature measurements in a hydrogen arcjet plume

P. Victor Storm and Mark A. Cappelli
Appl. Opt. 35(24) 4913-4918 (1996)

Two-photon laser-induced fluorescence of atomic hydrogen in a diamond-depositing dc arcjet

Wolfgang Juchmann, Jorge Luque, and Jay B. Jeffries
Appl. Opt. 44(31) 6644-6652 (2005)

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 Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica 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 Optica member, or as an authorized user of your institution.

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

Figures (14)

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

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

Equations (17)

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

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

Metrics

Select as filters


Select Topics Cancel
© Copyright 2022 | Optica Publishing Group. All Rights Reserved