Accession Number : ADA182706

Title :   Laser Spectroscopy of Plasmas.

Descriptive Note : Annual rept. Dec 85-Dec 86,

Corporate Author : CALIFORNIA UNIV BERKELEY DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Daily,John W

PDF Url : ADA182706

Report Date : 15 May 1987

Pagination or Media Count : 17

Abstract : During the past year, work was initiated to develop novel advanced laser spectroscopy plasma diagnostic methods. The methods are based on observing the doppler shift in the absorption lines of ionic species. Two methods under study are Velocity Modulated Laser Spectroscopy and Two-Beam Doppler Shift Laser Spectroscopy. The scientific goal of the work is to increase understanding of plasmas by making in-situ measurements of ion drift velocities, concentrations and temperatures in a non-intrusive fashion. The scientific approach is to combine conventional laser spectroscopies with velocity detection. Using a method such as Rayleigh, fluorescence, or Raman scattering, one probes the Doppler profile of the species of interest, observing shifts in the Doppler profile that arise because of the presence of a electric field. The shift may be related to the ion mobility, and thus conductivity, if the electric field in known, or to the electric field if the mobility is known. Temperature and concentration may be recovered by the conventional means. Keywords: electric propulsion.

Descriptors :   *ABSORPTION SPECTRA, *LASER APPLICATIONS, *DOPPLER EFFECT, *PLASMA DIAGNOSTICS, *ELECTRIC PROPULSION, FLUORESCENCE, IONS, LASERS, LIGHT SCATTERING, LINE SPECTRA, MEASUREMENT, MOBILITY, MODULATION, PLASMAS(PHYSICS), RAMAN SPECTRA, SPECTROSCOPY, VELOCITY, FABRY PEROT INTERFEROMETERS, DRIFT, ELECTRIC FIELDS, SPECTRA, DETECTION

Subject Categories : Electric and Ion Propulsion
      Plasma Physics and Magnetohydrodynamics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE