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Electro-optically modulated polarizing Fourier-transform spectrometer for plasma spectroscopy applications

Howard, John

Description

A new electro-optically modulated optical solid-state (MOSS) interferometer has been constructed for measurement of quantities related to the low-order spectral moments of line emission from optically thin radiant media such as plasmas. When Doppler broadening is dominant, the spectral moments give the Radon transform of corresponding moments of the velocity distribution function of the radiating species. The instrument, which is based on the principle of the Fourier-transform spectrometer, has...[Show more]

dc.contributor.authorHoward, John
dc.date.accessioned2015-12-13T23:40:55Z
dc.identifier.issn0003-6935
dc.identifier.urihttp://hdl.handle.net/1885/94643
dc.description.abstractA new electro-optically modulated optical solid-state (MOSS) interferometer has been constructed for measurement of quantities related to the low-order spectral moments of line emission from optically thin radiant media such as plasmas. When Doppler broadening is dominant, the spectral moments give the Radon transform of corresponding moments of the velocity distribution function of the radiating species. The instrument, which is based on the principle of the Fourier-transform spectrometer, has high etendue and is rugged and compact. When electro-optical path-length modulation techniques are employed, the spectral information is encoded in the temporal frequency domain at harmonics of the modulation frequency and can be obtained by use of a single photodetector. Specifically, for a plasma in drifting local thermodynamic equilibrium the zeroth moment (brightness) is given by the average signal level, the first moment (shift) by the interferometric phase, and the second moment (linewidth) by the fringe visibility. To illustrate the MOSS performance, I present spectroscopic measurements of the time evolution of the plasma ion temperature and flow velocity for rf-heated discharges in the H-1 heliac, a toroidal plasma magnetic confinement at the Australian National University.
dc.publisherOptical Society of America
dc.sourceApplied Optics
dc.subjectKeywords: Modulated optical solid-state (MOSS) spectrometers; Fourier transforms; Light modulation; Photodetectors; Plasmas; Polarization; Radon; Spectrometry; Interferometers
dc.titleElectro-optically modulated polarizing Fourier-transform spectrometer for plasma spectroscopy applications
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume41
dc.date.issued2002
local.identifier.absfor020204 - Plasma Physics; Fusion Plasmas; Electrical Discharges
local.identifier.ariespublicationMigratedxPub24283
local.type.statusPublished Version
local.contributor.affiliationHoward, John, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage197
local.bibliographicCitation.lastpage208
dc.date.updated2015-12-12T09:30:37Z
local.identifier.scopusID2-s2.0-0036283007
CollectionsANU Research Publications

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