Method for determining the concentration of atomic species in ga

Details Method for determining the concentration of atomic species in ga Method for determining the concentration of atomic species in ga

1995-10-23

1998-02-03

Evans, F. L.

G01J 3443, G01N 2163

Patent

active

057150532

ABSTRACT:
Method for determining the concentration of atomic species in gases and solids. Measurement of at least two emission intensities from a species in a sample that is excited by incident laser radiation. Which generates a plasma therein after a sufficient time period has elapsed and during a second time period, permits an instantaneous temperature to be established within the sample. The concentration of the atomic species to be determined is then derived from the known emission intensity of a predetermined concentration of that species in the sample at the measured temperature, a quantity which is measured prior to the determination of the unknown concentration, and the actual measured emission from the unknown species, or by this latter emission and the emission intensity of a species having known concentration within the sample such as nitrogen for gaseous air samples.

REFERENCES:
patent: 5446538 (1995-08-01), Noll
Lorenzen et al, "Applications of Laser-induced Emission Spectral Analysis for Industrial Process and Control", presented at the 1992 Winter Conference on Plasma Spectrochemistry, San Diego CA, Jan. 6-11, 1992.
Essien et al., J. Anal. Atomic Spectrometry, vol. 3, Oct. 1988, pp. 985-988.
Laser Focus, Feb. 1995, pp. 16 and 18.
Parigger et al., Applied Optics, vol. 34, No. 18, Jun. 20, 1995, pp. 3331-3335.
Parigger et al., J. Quant. Spectrosc. Radiat. Transfer, vol. 53, No. 3, 1995, pp. 249-255.
Wachter et al., Applied Spectroscopy, vol. 41, No. 6, 1987, pp. 1042-1048.
Wisburn et al., Analytical Chemistry, vol. 66, No. 18, Sep. 15, 1994, pp. 2964-2075.

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