Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1993-03-24
1995-05-02
Limanek, Robert P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
356311, 356417, G01J 330
Patent
active
054124670
ABSTRACT:
A gas emission spectrometer and method for analyzing a continuously flowing gas stream using gas emission spectroscopy to measure low concentration levels of one or more gas/vapor impurities in the gas stream. Alternating power is applied to an electric discharge source to generate emissive radiation which is filtered into an optical signal at the emission wavelength of a preselected impurity gas. The optical signal is converted into an electrical signal which is selectively amplified within a narrow frequency range centered at substantially twice the excitation frequency of the alternating power source. The impurity concentration is measured from the amplified signal upon rectification.
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"Emission Spectrometric Method And Analyzer For Traces of Nitrogen in Argon", Analytical Chemistry, vol. 34, No. 10, Sep. 1962, pp. 1254-1260, Fay, Homer, Mohr, Paul H. And Cook, Gerhard A.
Brown David E.
Demmin Hollis C.
Malczewski Mark L.
Wiltse Donald R.
Hardy David B.
Limanek Robert P.
O'Brien Cornelius F.
Praxair Technology Inc.
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