Oxygen analysis employing absorption spectroscopy

Details Oxygen analysis employing absorption spectroscopy Oxygen analysis employing absorption spectroscopy

1984-10-10

1986-05-27

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

G01J 142

Patent

active

045917213

ABSTRACT:
A method and apparatus are described for detecting the presence and amount of elemental oxygen in a sample cell. The intensity of extreme ultraviolet light passing through the sample cell at a wavelength band overlapping at least one of the Schumann-Runge absorption lines of oxygen is detected and compared with a predetermined non-absorbed condition of the ultraviolet light. The non-absorbed condition may be achieved by narrowing the wavelength band such that the band does not overlap the Schumann-Runge absorption line, or may be achieved by detecting the ultraviolet light passing through a reference cell. Also described is a novel ultraviolet source in which a cold zone captures neutral atoms of the emission gas to reduce the affect of resonance absorption of emitted ultraviolet light by such neutral atoms.

REFERENCES:
patent: 3449565 (1969-06-01), Barringer
patent: 4096388 (1978-06-01), Wong
patent: 4192996 (1980-03-01), Kronick et al.
"Pen-Ray Lamps . . . Ultraviolet Sources for Research and Industry," 1977, by Ultra-Violet Products, Inc., pp. 1-11.

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