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

Cremers, David A; Radziemski, Leon J; Loree, Thomas R

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

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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:

Cremers, David A ^[1]; Radziemski, Leon J ^[2]; Loree, Thomas R ^[1]

Los Alamos, NM
Las Cruces, NM

Issue Date:: 1990-01-01

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

OSTI Identifier:: 867376

Patent Number(s):: 4925307

Assignee:: United States of America as represented by United States (Washington, DC)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01J - MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01J - MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT
G01J3/443 - Emission spectrometry

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/63 - optically excited
G01N21/718 - {Laser microanalysis, i.e. with formation of sample plasma}

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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.

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                    Cremers, David A, Radziemski, Leon J, & Loree, Thomas R. Apparatus and method for the spectrochemical analysis of liquids using the laser spark.  United States.

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                    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.

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@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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