Apparatus and method for the spectrochemical analysis of liquids

Details Apparatus and method for the spectrochemical analysis of liquids Apparatus and method for the spectrochemical analysis of liquids

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).

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