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Title: Optical oxygen concentration monitor

Abstract

A system for measuring and monitoring the concentration of oxygen uses as a light source an argon discharge lamp, which inherently emits light with a spectral line that is close to one of oxygen`s A-band absorption lines. In a preferred embodiment, the argon line is split into sets of components of shorter and longer wavelengths by a magnetic field of approximately 2,000 Gauss that is parallel to the light propagation from the lamp. The longer wavelength components are centered on an absorption line of oxygen and thus readily absorbed, and the shorter wavelength components are moved away from that line and minimally absorbed. A polarization modulator alternately selects the set of the longer wavelength, or upshifted, components or the set of the shorter wavelength, or downshifted, components and passes the selected set to an environment of interest. After transmission over a path through that environment, the transmitted optical flux of the argon line varies as a result of the differential absorption. The system then determines the concentration of oxygen in the environment based on the changes in the transmitted optical flux between the two sets of components. In alternative embodiments modulation is achieved by selectively reversing the polarity of themore » magnetic field or by selectively supplying the magnetic field to either the emitting plasma of the lamp or the environment of interest. 4 figs.« less

Inventors:
Publication Date:
Research Org.:
Aerodyne Research, Inc
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
516940
Patent Number(s):
US 5,650,845/A/
Application Number:
PAN: 8-444,820
Assignee:
Aerodyne Research, Billerica, MA (United States) PTO; SCA: 440600; PA: EDB-97:120300; SN: 97001831603
DOE Contract Number:
FG02-93ER81522
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 22 Jul 1997
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MONITORS; OXYGEN; OPTICAL SYSTEMS; LIGHT SOURCES; MEASURING METHODS; DESIGN; ABSORPTION SPECTRA; CONCENTRATION RATIO

Citation Formats

Kebabian, P. Optical oxygen concentration monitor. United States: N. p., 1997. Web.
Kebabian, P. Optical oxygen concentration monitor. United States.
Kebabian, P. Tue . "Optical oxygen concentration monitor". United States. doi:.
@article{osti_516940,
title = {Optical oxygen concentration monitor},
author = {Kebabian, P.},
abstractNote = {A system for measuring and monitoring the concentration of oxygen uses as a light source an argon discharge lamp, which inherently emits light with a spectral line that is close to one of oxygen`s A-band absorption lines. In a preferred embodiment, the argon line is split into sets of components of shorter and longer wavelengths by a magnetic field of approximately 2,000 Gauss that is parallel to the light propagation from the lamp. The longer wavelength components are centered on an absorption line of oxygen and thus readily absorbed, and the shorter wavelength components are moved away from that line and minimally absorbed. A polarization modulator alternately selects the set of the longer wavelength, or upshifted, components or the set of the shorter wavelength, or downshifted, components and passes the selected set to an environment of interest. After transmission over a path through that environment, the transmitted optical flux of the argon line varies as a result of the differential absorption. The system then determines the concentration of oxygen in the environment based on the changes in the transmitted optical flux between the two sets of components. In alternative embodiments modulation is achieved by selectively reversing the polarity of the magnetic field or by selectively supplying the magnetic field to either the emitting plasma of the lamp or the environment of interest. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 22 00:00:00 EDT 1997},
month = {Tue Jul 22 00:00:00 EDT 1997}
}