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Title: Apparatus and method for the spectrochemical analysis of liquids using the laser spark

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.

Inventors:
 [1];  [2];  [1]
  1. (Los Alamos, NM)
  2. (Las Cruces, NM)
Issue Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
867376
Patent Number(s):
4925307
Assignee:
United States of America as represented by United States (Washington, DC) LANL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; method; spectrochemical; analysis; liquids; laser; spark; qualitative; quantitative; spectroscopic; investigation; elements; liquid; sample; series; temporally; closely; spaced; pairs; induced; utilizing; pulsed; electromagnetic; radiation; pair; lasers; light; pulses; significantly; absorbed; sparks; occur; inside; emitted; breakdown; events; spectrally; resolved; time; period; adjusted; maximize; signal-to-noise; ratio; signals; comparison; single; pulse; technique; substantial; reduction; limits; detectability; demonstrated; narrowing; spectral; features; results; improved; discrimination; interfering; species; liquid sample; laser spark; spectral features; chemical analysis; signal-to-noise ratio; laser pulses; light pulses; electromagnetic radiation; laser pulse; time period; closely spaced; emitted light; light pulse; single pulse; substantial reduction; noise ratio; pulse technique; sample utilizing; spectroscopic investigation; quantitative spectroscopic; utilizing pulsed; emitted signal; /356/

Citation Formats

Cremers, David A., Radziemski, Leon J., and Loree, Thomas R. Apparatus and method for the spectrochemical analysis of liquids using the laser spark. United States: N. p., 1990. Web.
Cremers, David A., Radziemski, Leon J., & Loree, Thomas R. Apparatus and method for the spectrochemical analysis of liquids using the laser spark. United States.
Cremers, David A., Radziemski, Leon J., and Loree, Thomas R. Mon . "Apparatus and method for the spectrochemical analysis of liquids using the laser spark". United States. https://www.osti.gov/servlets/purl/867376.
@article{osti_867376,
title = {Apparatus and method for the spectrochemical analysis of liquids using the laser spark},
author = {Cremers, David A. and Radziemski, Leon J. and Loree, Thomas R.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

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