Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1997-03-12
1998-01-06
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01J 330
Patent
active
057060827
ABSTRACT:
In an optogalvanic spectroscopy system, a plasma is exposed to light at a wavelength associated with a particular species in the analyte. The light is amplitude modulated. The amplitude of a modulated component in the signal representing electrical impedance of the plasma is detected in a phase independent manner, so that the detected amplitude is substantially independent of the phase of the modulated component in the impedance signal relative to the amplitude modulation of the light. The system has reduced sensitivity to changes in the spectrum of the applied light.
REFERENCES:
patent: 5394236 (1995-02-01), Murnick
patent: 5448196 (1995-09-01), Kanbara et al.
Randy D. May and Paul H. May, "Solid-state radio frequency oscillator for optogalvanic spectroscopy: Detection of nitride oxide using the 2-0 overtone transition," pp. 2242-2245, Rev. Sci. Instrum. vol. 57 No. 9, Sep. 1986, .COPYRGT.1986 American Institute of Physics.
D.E. Murnick, M.J. Colgan and F.A. Moscatelli, "Optogalvanic signals from argon metastables in a rf glow discharge," pp. 792-794, Appl. Phys. Lett. vol. 54, No. 9, Feb. 1989, .COPYRGT.1989 American Institute of Physics.
Colgan Michael J.
Lie Hans P.
Alimenterics Inc.
Evans F. L.
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