Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1984-05-01
1990-05-15
Rosenberger, R. A.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
356319, G01J 300
Patent
active
049253077
ABSTRACT:
A method and apparatus for the qualitative and quantitative spectroscopic investigation of elements present in a liquid sample using the laser spark. A series of temporally closely spaced spark pairs is induced in the liquid sample utilizing pulsed electromagnetic radiation from a pair of lasers. The light pulses are not significantly absorbed by the sample so that the sparks occur inside of the liquid. The emitted light from the breakdown events is spectrally and temporally resolved, and the time period between the two laser pulses in each spark pair is adjusted to maximize the signal-to-noise ratio of the emitted signals. In comparison with the single pulse technique, a substantial reduction in the limits of detectability for many elements has been demonstrated. Narrowing of spectral features results in improved discrimination against interfering species.
REFERENCES:
Prepmeier et al, "Q-Switched Laser Energy Absorption in the Plume of an Aluminum Aloy," Analyt. Chem. 41,700 (1969).
Hargis et al, "Multifrequency Laser Breakdown in SF.sub.6," an abstract of a talk, 35th Annual Gaseous Elec. Conf., Oct. 19-22, 1982.
Cremers et al, "Direct Detection of Contaminants in Liquids via Laser Induced Breakdown Spectroscopy," 24th Rocky Mountain Conference, Denver, Colorado, Aug. 1-15, 1982 (published Jul. 15, 1982).
Cremers David A.
Loree Thomas R.
Radziemski Leon J.
Freund Samuel M.
Hightower Judson R.
Rosenberger R. A.
The United States of America as represented by the United States
Wilson Ray G.
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